def plot_ec(label):
ainvs = db.ec_curves.lookup(label, 'ainvs', 'lmfdb_label')
if ainvs is None:
return elliptic_curve_jump_error(label, {})
E = EllipticCurve(ainvs)
P = E.plot()
_, filename = tempfile.mkstemp('.png')
P.save(filename)
data = open(filename).read()
os.unlink(filename)
response = make_response(data)
response.headers['Content-type'] = 'image/png'
return response
def plot_ec(label):
ainvs = db.ec_curves.lookup(label, 'ainvs', 'lmfdb_label')
if ainvs is None:
return elliptic_curve_jump_error(label, {})
E = EllipticCurve(ainvs)
P = E.plot()
_, filename = tempfile.mkstemp('.png')
P.save(filename)
data = open(filename).read()
os.unlink(filename)
response = make_response(data)
response.headers['Content-type'] = 'image/png'
return response
def plot_ec(label):
CDB = db_ec()
data = CDB.find_one({'lmfdb_label': label})
if data is None:
return elliptic_curve_jump_error(label, {})
E = EllipticCurve(parse_ainvs(data['xainvs']))
P = E.plot()
_, filename = tempfile.mkstemp('.png')
P.save(filename)
data = open(filename).read()
os.unlink(filename)
response = make_response(data)
response.headers['Content-type'] = 'image/png'
return response
def plot_ec(label):
CDB = db_ec()
data = CDB.find_one({'lmfdb_label': label})
if data is None:
return elliptic_curve_jump_error(label, {})
E = EllipticCurve(parse_ainvs(data['xainvs']))
P = E.plot()
_, filename = tempfile.mkstemp('.png')
P.save(filename)
data = open(filename).read()
os.unlink(filename)
response = make_response(data)
response.headers['Content-type'] = 'image/png'
return response
def plot_ec(label):
C = lmfdb.base.getDBConnection()
data = C.elliptic_curves.curves.find_one({'lmfdb_label': label})
if data is None:
return elliptic_curve_jump_error(label, {})
ainvs = [int(a) for a in data['ainvs']]
E = EllipticCurve(ainvs)
P = E.plot()
_, filename = tempfile.mkstemp('.png')
P.save(filename)
data = open(filename).read()
os.unlink(filename)
response = make_response(data)
response.headers['Content-type'] = 'image/png'
return response
def plot_ec(label):
C = lmfdb.base.getDBConnection()
data = C.elliptic_curves.curves.find_one({'lmfdb_label': label})
if data is None:
return elliptic_curve_jump_error(label, {})
ainvs = [int(a) for a in data['ainvs']]
E = EllipticCurve(ainvs)
P = E.plot()
_, filename = tempfile.mkstemp('.png')
P.save(filename)
data = open(filename).read()
os.unlink(filename)
response = make_response(data)
response.headers['Content-type'] = 'image/png'
return response
class WebEC(object):
"""
Class for an elliptic curve over Q
"""
def __init__(self, dbdata):
"""
Arguments:
- dbdata: the data from the database
"""
logger.debug("Constructing an instance of ECisog_class")
self.__dict__.update(dbdata)
# Next lines because the hyphens make trouble
self.xintcoords = parse_list(dbdata['x-coordinates_of_integral_points'])
self.non_surjective_primes = dbdata['non-surjective_primes']
# Next lines because the python identifiers cannot start with 2
self.twoadic_index = dbdata['2adic_index']
self.twoadic_log_level = dbdata['2adic_log_level']
self.twoadic_gens = dbdata['2adic_gens']
self.twoadic_label = dbdata['2adic_label']
# All other fields are handled here
self.make_curve()
@staticmethod
def by_label(label):
"""
Searches for a specific elliptic curve in the curves
collection by its label, which can be either in LMFDB or
Cremona format.
"""
try:
N, iso, number = split_lmfdb_label(label)
data = db_ec().find_one({"lmfdb_label" : label})
except AttributeError:
try:
N, iso, number = split_cremona_label(label)
data = db_ec().find_one({"label" : label})
except AttributeError:
return "Invalid label" # caller must catch this and raise an error
if data:
return WebEC(data)
return "Curve not found" # caller must catch this and raise an error
def make_curve(self):
# To start with the data fields of self are just those from
# the database. We need to reformat these, construct the
# actual elliptic curve E, and compute some further (easy)
# data about it.
#
# Weierstrass equation
data = self.data = {}
data['ainvs'] = [int(ai) for ai in self.ainvs]
self.E = EllipticCurve(data['ainvs'])
data['equation'] = web_latex(self.E)
# conductor, j-invariant and discriminant
data['conductor'] = N = ZZ(self.conductor)
bad_primes = N.prime_factors()
try:
data['j_invariant'] = QQ(str(self.jinv))
except KeyError:
data['j_invariant'] = self.E.j_invariant()
data['j_inv_factor'] = latex(0)
if data['j_invariant']:
data['j_inv_factor'] = latex(data['j_invariant'].factor())
data['j_inv_str'] = unicode(str(data['j_invariant']))
data['j_inv_latex'] = web_latex(data['j_invariant'])
data['disc'] = D = self.E.discriminant()
data['disc_latex'] = web_latex(data['disc'])
data['disc_factor'] = latex(data['disc'].factor())
data['cond_factor'] =latex(N.factor())
data['cond_latex'] = web_latex(N)
# CM and endomorphism ring
data['CMD'] = self.cm
data['CM'] = "no"
data['EndE'] = "\(\Z\)"
if self.cm:
data['CM'] = "yes (\(D=%s\))" % data['CMD']
if data['CMD']%4==0:
d4 = ZZ(data['CMD'])//4
data['EndE'] = "\(\Z[\sqrt{%s}]\)" % d4
else:
data['EndE'] = "\(\Z[(1+\sqrt{%s})/2]\)" % data['CMD']
# modular degree
try:
data['degree'] = self.degree
except AttributeError:
try:
data['degree'] = self.E.modular_degree()
except RuntimeError:
data['degree'] # invalid, but will be displayed nicely
# Minimal quadratic twist
E_pari = self.E.pari_curve()
from sage.libs.pari.all import PariError
try:
minq, minqD = self.E.minimal_quadratic_twist()
except PariError: # this does occur with 164411a1
ec.debug("PariError computing minimal quadratic twist of elliptic curve %s" % lmfdb_label)
minq = self.E
minqD = 1
data['minq_D'] = minqD
if self.E == minq:
data['minq_label'] = self.lmfdb_label
data['minq_info'] = '(itself)'
else:
minq_ainvs = [str(c) for c in minq.ainvs()]
data['minq_label'] = db_ec().find_one({'ainvs': minq_ainvs})['lmfdb_label']
data['minq_info'] = '(by %s)' % minqD
minq_N, minq_iso, minq_number = split_lmfdb_label(data['minq_label'])
# rational and integral points
mw = self.mw = {}
xintpoints_projective = [self.E.lift_x(x) for x in self.xintcoords]
xintpoints = [P.xy() for P in xintpoints_projective]
mw['int_points'] = ', '.join(web_latex(P) for P in xintpoints)
# Generators of infinite order
mw['rank'] = self.rank
try:
self.generators = [self.E(g) for g in parse_points(self.gens)]
mw['generators'] = [web_latex(P.xy()) for P in self.generators]
mw['heights'] = [P.height() for P in self.generators]
except AttributeError:
mw['generators'] = ''
mw['heights'] = []
# Torsion subgroup: order, structure, generators
mw['tor_order'] = self.torsion
tor_struct = [int(c) for c in self.torsion_structure]
if mw['tor_order'] == 1:
mw['tor_struct'] = '\mathrm{Trivial}'
mw['tor_gens'] = ''
else:
mw['tor_struct'] = ' \\times '.join(['\Z/{%s}\Z' % n
for n in tor_struct])
mw['tor_gens'] = ', '.join(web_latex(self.E(g).xy()) for g in parse_points(self.torsion_generators))
# Images of Galois representations
try:
data['galois_images'] = [trim_galois_image_code(s) for s in self.galois_images]
data['non_surjective_primes'] = self.non_surjective_primes
except AttributeError:
#print "No Galois image data"
data['galois_images'] = []
data['non_surjective_primes'] = []
data['galois_data'] = [{'p': p,'image': im }
for p,im in zip(data['non_surjective_primes'],
data['galois_images'])]
if self.twoadic_gens:
from sage.matrix.all import Matrix
data['twoadic_gen_matrices'] = ','.join([latex(Matrix(2,2,M)) for M in self.twoadic_gens])
data['twoadic_rouse_url'] = ROUSE_URL_PREFIX + self.twoadic_label + ".html"
# Leading term of L-function & BSD data
bsd = self.bsd = {}
r = self.rank
if r >= 2:
bsd['lder_name'] = "L^{(%s)}(E,1)/%s!" % (r,r)
elif r:
bsd['lder_name'] = "L'(E,1)"
else:
bsd['lder_name'] = "L(E,1)"
bsd['reg'] = self.regulator
bsd['omega'] = self.real_period
bsd['sha'] = int(0.1+self.sha_an)
bsd['lder'] = self.special_value
# Optimality (the optimal curve in the class is the curve
# whose Cremona label ends in '1' except for '990h' which was
# labelled wrongly long ago)
if self.iso == '990h':
data['Gamma0optimal'] = bool(self.number == 3)
else:
data['Gamma0optimal'] = bool(self.number == 1)
data['p_adic_data_exists'] = False
if data['Gamma0optimal']:
data['p_adic_data_exists'] = (padic_db().find({'lmfdb_iso': self.lmfdb_iso}).count()) > 0
