def __init__(self, R, n, names):
"""
The free algebra on `n` generators over a base ring.
INPUT:
- ``R`` - ring
- ``n`` - an integer
- ``names`` - generator names
EXAMPLES::
sage: F.<x,y,z> = FreeAlgebra(QQ, 3); F # indirect doctet
Free Algebra on 3 generators (x, y, z) over Rational Field
TEST:
Note that the following is *not* the recommended way to create
a free algebra.
::
sage: from sage.algebras.free_algebra import FreeAlgebra_generic
sage: FreeAlgebra_generic(ZZ,3,'abc')
Free Algebra on 3 generators (a, b, c) over Integer Ring
"""
if not isinstance(R, Ring):
raise TypeError("Argument R must be a ring.")
self.__monoid = FreeMonoid(n, names=names)
self.__ngens = n
#sage.structure.parent_gens.ParentWithGens.__init__(self, R, names)
Algebra.__init__(self, R, names=names)
def __init__(self, R, n, names):
"""
The free algebra on `n` generators over a base ring.
INPUT:
- ``R`` - ring
- ``n`` - an integer
- ``names`` - generator names
EXAMPLES::
sage: F.<x,y,z> = FreeAlgebra(QQ, 3); F # indirect doctet
Free Algebra on 3 generators (x, y, z) over Rational Field
TEST:
Note that the following is *not* the recommended way to create
a free algebra.
::
sage: from sage.algebras.free_algebra import FreeAlgebra_generic
sage: FreeAlgebra_generic(ZZ,3,'abc')
Free Algebra on 3 generators (a, b, c) over Integer Ring
"""
if not isinstance(R, Ring):
raise TypeError("Argument R must be a ring.")
self.__ngens = n
#sage.structure.parent_gens.ParentWithGens.__init__(self, R, names)
self._basis_keys = FreeMonoid(n, names=names)
Algebra.__init__(self, R, names, category=AlgebrasWithBasis(R))
def __init__(self, coeff_ring=ZZ, group='Sp(4,Z)', weights='even', degree=2, default_prec=SMF_DEFAULT_PREC):
r"""
Initialize an algebra of Siegel modular forms of degree ``degree``
with coefficients in ``coeff_ring``, on the group ``group``.
If ``weights`` is 'even', then only forms of even weights are
considered; if ``weights`` is 'all', then all forms are
considered.
EXAMPLES::
sage: A = SiegelModularFormsAlgebra(QQ)
sage: B = SiegelModularFormsAlgebra(ZZ)
sage: A._coerce_map_from_(B)
True
sage: B._coerce_map_from_(A)
False
sage: A._coerce_map_from_(ZZ)
True
"""
self.__coeff_ring = coeff_ring
self.__group = group
self.__weights = weights
self.__degree = degree
self.__default_prec = default_prec
R = coeff_ring
from sage.algebras.all import GroupAlgebra
if isinstance(R, GroupAlgebra):
R = R.base_ring()
from sage.rings.polynomial.polynomial_ring import is_PolynomialRing
if is_PolynomialRing(R):
self.__base_ring = R.base_ring()
else:
self.__base_ring = R
from sage.categories.all import Algebras
Algebra.__init__(self, base=self.__base_ring, category=Algebras(self.__base_ring))
def __init__(self, A, S) :
r"""
INPUT:
- `A` -- A ring.
- `S` -- A monoid as implemented in :class:~`fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids.NNMonoid`.