data['p_adic_primes'] = [p for p in sage.all.prime_range(5, 100)
if self.E.is_ordinary(p) and not p.divides(N)]
# Local data
local_data = self.local_data = []
# if we use E.tamagawa_numbers() it calls E.local_data(p) which
# used to crash on some curves e.g. 164411a1
tamagawa_numbers = []
for p in bad_primes:
local_info = self.E.local_data(p, algorithm="generic")
local_data_p = {}
local_data_p['p'] = p
local_data_p['tamagawa_number'] = local_info.tamagawa_number()
tamagawa_numbers.append(ZZ(local_info.tamagawa_number()))
local_data_p['kodaira_symbol'] = web_latex(local_info.kodaira_symbol()).replace('$', '')
local_data_p['reduction_type'] = local_info.bad_reduction_type()
local_data_p['ord_cond'] = local_info.conductor_valuation()
local_data_p['ord_disc'] = local_info.discriminant_valuation()
local_data_p['ord_den_j'] = max(0,-self.E.j_invariant().valuation(p))
local_data.append(local_data_p)
if len(bad_primes)>1:
bsd['tamagawa_factors'] = r' \cdot '.join(str(c.factor()) for c in tamagawa_numbers)
else:
bsd['tamagawa_factors'] = ''
bsd['tamagawa_product'] = sage.misc.all.prod(tamagawa_numbers)
cond, iso, num = split_lmfdb_label(self.lmfdb_label)
data['newform'] = web_latex(self.E.q_eigenform(10))
self.make_code_snippets()
self.friends = [
('Isogeny class ' + self.lmfdb_iso, url_for(".by_double_iso_label", conductor=N, iso_label=iso)),
('Minimal quadratic twist %s %s' % (data['minq_info'], data['minq_label']), url_for(".by_triple_label", conductor=minq_N, iso_label=minq_iso, number=minq_number)),
('All twists ', url_for(".rational_elliptic_curves", jinv=self.jinv)),
('L-function', url_for("l_functions.l_function_ec_page", label=self.lmfdb_label)),
('Symmetric square L-function', url_for("l_functions.l_function_ec_sym_page", power='2', label=self.lmfdb_iso)),
('Symmetric 4th power L-function', url_for("l_functions.l_function_ec_sym_page", power='4', label=self.lmfdb_iso)),
('Modular form ' + self.lmfdb_iso.replace('.', '.2'), url_for("emf.render_elliptic_modular_forms", level=int(N), weight=2, character=0, label=iso))]
self.downloads = [('Download coeffients of q-expansion', url_for(".download_EC_qexp", label=self.lmfdb_label, limit=100)),
('Download all stored data', url_for(".download_EC_all", label=self.lmfdb_label))]
self.plot = encode_plot(self.E.plot())
self.plot_link = '<img src="%s" width="200" height="150"/>' % self.plot
self.properties = [('Label', self.lmfdb_label),
(None, self.plot_link),
('Conductor', '\(%s\)' % data['conductor']),
('Discriminant', '\(%s\)' % data['disc']),
('j-invariant', '%s' % data['j_inv_latex']),
('CM', '%s' % data['CM']),
('Rank', '\(%s\)' % mw['rank']),
('Torsion Structure', '\(%s\)' % mw['tor_struct'])
]
self.title = "Elliptic Curve %s (Cremona label %s)" % (self.lmfdb_label, self.label)
self.bread = [('Elliptic Curves', url_for("ecnf.index")),
('$\Q$', url_for(".rational_elliptic_curves")),
('%s' % N, url_for(".by_conductor", conductor=N)),
('%s' % iso, url_for(".by_double_iso_label", conductor=N, iso_label=iso)),
('%s' % num,' ')]
def make_code_snippets(self):
# read in code.yaml from current directory:
_curdir = os.path.dirname(os.path.abspath(__file__))
self.code = yaml.load(open(os.path.join(_curdir, "code.yaml")))
# Fill in placeholders for this specific curve:
for lang in ['sage', 'pari', 'magma']:
self.code['curve'][lang] = self.code['curve'][lang] % (self.data['ainvs'],self.label)
for k in self.code:
if k != 'prompt':
for lang in self.code[k]:
self.code[k][lang] = self.code[k][lang].split("\n")
# remove final empty line
if len(self.code[k][lang][-1])==0:
self.code[k][lang] = self.code[k][lang][:-1]
class WebEC(object):
"""
Class for an elliptic curve over Q
"""
def __init__(self, dbdata):
"""
Arguments:
- dbdata: the data from the database
"""
logger.debug("Constructing an instance of WebEC")
self.__dict__.update(dbdata)
# Next lines because the hyphens make trouble
self.xintcoords = split_list(
dbdata['x-coordinates_of_integral_points'])
self.non_surjective_primes = dbdata['non-surjective_primes']
# Next lines because the python identifiers cannot start with 2
self.twoadic_index = dbdata['2adic_index']
self.twoadic_log_level = dbdata['2adic_log_level']
self.twoadic_gens = dbdata['2adic_gens']
self.twoadic_label = dbdata['2adic_label']
# All other fields are handled here
self.make_curve()
@staticmethod
def by_label(label):
"""
Searches for a specific elliptic curve in the curves
collection by its label, which can be either in LMFDB or
Cremona format.
"""
try:
N, iso, number = split_lmfdb_label(label)
data = db_ec().find_one({"lmfdb_label": label})
except AttributeError:
try:
N, iso, number = split_cremona_label(label)
data = db_ec().find_one({"label": label})
except AttributeError:
return "Invalid label" # caller must catch this and raise an error
if data:
return WebEC(data)
return "Curve not found" # caller must catch this and raise an error
def make_curve(self):
# To start with the data fields of self are just those from
# the database. We need to reformat these.
# Old version: required constructing the actual elliptic curve
# E, and computing some further data about it.
# New version (May 2016): extra data fields now in the
# database so we do not have to construct the curve or do any
# computation with it on the fly. As a failsafe the old way
# is still included.
data = self.data = {}
try:
data['ainvs'] = [int(c) for c in self.xainvs[1:-1].split(',')]
except AttributeError:
data['ainvs'] = [int(ai) for ai in self.ainvs]
data['conductor'] = N = ZZ(self.conductor)
data['j_invariant'] = QQ(str(self.jinv))
data['j_inv_factor'] = latex(0)
if data['j_invariant']: # don't factor 0
data['j_inv_factor'] = latex(data['j_invariant'].factor())
data['j_inv_str'] = unicode(str(data['j_invariant']))
data['j_inv_latex'] = web_latex(data['j_invariant'])
mw = self.mw = {}
mw['rank'] = self.rank
mw['int_points'] = ''
if self.xintcoords:
a1, a2, a3, a4, a6 = [ZZ(a) for a in data['ainvs']]
def lift_x(x):
f = ((x + a2) * x + a4) * x + a6
b = (a1 * x + a3)
d = (b * b + 4 * f).sqrt()
return (x, (-b + d) / 2)
mw['int_points'] = ', '.join(
web_latex(lift_x(x)) for x in self.xintcoords)
mw['generators'] = ''
mw['heights'] = []
if self.gens:
mw['generators'] = [
web_latex(tuple(P)) for P in parse_points(self.gens)
]
mw['tor_order'] = self.torsion
tor_struct = [int(c) for c in self.torsion_structure]
if mw['tor_order'] == 1:
mw['tor_struct'] = '\mathrm{Trivial}'
mw['tor_gens'] = ''
else:
mw['tor_struct'] = ' \\times '.join(
['\Z/{%s}\Z' % n for n in tor_struct])
mw['tor_gens'] = ', '.join(
web_latex(tuple(P))
for P in parse_points(self.torsion_generators))
# try to get all the data we need from the database entry (now in self)
try:
data['equation'] = self.equation
local_data = self.local_data
D = self.signD * prod(
[ld['p']**ld['ord_disc'] for ld in local_data])
data['disc'] = D
Nfac = Factorization([(ZZ(ld['p']), ld['ord_cond'])
for ld in local_data])
Dfac = Factorization([(ZZ(ld['p']), ld['ord_disc'])
for ld in local_data],
unit=ZZ(self.signD))
data['minq_D'] = minqD = self.min_quad_twist['disc']
minq_label = self.min_quad_twist['label']
data['minq_label'] = db_ec().find_one(
{'label': minq_label}, ['lmfdb_label'])['lmfdb_label']
data['minq_info'] = '(itself)' if minqD == 1 else '(by %s)' % minqD
try:
data['degree'] = self.degree
except AttributeError:
data['degree'] = 0 # invalid, but will be displayed nicely
mw['heights'] = self.heights
if self.number == 1:
data['an'] = self.anlist
data['ap'] = self.aplist
else:
r = db_ec().find_one({
'lmfdb_iso': self.lmfdb_iso,
'number': 1
}, ['anlist', 'aplist'])
data['an'] = r['anlist']
data['ap'] = r['aplist']
# otherwise fall back to computing it from the curve
except AttributeError:
print("Falling back to constructing E")
self.E = EllipticCurve(data['ainvs'])
data['equation'] = web_latex(self.E)
data['disc'] = D = self.E.discriminant()
Nfac = N.factor()
Dfac = D.factor()
bad_primes = [p for p, e in Nfac]
try:
data['degree'] = self.degree
except AttributeError:
try:
data['degree'] = self.E.modular_degree()
except RuntimeError:
data['degree'] = 0 # invalid, but will be displayed nicely
minq, minqD = self.E.minimal_quadratic_twist()
data['minq_D'] = minqD
if minqD == 1:
data['minq_label'] = self.lmfdb_label
data['minq_info'] = '(itself)'
else:
# This relies on the minimal twist being in the
# database, which is true when the database only
# contains the Cremona database. It would be a good
# idea if, when the database is extended, we ensured
# that for any curve included, all twists of smaller
# conductor are also included.
minq_ainvs = [str(c) for c in minq.ainvs()]
data['minq_label'] = db_ec().find_one(
{
'jinv': str(self.E.j_invariant()),
'ainvs': minq_ainvs
}, ['lmfdb_label'])['lmfdb_label']
data['minq_info'] = '(by %s)' % minqD
if self.gens:
self.generators = [self.E(g) for g in parse_points(self.gens)]
mw['heights'] = [P.height() for P in self.generators]
data['an'] = self.E.anlist(20, python_ints=True)
data['ap'] = self.E.aplist(100, python_ints=True)
self.local_data = local_data = []
for p in bad_primes:
ld = self.E.local_data(p, algorithm="generic")
local_data_p = {}
local_data_p['p'] = p
local_data_p['cp'] = ld.tamagawa_number()
local_data_p['kod'] = web_latex(ld.kodaira_symbol()).replace(
'$', '')
local_data_p['red'] = ld.bad_reduction_type()
rootno = -ld.bad_reduction_type()
if rootno == 0:
rootno = self.E.root_number(p)
local_data_p['rootno'] = rootno
local_data_p['ord_cond'] = ld.conductor_valuation()
local_data_p['ord_disc'] = ld.discriminant_valuation()
local_data_p['ord_den_j'] = max(
0, -self.E.j_invariant().valuation(p))
local_data.append(local_data_p)
# If we got the data from the database, the root numbers may
# not have been stored there, so we have to compute them. If
# there are additive primes this means constructing the curve.
for ld in self.local_data:
if not 'rootno' in ld:
rootno = -ld['red']
if rootno == 0:
try:
E = self.E
except AttributeError:
self.E = E = EllipticCurve(data['ainvs'])
rootno = E.root_number(ld['p'])
ld['rootno'] = rootno
minq_N, minq_iso, minq_number = split_lmfdb_label(data['minq_label'])
data['disc_factor'] = latex(Dfac)
data['cond_factor'] = latex(Nfac)
data['disc_latex'] = web_latex(D)
data['cond_latex'] = web_latex(N)
data['CMD'] = self.cm
data['CM'] = "no"
data['EndE'] = "\(\Z\)"
if self.cm:
data['CM'] = "yes (\(D=%s\))" % data['CMD']
if data['CMD'] % 4 == 0:
d4 = ZZ(data['CMD']) // 4
data['EndE'] = "\(\Z[\sqrt{%s}]\)" % d4
else:
data['EndE'] = "\(\Z[(1+\sqrt{%s})/2]\)" % data['CMD']
data['ST'] = st_link_by_name(1, 2, 'N(U(1))')
else:
data['ST'] = st_link_by_name(1, 2, 'SU(2)')
data['p_adic_primes'] = [
p for i, p in enumerate(prime_range(5, 100))
if (N * data['ap'][i]) % p != 0
]
try:
data['galois_images'] = [
trim_galois_image_code(s) for s in self.galois_images
]
data['non_surjective_primes'] = self.non_surjective_primes
except AttributeError:
#print "No Galois image data"
data['galois_images'] = []
data['non_surjective_primes'] = []
data['galois_data'] = [{
'p': p,
'image': im
} for p, im in zip(data['non_surjective_primes'],
data['galois_images'])]
cond, iso, num = split_lmfdb_label(self.lmfdb_label)
self.class_url = url_for(".by_double_iso_label",
conductor=N,
iso_label=iso)
self.ncurves = db_ec().count({'lmfdb_iso': self.lmfdb_iso})
isodegs = [str(d) for d in self.isogeny_degrees if d > 1]
if len(isodegs) < 3:
data['isogeny_degrees'] = " and ".join(isodegs)
else:
data['isogeny_degrees'] = " and ".join(
[", ".join(isodegs[:-1]), isodegs[-1]])
if self.twoadic_gens:
from sage.matrix.all import Matrix
data['twoadic_gen_matrices'] = ','.join(
[latex(Matrix(2, 2, M)) for M in self.twoadic_gens])
data[
'twoadic_rouse_url'] = ROUSE_URL_PREFIX + self.twoadic_label + ".html"
# Leading term of L-function & BSD data
bsd = self.bsd = {}
r = self.rank
if r >= 2:
bsd['lder_name'] = "L^{(%s)}(E,1)/%s!" % (r, r)
elif r:
bsd['lder_name'] = "L'(E,1)"
else:
bsd['lder_name'] = "L(E,1)"
bsd['reg'] = self.regulator
bsd['omega'] = self.real_period
bsd['sha'] = int(0.1 + self.sha_an)
bsd['lder'] = self.special_value
# Optimality (the optimal curve in the class is the curve
# whose Cremona label ends in '1' except for '990h' which was
# labelled wrongly long ago)
if self.iso == '990h':
data['Gamma0optimal'] = bool(self.number == 3)
else:
data['Gamma0optimal'] = bool(self.number == 1)
data['p_adic_data_exists'] = False
if data['Gamma0optimal']:
data['p_adic_data_exists'] = (padic_db().find({
'lmfdb_iso':
self.lmfdb_iso
}).count()) > 0
tamagawa_numbers = [ZZ(ld['cp']) for ld in local_data]
cp_fac = [cp.factor() for cp in tamagawa_numbers]
cp_fac = [
latex(cp) if len(cp) < 2 else '(' + latex(cp) + ')'
for cp in cp_fac
]
bsd['tamagawa_factors'] = r'\cdot'.join(cp_fac)
bsd['tamagawa_product'] = prod(tamagawa_numbers)
data['newform'] = web_latex(
PowerSeriesRing(QQ, 'q')(data['an'], 20, check=True))
data['newform_label'] = self.newform_label = newform_label(
cond, 2, 1, iso)
self.newform_link = url_for("emf.render_elliptic_modular_forms",
level=cond,
weight=2,
character=1,
label=iso)
self.newform_exists_in_db = is_newform_in_db(self.newform_label)
self._code = None
self.class_url = url_for(".by_double_iso_label",
conductor=N,
iso_label=iso)
self.friends = [('Isogeny class ' + self.lmfdb_iso, self.class_url),
('Minimal quadratic twist %s %s' %
(data['minq_info'], data['minq_label']),
url_for(".by_triple_label",
conductor=minq_N,
iso_label=minq_iso,
number=minq_number)),
('All twists ',
url_for(".rational_elliptic_curves", jinv=self.jinv)),
('L-function',
url_for("l_functions.l_function_ec_page",
label=self.lmfdb_label))]
if not self.cm:
if N <= 300:
self.friends += [('Symmetric square L-function',
url_for("l_functions.l_function_ec_sym_page",
power='2',
label=self.lmfdb_iso))]
if N <= 50:
self.friends += [('Symmetric cube L-function',
url_for("l_functions.l_function_ec_sym_page",
power='3',
label=self.lmfdb_iso))]
if self.newform_exists_in_db:
self.friends += [('Modular form ' + self.newform_label,
self.newform_link)]
self.downloads = [('Download coefficients of q-expansion',
url_for(".download_EC_qexp",
label=self.lmfdb_label,
limit=1000)),
('Download all stored data',
url_for(".download_EC_all",
label=self.lmfdb_label)),
('Download Magma code',
url_for(".ec_code_download",
conductor=cond,
iso=iso,
number=num,
label=self.lmfdb_label,
download_type='magma')),
('Download Sage code',
url_for(".ec_code_download",
conductor=cond,
iso=iso,
number=num,
label=self.lmfdb_label,
download_type='sage')),
('Download GP code',
url_for(".ec_code_download",
conductor=cond,
iso=iso,
number=num,
label=self.lmfdb_label,
download_type='gp'))]
try:
self.plot = encode_plot(self.E.plot())
except AttributeError:
self.plot = encode_plot(EllipticCurve(data['ainvs']).plot())
self.plot_link = '<img src="%s" width="200" height="150"/>' % self.plot
self.properties = [('Label', self.lmfdb_label), (None, self.plot_link),
('Conductor', '\(%s\)' % data['conductor']),
('Discriminant', '\(%s\)' % data['disc']),
('j-invariant', '%s' % data['j_inv_latex']),
('CM', '%s' % data['CM']),
('Rank', '\(%s\)' % mw['rank']),
('Torsion Structure', '\(%s\)' % mw['tor_struct'])]
self.title = "Elliptic Curve %s (Cremona label %s)" % (
self.lmfdb_label, self.label)
self.bread = [('Elliptic Curves', url_for("ecnf.index")),
('$\Q$', url_for(".rational_elliptic_curves")),
('%s' % N, url_for(".by_conductor", conductor=N)),
('%s' % iso,
url_for(".by_double_iso_label",
conductor=N,
iso_label=iso)), ('%s' % num, ' ')]
def code(self):
if self._code == None:
self.make_code_snippets()
return self._code
def make_code_snippets(self):
# read in code.yaml from current directory:
_curdir = os.path.dirname(os.path.abspath(__file__))
self._code = yaml.load(open(os.path.join(_curdir, "code.yaml")))
# Fill in placeholders for this specific curve:
for lang in ['sage', 'pari', 'magma']:
self._code['curve'][lang] = self._code['curve'][lang] % (
self.data['ainvs'], self.label)
return
for k in self._code:
if k != 'prompt':
for lang in self._code[k]:
self._code[k][lang] = self._code[k][lang].split("\n")
# remove final empty line
if len(self._code[k][lang][-1]) == 0:
self._code[k][lang] = self._code[k][lang][:-1]
class WebEC(object):
"""
Class for an elliptic curve over Q
"""
def __init__(self, dbdata):
"""
Arguments:
- dbdata: the data from the database
"""
logger.info("Constructing an instance of ECisog_class")
self.__dict__.update(dbdata)
# Next lines because the hyphens make trouble
self.xintcoords = parse_list(dbdata['x-coordinates_of_integral_points'])
self.non_surjective_primes = dbdata['non-surjective_primes']
self.make_curve()
@staticmethod
def by_label(label):
"""
Searches for a specific elliptic curve in the curves
collection by its label, which can be either in LMFDB or
Cremona format.
"""
print "curve label = %s" % label
try:
N, iso, number = lmfdb_label_regex.match(label).groups()
data = db_ec().find_one({"lmfdb_label" : label})
except AttributeError:
try:
N, iso, number = cremona_label_regex.match(label).groups()
data = db_ec().find_one({"label" : label})
except AttributeError:
return "Invalid label" # caller must catch this and raise an error
if data:
return WebEC(data)
return "Curve not found" # caller must catch this and raise an error
def make_curve(self):
# To start with the data fields of self are just those from
# the database. We need to reformat these, construct the
# actual elliptic curve E, and compute some further (easy)
# data about it.
#
# Weierstrass equation
data = self.data = {}
data['ainvs'] = [int(ai) for ai in self.ainvs]
self.E = EllipticCurve(data['ainvs'])
data['equation'] = web_latex(self.E)
# conductor, j-invariant and discriminant
data['conductor'] = N = ZZ(self.conductor)
bad_primes = N.prime_factors()
try:
data['j_invariant'] = QQ(str(self.jinv))
except KeyError:
data['j_invariant'] = self.E.j_invariant()
data['j_inv_factor'] = latex(0)
if data['j_invariant']:
data['j_inv_factor'] = latex(data['j_invariant'].factor())
data['j_inv_str'] = unicode(str(data['j_invariant']))
data['j_inv_latex'] = web_latex(data['j_invariant'])
data['disc'] = self.E.discriminant()
data['disc_latex'] = web_latex(data['disc'])
data['disc_factor'] = latex(data['disc'].factor())
data['cond_factor'] =latex(N.factor())
data['cond_latex'] = web_latex(N)
# CM and endomorphism ring
data['CMD'] = 0
data['CM'] = "no"
data['EndE'] = "\(\Z\)"
if self.E.has_cm():
data['CMD'] = self.E.cm_discriminant()
data['CM'] = "yes (\(D=%s\))" % data['CMD']
if data['CMD']%4==0:
d4 = ZZ(data['CMD'])//4
data['EndE'] = "\(\Z[\sqrt{%s}]\)" % d4
else:
data['EndE'] = "\(\Z[(1+\sqrt{%s})/2]\)" % data['CMD']
# modular degree
try:
data['degree'] = self.degree
except AttributeError:
try:
data['degree'] = self.E.modular_degree()
except RuntimeError:
data['degree'] # invalid, but will be displayed nicely
# Minimal quadratic twist
E_pari = self.E.pari_curve(prec=200)
from sage.libs.pari.all import PariError
try:
minq = self.E.minimal_quadratic_twist()[0]
except PariError: # this does occur with 164411a1
ec.debug("PariError computing minimal quadratic twist of elliptic curve %s" % lmfdb_label)
minq = self.E
if self.E == minq:
data['minq_label'] = self.lmfdb_label
else:
minq_ainvs = [str(c) for c in minq.ainvs()]
data['minq_label'] = db_ec().find_one({'ainvs': minq_ainvs})['lmfdb_label']
# rational and integral points
mw = self.mw = {}
xintpoints_projective = [self.E.lift_x(x) for x in self.xintcoords]
xintpoints = [P.xy() for P in xintpoints_projective]
mw['int_points'] = ', '.join(web_latex(P) for P in xintpoints)
# Generators of infinite order
mw['rank'] = self.rank
try:
mw['generators'] = ', '.join(web_latex(self.E(g).xy()) for g in parse_points(self.gens))
except AttributeError:
mw['generators'] = ''
# Torsion subgroup: order, structure, generators
mw['tor_order'] = self.torsion
tor_struct = [int(c) for c in self.torsion_structure]
if mw['tor_order'] == 1:
mw['tor_struct'] = '\mathrm{Trivial}'
mw['tor_gens'] = ''
else:
mw['tor_struct'] = ' \\times '.join(['\Z/{%s}\Z' % n
for n in tor_struct])
mw['tor_gens'] = ', '.join(web_latex(self.E(g).xy()) for g in parse_points(self.torsion_generators))
# Images of Galois representations
try:
data['galois_images'] = [trim_galois_image_code(s) for s in self.galois_images]
data['non_surjective_primes'] = self.non_surjective_primes
except AttributeError:
print "No Galois image data"
data['galois_images'] = []
data['non_surjective_primes'] = []
data['galois_data'] = [{'p': p,'image': im }
for p,im in zip(data['non_surjective_primes'],
data['galois_images'])]
# Leading term of L-function & BSD data
bsd = self.bsd = {}
if mw['rank'] >= 2:
bsd['lder_name'] = "L^{(%s)}(E,1)" % mw['rank']
elif mw['rank']:
bsd['lder_name'] = "L'(E,1)"
else:
bsd['lder_name'] = "L(E,1)"
bsd['reg'] = self.regulator
bsd['omega'] = self.real_period
bsd['sha'] = int(0.1+self.sha_an)
bsd['lder'] = self.special_value
# Optimality (the optimal curve in the class is the curve
# whose Cremona label ends in '1' except for '990h' which was
# labelled wrongly long ago)
if self.iso == '990h':
data['Gamma0optimal'] = bool(self.number == 3)
else:
data['Gamma0optimal'] = bool(self.number == 1)
data['p_adic_data_exists'] = False
if data['Gamma0optimal']:
data['p_adic_data_exists'] = (padic_db().find({'lmfdb_iso': self.lmfdb_iso}).count()) > 0
data['p_adic_primes'] = [p for p in sage.all.prime_range(5, 100)
if self.E.is_ordinary(p) and not p.divides(N)]
# Local data
local_data = self.local_data = []
# if we use E.tamagawa_numbers() it calls E.local_data(p) which
# crashes on some curves e.g. 164411a1
tamagawa_numbers = []
for p in bad_primes:
local_info = self.E.local_data(p, algorithm="generic")
local_data_p = {}
local_data_p['p'] = p
local_data_p['tamagawa_number'] = local_info.tamagawa_number()
tamagawa_numbers.append(ZZ(local_info.tamagawa_number()))
local_data_p['kodaira_symbol'] = web_latex(local_info.kodaira_symbol()).replace('$', '')
local_data_p['reduction_type'] = local_info.bad_reduction_type()
local_data.append(local_data_p)
bsd['tamagawa_factors'] = r' \cdot '.join(str(c.factor()) for c in tamagawa_numbers)
bsd['tamagawa_product'] = sage.misc.all.prod(tamagawa_numbers)
mod_form_iso = lmfdb_label_regex.match(self.lmfdb_iso).groups()[1]
data['newform'] = web_latex(self.E.q_eigenform(10))
self.friends = [
('Isogeny class ' + self.lmfdb_iso, url_for(".by_ec_label", label=self.lmfdb_iso)),
('Minimal quadratic twist ' + data['minq_label'], url_for(".by_ec_label", label=data['minq_label'])),
('All twists ', url_for(".rational_elliptic_curves", jinv=self.jinv)),
('L-function', url_for("l_functions.l_function_ec_page", label=self.lmfdb_label)),
('Symmetric square L-function', url_for("l_functions.l_function_ec_sym_page", power='2', label=self.lmfdb_iso)),
('Symmetric 4th power L-function', url_for("l_functions.l_function_ec_sym_page", power='4', label=self.lmfdb_iso)),
('Modular form ' + self.lmfdb_iso.replace('.', '.2'), url_for("emf.render_elliptic_modular_forms", level=int(N), weight=2, character=0, label=mod_form_iso))]
self.downloads = [('Download coeffients of q-expansion', url_for(".download_EC_qexp", label=self.lmfdb_label, limit=100)),
('Download all stored data', url_for(".download_EC_all", label=self.lmfdb_label))]
self.plot = encode_plot(self.E.plot())
self.plot_link = '<img src="%s" width="200" height="150"/>' % self.plot
self.properties = [('Label', self.lmfdb_label),
(None, self.plot_link),
('Conductor', '\(%s\)' % data['conductor']),
('Discriminant', '\(%s\)' % data['disc']),
('j-invariant', '%s' % data['j_inv_latex']),
('CM', '%s' % data['CM']),
('Rank', '\(%s\)' % mw['rank']),
('Torsion Structure', '\(%s\)' % mw['tor_struct'])
]
if self.lmfdb_iso == self.iso:
self.title = "Elliptic Curve %s" % self.lmfdb_label
else:
self.title = "Elliptic Curve %s (Cremona label %s)" % (self.lmfdb_label, self.label)
self.bread = [('Elliptic Curves ', url_for(".rational_elliptic_curves")), ('isogeny class %s' % self.lmfdb_iso, ' ')]
class WebEC(object):
"""
Class for an elliptic curve over Q
"""
def __init__(self, dbdata):
"""
Arguments:
- dbdata: the data from the database
"""
logger.debug("Constructing an instance of ECisog_class")
self.__dict__.update(dbdata)
# Next lines because the hyphens make trouble
self.xintcoords = split_list(dbdata["x-coordinates_of_integral_points"])
self.non_surjective_primes = dbdata["non-surjective_primes"]
# Next lines because the python identifiers cannot start with 2
self.twoadic_index = dbdata["2adic_index"]
self.twoadic_log_level = dbdata["2adic_log_level"]
self.twoadic_gens = dbdata["2adic_gens"]
self.twoadic_label = dbdata["2adic_label"]
# All other fields are handled here
self.make_curve()
@staticmethod
def by_label(label):
"""
Searches for a specific elliptic curve in the curves
collection by its label, which can be either in LMFDB or
Cremona format.