TESTS::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import MonoidPowerSeriesRing_generic
sage: mps = MonoidPowerSeriesRing_generic(QQ, NNMonoid(False))
sage: mps = MonoidPowerSeriesRing_generic(ZZ, NNMonoid(False))
sage: mps.base_ring()
Integer Ring
sage: (1 / 2) * mps.0
Monoid power series in Ring of monoid power series over NN
"""
Algebra.__init__(self, A)
MonoidPowerSeriesAmbient_abstract.__init__(self, A, S)
self.__monoid_gens = \
[ self._element_class(self, dict([(s, A.one_element())]),
self.monoid().filter_all() )
for s in S.gens() ]
from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_functor import MonoidPowerSeriesBaseRingInjection
self._populate_coercion_lists_(
coerce_list = [MonoidPowerSeriesBaseRingInjection(self.base_ring(), self)] + \
([S] if isinstance(S, Parent) else []) )
def _coerce_map_from_(self, other) :
"""
TESTS::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_module import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import *
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import DegreeGrading
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ring import *
sage: mps = MonoidPowerSeriesRing(QQ, NNMonoid(False))
sage: ger = GradedExpansionRing_class(Sequence([MonoidPowerSeries(mps, {1: 1}, mps.monoid().filter(4))]), Sequence([MonoidPowerSeries(mps, {1: 1, 2: 3}, mps.monoid().filter(4))]), PolynomialRing(QQ, ['a', 'b']).ideal(0), DegreeGrading((1,2)))
sage: ger._coerce_map_from_(ZZ)
"""
if other is self.relations().ring() :
from sage.structure.coerce_maps import CallableConvertMap
return CallableConvertMap(other, self, self._element_constructor_)
if isinstance(other, GradedExpansionSubmodule_abstract) :
if other.graded_ambient() is self \
or self.has_coerce_map_from(other.graded_ambient()) :
from sage.structure.coerce_maps import CallableConvertMap
return CallableConvertMap(other, self, other._graded_expansion_submodule_to_graded_ambient_)
return Algebra._coerce_map_from_(self, other)
def _coerce_map_from_(self, other) :
r"""
TESTS::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_module import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import *
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import DegreeGrading
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ring import *
sage: mps = MonoidPowerSeriesRing(QQ, NNMonoid(False))
sage: ger = GradedExpansionRing_class(Sequence([MonoidPowerSeries(mps, {1: 1}, mps.monoid().filter(4))]), Sequence([MonoidPowerSeries(mps, {1: 1, 2: 3}, mps.monoid().filter(4))]), PolynomialRing(QQ, ['a', 'b']).ideal(0), DegreeGrading((1,2)))
sage: ger._coerce_map_from_(ZZ)
"""
if other is self.relations().ring() :
from sage.structure.coerce_maps import CallableConvertMap
return CallableConvertMap(other, self, self._element_constructor_)
if isinstance(other, GradedExpansionSubmodule_abstract) :
if other.graded_ambient() is self \
or self.has_coerce_map_from(other.graded_ambient()) :
from sage.structure.coerce_maps import CallableConvertMap
return CallableConvertMap(other, self, other._graded_expansion_submodule_to_graded_ambient_)
return Algebra._coerce_map_from_(self, other)
def __init__(self, O, C, R):
r"""
INPUT:
- `O` -- A monoid with an action of a group; As implemented in
:class:~`fourier_expansion_framework.monoidpowerseries.NNMonoid`.
- `C` -- A monoid of characters; As implemented in ::class:~`fourier_expansion_framework.monoidpowerseries.CharacterMonoid_class`.
- `R` -- A representation on an algebra; As implemented
in :class:~`fourier_expansion_framework.monoidpowerseries.TrivialRepresentation`.
EXAMPLES::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import EquivariantMonoidPowerSeriesRing_generic
sage: emps = EquivariantMonoidPowerSeriesRing_generic(NNMonoid(True), TrivialCharacterMonoid("1", QQ), TrivialRepresentation("1", QQ)) # indirect doctest
sage: emps = EquivariantMonoidPowerSeriesRing_generic(NNMonoid(True), TrivialCharacterMonoid("1", ZZ), TrivialRepresentation("1", ZZ)) # indirect doctest
sage: emps.base_ring()
Integer Ring
sage: (1 / 2) * emps.0
Equivariant monoid power series in Ring of equivariant monoid power series over NN
"""
Algebra.__init__(self, R.base_ring())
EquivariantMonoidPowerSeriesAmbient_abstract.__init__(self, O, C, R)
self.__monoid_gens = \
[self._element_class(self,
dict([( C.one_element(), dict([(s, self.coefficient_domain().one_element())]) )]),
self.monoid().filter_all() )
for s in self.action().gens()]
self.__character_gens = \
[self._element_class(self,
dict([( c, dict([(self.monoid().zero_element(), self.coefficient_domain().one_element())]) )]),
self.monoid().filter_all() )
for c in C.gens()]
self.__coefficient_gens = \
[self._element_class(self,
dict([( C.one_element(), dict([(self.monoid().zero_element(), g)]))]),
self.monoid().filter_all() )
for g in self.coefficient_domain().gens()]
from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_functor import MonoidPowerSeriesBaseRingInjection
self._populate_coercion_lists_(
coerce_list=[
MonoidPowerSeriesBaseRingInjection(R.codomain(), self)
],
convert_list=([O.monoid()]
if isinstance(O.monoid(), Parent) else []))
def __init__(self, O, C, R) :
r"""
INPUT:
- `O` -- A monoid with an action of a group; As implemented in
:class:~`fourier_expansion_framework.monoidpowerseries.NNMonoid`.
- `C` -- A monoid of characters; As implemented in ::class:~`fourier_expansion_framework.monoidpowerseries.CharacterMonoid_class`.
- `R` -- A representation on an algebra; As implemented
in :class:~`fourier_expansion_framework.monoidpowerseries.TrivialRepresentation`.
EXAMPLES::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import EquivariantMonoidPowerSeriesRing_generic
sage: emps = EquivariantMonoidPowerSeriesRing_generic(NNMonoid(True), TrivialCharacterMonoid("1", QQ), TrivialRepresentation("1", QQ)) # indirect doctest
sage: emps = EquivariantMonoidPowerSeriesRing_generic(NNMonoid(True), TrivialCharacterMonoid("1", ZZ), TrivialRepresentation("1", ZZ)) # indirect doctest
sage: emps.base_ring()
Integer Ring
sage: (1 / 2) * emps.0
Equivariant monoid power series in Ring of equivariant monoid power series over NN
"""
Algebra.__init__(self, R.base_ring())
EquivariantMonoidPowerSeriesAmbient_abstract.__init__(self, O, C, R)
self.__monoid_gens = \
[self._element_class(self,
dict([( C.one_element(), dict([(s, self.coefficient_domain().one_element())]) )]),
self.monoid().filter_all() )
for s in self.action().gens()]
self.__character_gens = \
[self._element_class(self,
dict([( c, dict([(self.monoid().zero_element(), self.coefficient_domain().one_element())]) )]),
self.monoid().filter_all() )
for c in C.gens()]
self.__coefficient_gens = \
[self._element_class(self,
dict([( C.one_element(), dict([(self.monoid().zero_element(), g)]))]),
self.monoid().filter_all() )
for g in self.coefficient_domain().gens()]
from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_functor import MonoidPowerSeriesBaseRingInjection
self._populate_coercion_lists_(
coerce_list = [MonoidPowerSeriesBaseRingInjection(R.codomain(), self)] ,
convert_list = ([O.monoid()] if isinstance(O.monoid(), Parent) else []) )
def __init__(self,
coeff_ring=ZZ,
group='Sp(4,Z)',
weights='even',
degree=2,
default_prec=SMF_DEFAULT_PREC):
r"""
Initialize an algebra of Siegel modular forms of degree ``degree``
with coefficients in ``coeff_ring``, on the group ``group``.
If ``weights`` is 'even', then only forms of even weights are
considered; if ``weights`` is 'all', then all forms are
considered.
EXAMPLES::
sage: A = SiegelModularFormsAlgebra(QQ)
sage: B = SiegelModularFormsAlgebra(ZZ)
sage: A._coerce_map_from_(B)
True
sage: B._coerce_map_from_(A)
False
sage: A._coerce_map_from_(ZZ)
True
"""
self.__coeff_ring = coeff_ring
self.__group = group
self.__weights = weights
self.__degree = degree
self.__default_prec = default_prec
R = coeff_ring
from sage.algebras.all import GroupAlgebra
if isinstance(R, GroupAlgebra):
R = R.base_ring()
from sage.rings.polynomial.polynomial_ring import is_PolynomialRing
if is_PolynomialRing(R):
self.__base_ring = R.base_ring()
else:
self.__base_ring = R
from sage.categories.all import Algebras
Algebra.__init__(self,
base=self.__base_ring,
category=Algebras(self.__base_ring))
def __init__(self, R, n, names):
"""
The free algebra on `n` generators over a base ring.
INPUT:
- ``R`` - ring
- ``n`` - an integer
- ``names`` - generator names
EXAMPLES::
sage: F.<x,y,z> = FreeAlgebra(QQ, 3); F # indirect doctet
Free Algebra on 3 generators (x, y, z) over Rational Field
"""
if not isinstance(R, Ring):
raise TypeError("Argument R must be a ring.")
self.__monoid = FreeMonoid(n, names=names)
self.__ngens = n
#sage.structure.parent_gens.ParentWithGens.__init__(self, R, names)
Algebra.__init__(self, R, names=names)
def __init__(self, R, n, names):
"""
The free algebra on `n` generators over a base ring.