"""
try:
N, iso, number = split_lmfdb_label(label)
data = db_ec().find_one({"lmfdb_label": label})
except AttributeError:
try:
N, iso, number = split_cremona_label(label)
data = db_ec().find_one({"label": label})
except AttributeError:
return "Invalid label" # caller must catch this and raise an error
if data:
return WebEC(data)
return "Curve not found" # caller must catch this and raise an error
def make_curve(self):
# To start with the data fields of self are just those from
# the database. We need to reformat these, construct the
# actual elliptic curve E, and compute some further (easy)
# data about it.
#
# Weierstrass equation
data = self.data = {}
data["ainvs"] = [int(ai) for ai in self.ainvs]
self.E = EllipticCurve(data["ainvs"])
data["equation"] = web_latex(self.E)
# conductor, j-invariant and discriminant
data["conductor"] = N = ZZ(self.conductor)
bad_primes = N.prime_factors()
try:
data["j_invariant"] = QQ(str(self.jinv))
except KeyError:
data["j_invariant"] = self.E.j_invariant()
data["j_inv_factor"] = latex(0)
if data["j_invariant"]:
data["j_inv_factor"] = latex(data["j_invariant"].factor())
data["j_inv_str"] = unicode(str(data["j_invariant"]))
data["j_inv_latex"] = web_latex(data["j_invariant"])
data["disc"] = D = self.E.discriminant()
data["disc_latex"] = web_latex(data["disc"])
data["disc_factor"] = latex(data["disc"].factor())
data["cond_factor"] = latex(N.factor())
data["cond_latex"] = web_latex(N)
# CM and endomorphism ring
data["CMD"] = self.cm
data["CM"] = "no"
data["EndE"] = "\(\Z\)"
if self.cm:
data["CM"] = "yes (\(D=%s\))" % data["CMD"]
if data["CMD"] % 4 == 0:
d4 = ZZ(data["CMD"]) // 4
data["EndE"] = "\(\Z[\sqrt{%s}]\)" % d4
else:
data["EndE"] = "\(\Z[(1+\sqrt{%s})/2]\)" % data["CMD"]
data["ST"] = '<a href="%s">$%s$</a>' % (url_for("st.by_label", label="1.2.N(U(1))"), "N(\\mathrm{U}(1))")
else:
data["ST"] = '<a href="%s">$%s$</a>' % (url_for("st.by_label", label="1.2.SU(2)"), "\\mathrm{SU}(2)")
# modular degree
try:
data["degree"] = self.degree
except AttributeError:
try:
data["degree"] = self.E.modular_degree()
except RuntimeError:
data["degree"] # invalid, but will be displayed nicely
# Minimal quadratic twist
E_pari = self.E.pari_curve()
from sage.libs.pari.all import PariError
try:
minq, minqD = self.E.minimal_quadratic_twist()
except PariError: # this does occur with 164411a1
ec.debug("PariError computing minimal quadratic twist of elliptic curve %s" % lmfdb_label)
minq = self.E
minqD = 1
data["minq_D"] = minqD
if self.E == minq:
data["minq_label"] = self.lmfdb_label
data["minq_info"] = "(itself)"
else:
minq_ainvs = [str(c) for c in minq.ainvs()]
data["minq_label"] = db_ec().find_one({"jinv": str(self.E.j_invariant()), "ainvs": minq_ainvs})[
"lmfdb_label"
]
data["minq_info"] = "(by %s)" % minqD
minq_N, minq_iso, minq_number = split_lmfdb_label(data["minq_label"])
# rational and integral points
mw = self.mw = {}
xintpoints_projective = [self.E.lift_x(x) for x in self.xintcoords]
xintpoints = [P.xy() for P in xintpoints_projective]
mw["int_points"] = ", ".join(web_latex(P) for P in xintpoints)
# Generators of infinite order
mw["rank"] = self.rank
try:
self.generators = [self.E(g) for g in parse_points(self.gens)]
mw["generators"] = [web_latex(P.xy()) for P in self.generators]
mw["heights"] = [P.height() for P in self.generators]
except AttributeError:
mw["generators"] = ""
mw["heights"] = []
# Torsion subgroup: order, structure, generators
mw["tor_order"] = self.torsion
tor_struct = [int(c) for c in self.torsion_structure]
if mw["tor_order"] == 1:
mw["tor_struct"] = "\mathrm{Trivial}"
mw["tor_gens"] = ""
else:
mw["tor_struct"] = " \\times ".join(["\Z/{%s}\Z" % n for n in tor_struct])
mw["tor_gens"] = ", ".join(web_latex(self.E(g).xy()) for g in parse_points(self.torsion_generators))
# Images of Galois representations
try:
data["galois_images"] = [trim_galois_image_code(s) for s in self.galois_images]
data["non_surjective_primes"] = self.non_surjective_primes
except AttributeError:
# print "No Galois image data"
data["galois_images"] = []
data["non_surjective_primes"] = []
data["galois_data"] = [
{"p": p, "image": im} for p, im in zip(data["non_surjective_primes"], data["galois_images"])
]
if self.twoadic_gens:
from sage.matrix.all import Matrix
data["twoadic_gen_matrices"] = ",".join([latex(Matrix(2, 2, M)) for M in self.twoadic_gens])
data["twoadic_rouse_url"] = ROUSE_URL_PREFIX + self.twoadic_label + ".html"
# Leading term of L-function & BSD data
bsd = self.bsd = {}
r = self.rank
if r >= 2:
bsd["lder_name"] = "L^{(%s)}(E,1)/%s!" % (r, r)
elif r:
bsd["lder_name"] = "L'(E,1)"
else:
bsd["lder_name"] = "L(E,1)"
bsd["reg"] = self.regulator
bsd["omega"] = self.real_period
bsd["sha"] = int(0.1 + self.sha_an)
bsd["lder"] = self.special_value
# Optimality (the optimal curve in the class is the curve
# whose Cremona label ends in '1' except for '990h' which was
# labelled wrongly long ago)
if self.iso == "990h":
data["Gamma0optimal"] = bool(self.number == 3)
else:
data["Gamma0optimal"] = bool(self.number == 1)
data["p_adic_data_exists"] = False
if data["Gamma0optimal"]:
data["p_adic_data_exists"] = (padic_db().find({"lmfdb_iso": self.lmfdb_iso}).count()) > 0
data["p_adic_primes"] = [p for p in sage.all.prime_range(5, 100) if self.E.is_ordinary(p) and not p.divides(N)]
# Local data
local_data = self.local_data = []
# if we use E.tamagawa_numbers() it calls E.local_data(p) which
# used to crash on some curves e.g. 164411a1
tamagawa_numbers = []
for p in bad_primes:
local_info = self.E.local_data(p, algorithm="generic")
local_data_p = {}
local_data_p["p"] = p
local_data_p["tamagawa_number"] = local_info.tamagawa_number()
tamagawa_numbers.append(ZZ(local_info.tamagawa_number()))
local_data_p["kodaira_symbol"] = web_latex(local_info.kodaira_symbol()).replace("$", "")
local_data_p["reduction_type"] = local_info.bad_reduction_type()
local_data_p["ord_cond"] = local_info.conductor_valuation()
local_data_p["ord_disc"] = local_info.discriminant_valuation()
local_data_p["ord_den_j"] = max(0, -self.E.j_invariant().valuation(p))
local_data.append(local_data_p)
cp_fac = [cp.factor() for cp in tamagawa_numbers]
cp_fac = [latex(cp) if len(cp) < 2 else "(" + latex(cp) + ")" for cp in cp_fac]
bsd["tamagawa_factors"] = r"\cdot".join(cp_fac)
bsd["tamagawa_product"] = sage.misc.all.prod(tamagawa_numbers)
cond, iso, num = split_lmfdb_label(self.lmfdb_label)
data["newform"] = web_latex(self.E.q_eigenform(10))
self.newform_label = newform_label(cond, 2, 1, iso)
self.newform_link = url_for("emf.render_elliptic_modular_forms", level=cond, weight=2, character=1, label=iso)
newform_exists_in_db = is_newform_in_db(self.newform_label)
self._code = None
self.friends = [
("Isogeny class " + self.lmfdb_iso, url_for(".by_double_iso_label", conductor=N, iso_label=iso)),
(
"Minimal quadratic twist %s %s" % (data["minq_info"], data["minq_label"]),
url_for(".by_triple_label", conductor=minq_N, iso_label=minq_iso, number=minq_number),
),
("All twists ", url_for(".rational_elliptic_curves", jinv=self.jinv)),
("L-function", url_for("l_functions.l_function_ec_page", label=self.lmfdb_label)),
]
if not self.cm:
if N <= 300:
self.friends += [
(
"Symmetric square L-function",
url_for("l_functions.l_function_ec_sym_page", power="2", label=self.lmfdb_iso),
)
]
if N <= 50:
self.friends += [
(
"Symmetric cube L-function",
url_for("l_functions.l_function_ec_sym_page", power="3", label=self.lmfdb_iso),
)
]
if newform_exists_in_db:
self.friends += [("Modular form " + self.newform_label, self.newform_link)]
self.downloads = [
("Download coefficients of q-expansion", url_for(".download_EC_qexp", label=self.lmfdb_label, limit=100)),
("Download all stored data", url_for(".download_EC_all", label=self.lmfdb_label)),
(
"Download Magma code",
url_for(
".ec_code_download",
conductor=cond,
iso=iso,
number=num,
label=self.lmfdb_label,
download_type="magma",
),
),
(
"Download Sage code",
url_for(
".ec_code_download",