INPUT:
- ``R`` - ring
- ``n`` - an integer
- ``names`` - generator names
EXAMPLES::
sage: F.<x,y,z> = FreeAlgebra(QQ, 3); F # indirect doctet
Free Algebra on 3 generators (x, y, z) over Rational Field
"""
if not isinstance(R, Ring):
raise TypeError, "Argument R must be a ring."
self.__monoid = FreeMonoid(n, names=names)
self.__ngens = n
#sage.structure.parent_gens.ParentWithGens.__init__(self, R, names)
Algebra.__init__(self, R,names=names)
def __init__(self, A, mons, mats, names):
"""
Returns a quotient algebra defined via the action of a free algebra
A on a (finitely generated) free module. The input for the quotient
algebra is a list of monomials (in the underlying monoid for A)
which form a free basis for the module of A, and a list of
matrices, which give the action of the free generators of A on this
monomial basis.
EXAMPLES:
Quaternion algebra defined in terms of three generators::
sage: n = 3
sage: A = FreeAlgebra(QQ,n,'i')
sage: F = A.monoid()
sage: i, j, k = F.gens()
sage: mons = [ F(1), i, j, k ]
sage: M = MatrixSpace(QQ,4)
sage: mats = [M([0,1,0,0, -1,0,0,0, 0,0,0,-1, 0,0,1,0]), M([0,0,1,0, 0,0,0,1, -1,0,0,0, 0,-1,0,0]), M([0,0,0,1, 0,0,-1,0, 0,1,0,0, -1,0,0,0]) ]
sage: H3.<i,j,k> = FreeAlgebraQuotient(A,mons,mats)
sage: x = 1 + i + j + k
sage: x
1 + i + j + k
sage: x**128
-170141183460469231731687303715884105728 + 170141183460469231731687303715884105728*i + 170141183460469231731687303715884105728*j + 170141183460469231731687303715884105728*k
Same algebra defined in terms of two generators, with some penalty
on already slow arithmetic.
::
sage: n = 2
sage: A = FreeAlgebra(QQ,n,'x')
sage: F = A.monoid()
sage: i, j = F.gens()
sage: mons = [ F(1), i, j, i*j ]
sage: r = len(mons)
sage: M = MatrixSpace(QQ,r)
sage: mats = [M([0,1,0,0, -1,0,0,0, 0,0,0,-1, 0,0,1,0]), M([0,0,1,0, 0,0,0,1, -1,0,0,0, 0,-1,0,0]) ]
sage: H2.<i,j> = A.quotient(mons,mats)
sage: k = i*j
sage: x = 1 + i + j + k
sage: x
1 + i + j + i*j
sage: x**128
-170141183460469231731687303715884105728 + 170141183460469231731687303715884105728*i + 170141183460469231731687303715884105728*j + 170141183460469231731687303715884105728*i*j
TEST::
sage: TestSuite(H2).run()
"""
if not is_FreeAlgebra(A):
raise TypeError, "Argument A must be an algebra."
R = A.base_ring()
# if not R.is_field(): # TODO: why?
# raise TypeError, "Base ring of argument A must be a field."
n = A.ngens()
assert n == len(mats)
self.__free_algebra = A
self.__ngens = n
self.__dim = len(mons)
self.__module = FreeModule(R, self.__dim)
self.__matrix_action = mats
self.__monomial_basis = mons # elements of free monoid
Algebra.__init__(self, R, names, normalize=True)
def __init__ ( self, base_ring_generators, generators,
relations, grading, all_relations = True, reduce_before_evaluating = True) :
"""
The degree one part of the monomials that correspond to generators over the
base expansion ring will serve as the coordinates of the elements.
INPUT:
- ``base_ring_generators`` -- A list of (equivariant) monoid power series with
coefficient domain the base ring of the coefficient
domain of the generators or ``None``.
- ``generators`` -- A list of (equivariant) monoid power series; The generators
of the ambient over the ring generated by the base ring
generators.
- ``relations`` -- An ideal in a polynomial ring with ``len(base_ring_generators) + len(generators)``
variables.
- ``grading`` -- A grading deriving from :class:~`fourier_expansion_framework.gradedexpansions.gradedexpansion_grading`;
A grading for the polynomial ring of the relations.
- ``all_relations`` -- A boolean (default: ``True``); If ``True`` the relations given
for the polynomial ring are all relations that the Fourier
expansion have.
- ``reduce_before_evaluating`` -- A boolean (default: ``True``); If ``True`` any monomial
will be Groebner reduced before the Fourier expansion
is calculated.
NOTE:
The grading must respect the relations of the generators.
TESTS::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import *
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import DegreeGrading
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ring import *
sage: mps = MonoidPowerSeriesRing(QQ, NNMonoid(False))
sage: ger = GradedExpansionRing_class(Sequence([MonoidPowerSeries(mps, {1: 1}, mps.monoid().filter(4))]), Sequence([MonoidPowerSeries(mps, {1: 1, 2: 3}, mps.monoid().filter(4))]), PolynomialRing(QQ, ['a', 'b']).ideal(0), DegreeGrading((1,2)))
sage: ger.base_ring()
Graded expansion ring with generators a
"""
if not hasattr(self, '_element_class') :
self._element_class = GradedExpansion_class
if hasattr(self, "_extended_base_ring") :
Algebra.__init__(self, self._extended_base_ring)
elif base_ring_generators is None or len(base_ring_generators) == 0 :
Algebra.__init__(self, relations.base_ring())
else :
gb = filter( lambda p: all( all(a == 0 for a in list(e)[len(base_ring_generators):])
for e in p.exponents() ),
relations.groebner_basis() )
P = PolynomialRing( relations.base_ring(),
list(relations.ring().variable_names())[:len(base_ring_generators)] )
base_relations = P.ideal(gb)
R = GradedExpansionRing_class(None, base_ring_generators, base_relations,
grading.subgrading(xrange(len(base_ring_generators))), all_relations, reduce_before_evaluating)
Algebra.__init__(self, R)
GradedExpansionAmbient_abstract.__init__(self, base_ring_generators, generators, relations, grading, all_relations, reduce_before_evaluating)
self._populate_coercion_lists_(
coerce_list = [GradedExpansionBaseringInjection(self.base_ring(), self)],
convert_list = [self.relations().ring()],
convert_method_name = "_graded_expansion_submodule_to_graded_ambient_" )
def __init__(self, A, mons, mats, names):
"""
Returns a quotient algebra defined via the action of a free algebra
A on a (finitely generated) free module. The input for the quotient
algebra is a list of monomials (in the underlying monoid for A)
which form a free basis for the module of A, and a list of
matrices, which give the action of the free generators of A on this
monomial basis.
EXAMPLES:
Quaternion algebra defined in terms of three generators::
sage: n = 3
sage: A = FreeAlgebra(QQ,n,'i')
sage: F = A.monoid()
sage: i, j, k = F.gens()
sage: mons = [ F(1), i, j, k ]
sage: M = MatrixSpace(QQ,4)
sage: mats = [M([0,1,0,0, -1,0,0,0, 0,0,0,-1, 0,0,1,0]), M([0,0,1,0, 0,0,0,1, -1,0,0,0, 0,-1,0,0]), M([0,0,0,1, 0,0,-1,0, 0,1,0,0, -1,0,0,0]) ]
sage: H3.<i,j,k> = FreeAlgebraQuotient(A,mons,mats)
sage: x = 1 + i + j + k
sage: x
1 + i + j + k
sage: x**128
-170141183460469231731687303715884105728 + 170141183460469231731687303715884105728*i + 170141183460469231731687303715884105728*j + 170141183460469231731687303715884105728*k
Same algebra defined in terms of two generators, with some penalty
on already slow arithmetic.