conductor=cond,
iso=iso,
number=num,
label=self.lmfdb_label,
download_type="sage",
),
),
(
"Download GP code",
url_for(
".ec_code_download", conductor=cond, iso=iso, number=num, label=self.lmfdb_label, download_type="gp"
),
),
]
self.plot = encode_plot(self.E.plot())
self.plot_link = '<img src="%s" width="200" height="150"/>' % self.plot
self.properties = [
("Label", self.lmfdb_label),
(None, self.plot_link),
("Conductor", "\(%s\)" % data["conductor"]),
("Discriminant", "\(%s\)" % data["disc"]),
("j-invariant", "%s" % data["j_inv_latex"]),
("CM", "%s" % data["CM"]),
("Rank", "\(%s\)" % mw["rank"]),
("Torsion Structure", "\(%s\)" % mw["tor_struct"]),
]
self.title = "Elliptic Curve %s (Cremona label %s)" % (self.lmfdb_label, self.label)
self.bread = [
("Elliptic Curves", url_for("ecnf.index")),
("$\Q$", url_for(".rational_elliptic_curves")),
("%s" % N, url_for(".by_conductor", conductor=N)),
("%s" % iso, url_for(".by_double_iso_label", conductor=N, iso_label=iso)),
("%s" % num, " "),
]
def code(self):
if self._code == None:
self.make_code_snippets()
return self._code
def make_code_snippets(self):
# read in code.yaml from current directory:
_curdir = os.path.dirname(os.path.abspath(__file__))
self._code = yaml.load(open(os.path.join(_curdir, "code.yaml")))
# Fill in placeholders for this specific curve:
for lang in ["sage", "pari", "magma"]:
self._code["curve"][lang] = self._code["curve"][lang] % (self.data["ainvs"], self.label)
for k in self._code:
if k != "prompt":
for lang in self._code[k]:
self._code[k][lang] = self._code[k][lang].split("\n")
# remove final empty line
if len(self._code[k][lang][-1]) == 0:
self._code[k][lang] = self._code[k][lang][:-1]
class WebEC(object):
"""
Class for an elliptic curve over Q
"""
def __init__(self, dbdata):
"""
Arguments:
- dbdata: the data from the database
"""
logger.debug("Constructing an instance of ECisog_class")
self.__dict__.update(dbdata)
# Next lines because the hyphens make trouble
self.xintcoords = parse_list(
dbdata['x-coordinates_of_integral_points'])
self.non_surjective_primes = dbdata['non-surjective_primes']
# Next lines because the python identifiers cannot start with 2
self.twoadic_index = dbdata['2adic_index']
self.twoadic_log_level = dbdata['2adic_log_level']
self.twoadic_gens = dbdata['2adic_gens']
self.twoadic_label = dbdata['2adic_label']
# All other fields are handled here
self.make_curve()
@staticmethod
def by_label(label):
"""
Searches for a specific elliptic curve in the curves
collection by its label, which can be either in LMFDB or
Cremona format.
"""
try:
N, iso, number = split_lmfdb_label(label)
data = db_ec().find_one({"lmfdb_label": label})
except AttributeError:
try:
N, iso, number = split_cremona_label(label)
data = db_ec().find_one({"label": label})
except AttributeError:
return "Invalid label" # caller must catch this and raise an error
if data:
return WebEC(data)
return "Curve not found" # caller must catch this and raise an error
def make_curve(self):
# To start with the data fields of self are just those from
# the database. We need to reformat these, construct the
# actual elliptic curve E, and compute some further (easy)
# data about it.
#
# Weierstrass equation
data = self.data = {}
data['ainvs'] = [int(ai) for ai in self.ainvs]
self.E = EllipticCurve(data['ainvs'])
data['equation'] = web_latex(self.E)
# conductor, j-invariant and discriminant
data['conductor'] = N = ZZ(self.conductor)
bad_primes = N.prime_factors()
try:
data['j_invariant'] = QQ(str(self.jinv))
except KeyError:
data['j_invariant'] = self.E.j_invariant()
data['j_inv_factor'] = latex(0)
if data['j_invariant']:
data['j_inv_factor'] = latex(data['j_invariant'].factor())
data['j_inv_str'] = unicode(str(data['j_invariant']))
data['j_inv_latex'] = web_latex(data['j_invariant'])
data['disc'] = D = self.E.discriminant()
data['disc_latex'] = web_latex(data['disc'])
data['disc_factor'] = latex(data['disc'].factor())
data['cond_factor'] = latex(N.factor())
data['cond_latex'] = web_latex(N)
# CM and endomorphism ring
data['CMD'] = self.cm
data['CM'] = "no"
data['EndE'] = "\(\Z\)"
if self.cm:
data['CM'] = "yes (\(D=%s\))" % data['CMD']
if data['CMD'] % 4 == 0:
d4 = ZZ(data['CMD']) // 4
data['EndE'] = "\(\Z[\sqrt{%s}]\)" % d4
else:
data['EndE'] = "\(\Z[(1+\sqrt{%s})/2]\)" % data['CMD']
# modular degree
try:
data['degree'] = self.degree
except AttributeError:
try:
data['degree'] = self.E.modular_degree()
except RuntimeError:
data['degree'] # invalid, but will be displayed nicely
# Minimal quadratic twist
E_pari = self.E.pari_curve()
from sage.libs.pari.all import PariError
try:
minq, minqD = self.E.minimal_quadratic_twist()
except PariError: # this does occur with 164411a1
ec.debug(
"PariError computing minimal quadratic twist of elliptic curve %s"
% lmfdb_label)
minq = self.E
minqD = 1
data['minq_D'] = minqD
if self.E == minq:
data['minq_label'] = self.lmfdb_label
data['minq_info'] = '(itself)'
else:
minq_ainvs = [str(c) for c in minq.ainvs()]
data['minq_label'] = db_ec().find_one({'ainvs':
minq_ainvs})['lmfdb_label']
data['minq_info'] = '(by %s)' % minqD
minq_N, minq_iso, minq_number = split_lmfdb_label(data['minq_label'])
# rational and integral points
mw = self.mw = {}
xintpoints_projective = [self.E.lift_x(x) for x in self.xintcoords]
xintpoints = [P.xy() for P in xintpoints_projective]
mw['int_points'] = ', '.join(web_latex(P) for P in xintpoints)
# Generators of infinite order
mw['rank'] = self.rank
try:
self.generators = [self.E(g) for g in parse_points(self.gens)]
mw['generators'] = [web_latex(P.xy()) for P in self.generators]
mw['heights'] = [P.height() for P in self.generators]
except AttributeError:
mw['generators'] = ''
mw['heights'] = []
# Torsion subgroup: order, structure, generators
mw['tor_order'] = self.torsion
tor_struct = [int(c) for c in self.torsion_structure]
if mw['tor_order'] == 1:
mw['tor_struct'] = '\mathrm{Trivial}'
mw['tor_gens'] = ''
else:
mw['tor_struct'] = ' \\times '.join(
['\Z/{%s}\Z' % n for n in tor_struct])
mw['tor_gens'] = ', '.join(
web_latex(self.E(g).xy())
for g in parse_points(self.torsion_generators))
# Images of Galois representations
try:
data['galois_images'] = [
trim_galois_image_code(s) for s in self.galois_images
]
data['non_surjective_primes'] = self.non_surjective_primes
except AttributeError:
#print "No Galois image data"
data['galois_images'] = []
data['non_surjective_primes'] = []
data['galois_data'] = [{
'p': p,
'image': im
} for p, im in zip(data['non_surjective_primes'],
data['galois_images'])]
if self.twoadic_gens:
from sage.matrix.all import Matrix
data['twoadic_gen_matrices'] = ','.join(
[latex(Matrix(2, 2, M)) for M in self.twoadic_gens])
data[
'twoadic_rouse_url'] = ROUSE_URL_PREFIX + self.twoadic_label + ".html"
# Leading term of L-function & BSD data
bsd = self.bsd = {}
r = self.rank
if r >= 2:
bsd['lder_name'] = "L^{(%s)}(E,1)/%s!" % (r, r)
elif r:
bsd['lder_name'] = "L'(E,1)"
else:
bsd['lder_name'] = "L(E,1)"
bsd['reg'] = self.regulator
bsd['omega'] = self.real_period
bsd['sha'] = int(0.1 + self.sha_an)
bsd['lder'] = self.special_value
# Optimality (the optimal curve in the class is the curve
# whose Cremona label ends in '1' except for '990h' which was
# labelled wrongly long ago)
if self.iso == '990h':
data['Gamma0optimal'] = bool(self.number == 3)
else:
data['Gamma0optimal'] = bool(self.number == 1)
data['p_adic_data_exists'] = False
if data['Gamma0optimal']:
data['p_adic_data_exists'] = (padic_db().find({
'lmfdb_iso':
self.lmfdb_iso
}).count()) > 0
data['p_adic_primes'] = [
p for p in sage.all.prime_range(5, 100)
if self.E.is_ordinary(p) and not p.divides(N)
]
# Local data
local_data = self.local_data = []
# if we use E.tamagawa_numbers() it calls E.local_data(p) which
# used to crash on some curves e.g. 164411a1
tamagawa_numbers = []
for p in bad_primes:
local_info = self.E.local_data(p, algorithm="generic")
local_data_p = {}
local_data_p['p'] = p