::
sage: n = 2
sage: A = FreeAlgebra(QQ,n,'x')
sage: F = A.monoid()
sage: i, j = F.gens()
sage: mons = [ F(1), i, j, i*j ]
sage: r = len(mons)
sage: M = MatrixSpace(QQ,r)
sage: mats = [M([0,1,0,0, -1,0,0,0, 0,0,0,-1, 0,0,1,0]), M([0,0,1,0, 0,0,0,1, -1,0,0,0, 0,-1,0,0]) ]
sage: H2.<i,j> = A.quotient(mons,mats)
sage: k = i*j
sage: x = 1 + i + j + k
sage: x
1 + i + j + i*j
sage: x**128
-170141183460469231731687303715884105728 + 170141183460469231731687303715884105728*i + 170141183460469231731687303715884105728*j + 170141183460469231731687303715884105728*i*j
TEST::
sage: TestSuite(H2).run()
"""
if not is_FreeAlgebra(A):
raise TypeError("Argument A must be an algebra.")
R = A.base_ring()
# if not R.is_field(): # TODO: why?
# raise TypeError, "Base ring of argument A must be a field."
n = A.ngens()
assert n == len(mats)
self.__free_algebra = A
self.__ngens = n
self.__dim = len(mons)
self.__module = FreeModule(R,self.__dim)
self.__matrix_action = mats
self.__monomial_basis = mons # elements of free monoid
Algebra.__init__(self, R, names, normalize=True)
def __init__ ( self, base_ring_generators, generators,
relations, grading, all_relations = True, reduce_before_evaluating = True) :
r"""
The degree one part of the monomials that correspond to generators over the
base expansion ring will serve as the coordinates of the elements.
INPUT:
- ``base_ring_generators`` -- A list of (equivariant) monoid power series with
coefficient domain the base ring of the coefficient
domain of the generators or ``None``.
- ``generators`` -- A list of (equivariant) monoid power series; The generators
of the ambient over the ring generated by the base ring
generators.
- ``relations`` -- An ideal in a polynomial ring with ``len(base_ring_generators) + len(generators)``
variables.
- ``grading`` -- A grading deriving from :class:~`fourier_expansion_framework.gradedexpansions.gradedexpansion_grading`;
A grading for the polynomial ring of the relations.
- ``all_relations`` -- A boolean (default: ``True``); If ``True`` the relations given
for the polynomial ring are all relations that the Fourier
expansion have.
- ``reduce_before_evaluating`` -- A boolean (default: ``True``); If ``True`` any monomial
will be Groebner reduced before the Fourier expansion
is calculated.
NOTE:
The grading must respect the relations of the generators.
TESTS::
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_basicmonoids import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_ring import *
sage: from psage.modform.fourier_expansion_framework.monoidpowerseries.monoidpowerseries_element import *
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_grading import DegreeGrading
sage: from psage.modform.fourier_expansion_framework.gradedexpansions.gradedexpansion_ring import *
sage: mps = MonoidPowerSeriesRing(QQ, NNMonoid(False))
sage: ger = GradedExpansionRing_class(Sequence([MonoidPowerSeries(mps, {1: 1}, mps.monoid().filter(4))]), Sequence([MonoidPowerSeries(mps, {1: 1, 2: 3}, mps.monoid().filter(4))]), PolynomialRing(QQ, ['a', 'b']).ideal(0), DegreeGrading((1,2)))
sage: ger.base_ring()
Graded expansion ring with generators a
"""
if not hasattr(self, '_element_class') :
self._element_class = GradedExpansion_class
if hasattr(self, "_extended_base_ring") :
Algebra.__init__(self, self._extended_base_ring)
elif base_ring_generators is None or len(base_ring_generators) == 0 :
Algebra.__init__(self, relations.base_ring())
else :
gb = [p for p in relations.groebner_basis() if all( all(a == 0 for a in list(e)[len(base_ring_generators):])
for e in p.exponents() )]
P = PolynomialRing( relations.base_ring(),
list(relations.ring().variable_names())[:len(base_ring_generators)] )
base_relations = P.ideal(gb)
R = GradedExpansionRing_class(None, base_ring_generators, base_relations,
grading.subgrading(range(len(base_ring_generators))), all_relations, reduce_before_evaluating)
Algebra.__init__(self, R)
GradedExpansionAmbient_abstract.__init__(self, base_ring_generators, generators, relations, grading, all_relations, reduce_before_evaluating)
self._populate_coercion_lists_(
coerce_list = [GradedExpansionBaseringInjection(self.base_ring(), self)],
# This is deactivated since it leads to errors in the coercion system for Sage 4.8
# TODO: Find out why
# convert_list = [self.relations().ring()],
convert_list = [],
convert_method_name = "_graded_expansion_submodule_to_graded_ambient_" )