local_data_p['tamagawa_number'] = local_info.tamagawa_number()
tamagawa_numbers.append(ZZ(local_info.tamagawa_number()))
local_data_p['kodaira_symbol'] = web_latex(
local_info.kodaira_symbol()).replace('$', '')
local_data_p['reduction_type'] = local_info.bad_reduction_type()
local_data_p['ord_cond'] = local_info.conductor_valuation()
local_data_p['ord_disc'] = local_info.discriminant_valuation()
local_data_p['ord_den_j'] = max(0,
-self.E.j_invariant().valuation(p))
local_data.append(local_data_p)
cp_fac = [cp.factor() for cp in tamagawa_numbers]
cp_fac = [
latex(cp) if len(cp) < 2 else '(' + latex(cp) + ')'
for cp in cp_fac
]
bsd['tamagawa_factors'] = r'\cdot'.join(cp_fac)
bsd['tamagawa_product'] = sage.misc.all.prod(tamagawa_numbers)
cond, iso, num = split_lmfdb_label(self.lmfdb_label)
data['newform'] = web_latex(self.E.q_eigenform(10))
self.make_code_snippets()
self.friends = [('Isogeny class ' + self.lmfdb_iso,
url_for(".by_double_iso_label",
conductor=N,
iso_label=iso)),
('Minimal quadratic twist %s %s' %
(data['minq_info'], data['minq_label']),
url_for(".by_triple_label",
conductor=minq_N,
iso_label=minq_iso,
number=minq_number)),
('All twists ',
url_for(".rational_elliptic_curves", jinv=self.jinv)),
('L-function',
url_for("l_functions.l_function_ec_page",
label=self.lmfdb_label)),
('Symmetric square L-function',
url_for("l_functions.l_function_ec_sym_page",
power='2',
label=self.lmfdb_iso)),
('Symmetric 4th power L-function',
url_for("l_functions.l_function_ec_sym_page",
power='4',
label=self.lmfdb_iso)),
('Modular form ' + self.lmfdb_iso.replace('.', '.2'),
url_for("emf.render_elliptic_modular_forms",
level=int(N),
weight=2,
character=1,
label=iso))]
self.downloads = [('Download coefficients of q-expansion',
url_for(".download_EC_qexp",
label=self.lmfdb_label,
limit=100)),
('Download all stored data',
url_for(".download_EC_all",
label=self.lmfdb_label))]
self.plot = encode_plot(self.E.plot())
self.plot_link = '<img src="%s" width="200" height="150"/>' % self.plot
self.properties = [('Label', self.lmfdb_label), (None, self.plot_link),
('Conductor', '\(%s\)' % data['conductor']),
('Discriminant', '\(%s\)' % data['disc']),
('j-invariant', '%s' % data['j_inv_latex']),
('CM', '%s' % data['CM']),
('Rank', '\(%s\)' % mw['rank']),
('Torsion Structure', '\(%s\)' % mw['tor_struct'])]
self.title = "Elliptic Curve %s (Cremona label %s)" % (
self.lmfdb_label, self.label)
self.bread = [('Elliptic Curves', url_for("ecnf.index")),
('$\Q$', url_for(".rational_elliptic_curves")),
('%s' % N, url_for(".by_conductor", conductor=N)),
('%s' % iso,
url_for(".by_double_iso_label",
conductor=N,
iso_label=iso)), ('%s' % num, ' ')]
def make_code_snippets(self):
# read in code.yaml from current directory:
_curdir = os.path.dirname(os.path.abspath(__file__))
self.code = yaml.load(open(os.path.join(_curdir, "code.yaml")))
# Fill in placeholders for this specific curve:
for lang in ['sage', 'pari', 'magma']:
self.code['curve'][lang] = self.code['curve'][lang] % (
self.data['ainvs'], self.label)
for k in self.code:
if k != 'prompt':
for lang in self.code[k]:
self.code[k][lang] = self.code[k][lang].split("\n")
# remove final empty line
if len(self.code[k][lang][-1]) == 0:
self.code[k][lang] = self.code[k][lang][:-1]
class WebEC(object):
"""
Class for an elliptic curve over Q
"""
def __init__(self, dbdata):
"""
Arguments:
- dbdata: the data from the database
"""
logger.debug("Constructing an instance of ECisog_class")
self.__dict__.update(dbdata)
# Next lines because the hyphens make trouble
self.xintcoords = split_list(dbdata['x-coordinates_of_integral_points'])
self.non_surjective_primes = dbdata['non-surjective_primes']
# Next lines because the python identifiers cannot start with 2
self.twoadic_index = dbdata['2adic_index']
self.twoadic_log_level = dbdata['2adic_log_level']
self.twoadic_gens = dbdata['2adic_gens']
self.twoadic_label = dbdata['2adic_label']
# All other fields are handled here
self.make_curve()
@staticmethod
def by_label(label):
"""
Searches for a specific elliptic curve in the curves
collection by its label, which can be either in LMFDB or
Cremona format.
"""
try:
N, iso, number = split_lmfdb_label(label)
data = db_ec().find_one({"lmfdb_label" : label})
except AttributeError:
try:
N, iso, number = split_cremona_label(label)
data = db_ec().find_one({"label" : label})
except AttributeError:
return "Invalid label" # caller must catch this and raise an error
if data:
return WebEC(data)
return "Curve not found" # caller must catch this and raise an error
def make_curve(self):
# To start with the data fields of self are just those from
# the database. We need to reformat these.
# Old version: required constructing the actual elliptic curve
# E, and computing some further data about it.
# New version (May 2016): extra data fields now in the
# database so we do not have to construct the curve or do any
# computation with it on the fly. As a failsafe the old way
# is still included.
data = self.data = {}
try:
data['ainvs'] = [int(c) for c in self.xainvs[1:-1].split(',')]
except AttributeError:
data['ainvs'] = [int(ai) for ai in self.ainvs]
data['conductor'] = N = ZZ(self.conductor)
data['j_invariant'] = QQ(str(self.jinv))
data['j_inv_factor'] = latex(0)
if data['j_invariant']: # don't factor 0
data['j_inv_factor'] = latex(data['j_invariant'].factor())
data['j_inv_str'] = unicode(str(data['j_invariant']))
data['j_inv_latex'] = web_latex(data['j_invariant'])
mw = self.mw = {}
mw['rank'] = self.rank
mw['int_points'] = ''
if self.xintcoords:
a1, a2, a3, a4, a6 = [ZZ(a) for a in data['ainvs']]
def lift_x(x):
f = ((x + a2) * x + a4) * x + a6
b = (a1*x + a3)
d = (b*b + 4*f).sqrt()
return (x, (-b+d)/2)
mw['int_points'] = ', '.join(web_latex(lift_x(x)) for x in self.xintcoords)
mw['generators'] = ''
mw['heights'] = []
if self.gens:
mw['generators'] = [web_latex(tuple(P)) for P in parse_points(self.gens)]
mw['tor_order'] = self.torsion
tor_struct = [int(c) for c in self.torsion_structure]
if mw['tor_order'] == 1:
mw['tor_struct'] = '\mathrm{Trivial}'
mw['tor_gens'] = ''
else:
mw['tor_struct'] = ' \\times '.join(['\Z/{%s}\Z' % n for n in tor_struct])
mw['tor_gens'] = ', '.join(web_latex(tuple(P)) for P in parse_points(self.torsion_generators))
# try to get all the data we need from the database entry (now in self)
try:
data['equation'] = self.equation
local_data = self.local_data
badprimes = [ZZ(ld['p']) for ld in local_data]
D = self.signD * prod([ld['p']**ld['ord_disc'] for ld in local_data])
data['disc'] = D
Nfac = Factorization([(ZZ(ld['p']),ld['ord_cond']) for ld in local_data])
Dfac = Factorization([(ZZ(ld['p']),ld['ord_disc']) for ld in local_data], unit=ZZ(self.signD))
data['minq_D'] = minqD = self.min_quad_twist['disc']
minq_label = self.min_quad_twist['label']
data['minq_label'] = db_ec().find_one({'label':minq_label}, ['lmfdb_label'])['lmfdb_label']
data['minq_info'] = '(itself)' if minqD==1 else '(by %s)' % minqD
try:
data['degree'] = self.degree
except AttributeError:
data['degree'] =0 # invalid, but will be displayed nicely
mw['heights'] = self.heights
if self.number == 1:
data['an'] = self.anlist
data['ap'] = self.aplist
else:
r = db_ec().find_one({'lmfdb_iso':self.lmfdb_iso, 'number':1}, ['anlist','aplist'])
data['an'] = r['anlist']
data['ap'] = r['aplist']
# otherwise fall back to computing it from the curve
except AttributeError:
print("Falling back to constructing E")
self.E = EllipticCurve(data['ainvs'])
data['equation'] = web_latex(self.E)
data['disc'] = D = self.E.discriminant()
Nfac = N.factor()
Dfac = D.factor()
bad_primes = [p for p,e in Nfac]
try:
data['degree'] = self.degree
except AttributeError:
try:
data['degree'] = self.E.modular_degree()
except RuntimeError:
data['degree'] = 0 # invalid, but will be displayed nicely
minq, minqD = self.E.minimal_quadratic_twist()
data['minq_D'] = minqD
if minqD == 1:
data['minq_label'] = self.lmfdb_label
data['minq_info'] = '(itself)'
else:
# This relies on the minimal twist being in the
# database, which is true when the database only
# contains the Cremona database. It would be a good
# idea if, when the database is extended, we ensured
# that for any curve included, all twists of smaller
# conductor are also included.
minq_ainvs = [str(c) for c in minq.ainvs()]
data['minq_label'] = db_ec().find_one({'jinv':str(self.E.j_invariant()),
'ainvs': minq_ainvs},['lmfdb_label'])['lmfdb_label']
data['minq_info'] = '(by %s)' % minqD
if self.gens:
self.generators = [self.E(g) for g in parse_points(self.gens)]
mw['heights'] = [P.height() for P in self.generators]
data['an'] = self.E.anlist(20,python_ints=True)
data['ap'] = self.E.aplist(100,python_ints=True)
self.local_data = local_data = []
for p in bad_primes:
ld = self.E.local_data(p, algorithm="generic")
local_data_p = {}
local_data_p['p'] = p
local_data_p['cp'] = ld.tamagawa_number()
local_data_p['kod'] = web_latex(ld.kodaira_symbol()).replace('$', '')
local_data_p['red'] = ld.bad_reduction_type()
local_data_p['ord_cond'] = ld.conductor_valuation()
local_data_p['ord_disc'] = ld.discriminant_valuation()
local_data_p['ord_den_j'] = max(0,-self.E.j_invariant().valuation(p))
local_data.append(local_data_p)
jfac = Factorization([(ZZ(ld['p']),ld['ord_den_j']) for ld in local_data])
minq_N, minq_iso, minq_number = split_lmfdb_label(data['minq_label'])
data['disc_factor'] = latex(Dfac)
data['cond_factor'] =latex(Nfac)
data['disc_latex'] = web_latex(D)
data['cond_latex'] = web_latex(N)
data['CMD'] = self.cm
data['CM'] = "no"
data['EndE'] = "\(\Z\)"
if self.cm:
data['CM'] = "yes (\(D=%s\))" % data['CMD']
if data['CMD']%4==0:
d4 = ZZ(data['CMD'])//4
data['EndE'] = "\(\Z[\sqrt{%s}]\)" % d4
else:
data['EndE'] = "\(\Z[(1+\sqrt{%s})/2]\)" % data['CMD']
data['ST'] = '<a href="%s">$%s$</a>' % (url_for('st.by_label', label='1.2.N(U(1))'),'N(\\mathrm{U}(1))')
else:
data['ST'] = '<a href="%s">$%s$</a>' % (url_for('st.by_label', label='1.2.SU(2)'),'\\mathrm{SU}(2)')
data['p_adic_primes'] = [p for i,p in enumerate(sage.all.prime_range(5, 100))
if (N*data['ap'][i]) %p !=0]
try:
data['galois_images'] = [trim_galois_image_code(s) for s in self.galois_images]
data['non_surjective_primes'] = self.non_surjective_primes
except AttributeError:
#print "No Galois image data"
data['galois_images'] = []
data['non_surjective_primes'] = []
data['galois_data'] = [{'p': p,'image': im }
for p,im in zip(data['non_surjective_primes'],
data['galois_images'])]
if self.twoadic_gens:
from sage.matrix.all import Matrix
data['twoadic_gen_matrices'] = ','.join([latex(Matrix(2,2,M)) for M in self.twoadic_gens])
data['twoadic_rouse_url'] = ROUSE_URL_PREFIX + self.twoadic_label + ".html"
# Leading term of L-function & BSD data
bsd = self.bsd = {}
r = self.rank
if r >= 2:
bsd['lder_name'] = "L^{(%s)}(E,1)/%s!" % (r,r)
elif r:
bsd['lder_name'] = "L'(E,1)"
else:
bsd['lder_name'] = "L(E,1)"
bsd['reg'] = self.regulator
bsd['omega'] = self.real_period
bsd['sha'] = int(0.1+self.sha_an)
bsd['lder'] = self.special_value
# Optimality (the optimal curve in the class is the curve
# whose Cremona label ends in '1' except for '990h' which was
# labelled wrongly long ago)
if self.iso == '990h':
data['Gamma0optimal'] = bool(self.number == 3)
else:
data['Gamma0optimal'] = bool(self.number == 1)
data['p_adic_data_exists'] = False
if data['Gamma0optimal']:
data['p_adic_data_exists'] = (padic_db().find({'lmfdb_iso': self.lmfdb_iso}).count()) > 0
tamagawa_numbers = [ZZ(ld['cp']) for ld in local_data]
cp_fac = [cp.factor() for cp in tamagawa_numbers]
cp_fac = [latex(cp) if len(cp)<2 else '('+latex(cp)+')' for cp in cp_fac]
bsd['tamagawa_factors'] = r'\cdot'.join(cp_fac)
bsd['tamagawa_product'] = sage.misc.all.prod(tamagawa_numbers)
cond, iso, num = split_lmfdb_label(self.lmfdb_label)
data['newform'] = web_latex(PowerSeriesRing(QQ, 'q')(data['an'], 20, check=True))
data['newform_label'] = self.newform_label = newform_label(cond,2,1,iso)
self.newform_link = url_for("emf.render_elliptic_modular_forms", level=cond, weight=2, character=1, label=iso)
self.newform_exists_in_db = is_newform_in_db(self.newform_label)
self._code = None
self.friends = [
('Isogeny class ' + self.lmfdb_iso, url_for(".by_double_iso_label", conductor=N, iso_label=iso)),
('Minimal quadratic twist %s %s' % (data['minq_info'], data['minq_label']), url_for(".by_triple_label", conductor=minq_N, iso_label=minq_iso, number=minq_number)),
('All twists ', url_for(".rational_elliptic_curves", jinv=self.jinv)),
('L-function', url_for("l_functions.l_function_ec_page", label=self.lmfdb_label))]
if not self.cm:
if N<=300:
self.friends += [('Symmetric square L-function', url_for("l_functions.l_function_ec_sym_page", power='2', label=self.lmfdb_iso))]
if N<=50:
self.friends += [('Symmetric cube L-function', url_for("l_functions.l_function_ec_sym_page", power='3', label=self.lmfdb_iso))]
if self.newform_exists_in_db:
self.friends += [('Modular form ' + self.newform_label, self.newform_link)]
self.downloads = [('Download coefficients of q-expansion', url_for(".download_EC_qexp", label=self.lmfdb_label, limit=1000)),
('Download all stored data', url_for(".download_EC_all", label=self.lmfdb_label)),
('Download Magma code', url_for(".ec_code_download", conductor=cond, iso=iso, number=num, label=self.lmfdb_label, download_type='magma')),
('Download Sage code', url_for(".ec_code_download", conductor=cond, iso=iso, number=num, label=self.lmfdb_label, download_type='sage')),
('Download GP code', url_for(".ec_code_download", conductor=cond, iso=iso, number=num, label=self.lmfdb_label, download_type='gp'))
]
try:
self.plot = encode_plot(self.E.plot())
except AttributeError:
self.plot = encode_plot(EllipticCurve(data['ainvs']).plot())
self.plot_link = '<img src="%s" width="200" height="150"/>' % self.plot
self.properties = [('Label', self.lmfdb_label),
(None, self.plot_link),
('Conductor', '\(%s\)' % data['conductor']),
('Discriminant', '\(%s\)' % data['disc']),
('j-invariant', '%s' % data['j_inv_latex']),
('CM', '%s' % data['CM']),
('Rank', '\(%s\)' % mw['rank']),
('Torsion Structure', '\(%s\)' % mw['tor_struct'])
]
self.title = "Elliptic Curve %s (Cremona label %s)" % (self.lmfdb_label, self.label)
self.bread = [('Elliptic Curves', url_for("ecnf.index")),
('$\Q$', url_for(".rational_elliptic_curves")),
('%s' % N, url_for(".by_conductor", conductor=N)),
('%s' % iso, url_for(".by_double_iso_label", conductor=N, iso_label=iso)),
('%s' % num,' ')]
def code(self):
if self._code == None:
self.make_code_snippets()
return self._code
def make_code_snippets(self):
# read in code.yaml from current directory:
_curdir = os.path.dirname(os.path.abspath(__file__))
self._code = yaml.load(open(os.path.join(_curdir, "code.yaml")))
# Fill in placeholders for this specific curve:
for lang in ['sage', 'pari', 'magma']:
self._code['curve'][lang] = self._code['curve'][lang] % (self.data['ainvs'],self.label)
return
for k in self._code:
if k != 'prompt':
for lang in self._code[k]:
self._code[k][lang] = self._code[k][lang].split("\n")
# remove final empty line
if len(self._code[k][lang][-1])==0:
self._code[k][lang] = self._code[k][lang][:-1]
