def __init__(self, fmodule, degree, name=None, latex_name=None):
r"""
TESTS::
sage: from sage.tensor.modules.ext_pow_free_module import ExtPowerFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: e = M.basis('e')
sage: A = ExtPowerFreeModule(M, 2) ; A
2nd exterior power of the Rank-3 free module M over the
Integer Ring
sage: TestSuite(A).run()
"""
from sage.functions.other import binomial
self._fmodule = fmodule
self._degree = degree
rank = binomial(fmodule._rank, degree)
if name is None and fmodule._name is not None:
name = r'/\^{}('.format(degree) + fmodule._name + ')'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'\Lambda^{' + str(degree) + r'}\left(' + \
fmodule._latex_name + r'\right)'
FiniteRankFreeModule.__init__(self, fmodule._ring, rank,
name=name, latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
# Unique representation:
if self._degree == 1 or \
self._degree in self._fmodule._exterior_powers:
raise ValueError("the {}th exterior power of ".format(degree) +
"{}".format(self._fmodule) +
" has already been created")
else:
self._fmodule._exterior_powers[self._degree] = self
def __init__(self, fmodule, tensor_type, name=None, latex_name=None):
r"""
TESTS::
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: T = M.tensor_module(2, 3)
sage: TestSuite(T).run()
"""
self._fmodule = fmodule
self._tensor_type = tuple(tensor_type)
rank = pow(fmodule._rank, tensor_type[0] + tensor_type[1])
if self._tensor_type == (0, 1): # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = 'T^' + str(self._tensor_type) + '(' + fmodule._name + \
')'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'T^{' + str(self._tensor_type) + r'}\left(' + \
fmodule._latex_name + r'\right)'
FiniteRankFreeModule.__init__(
self,
fmodule._ring,
rank,
name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
fmodule._all_modules.add(self)
def __init__(self, fmodule, degree, name=None, latex_name=None):
r"""
TESTS::
sage: from sage.tensor.modules.ext_pow_free_module import ExtPowerFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: e = M.basis('e')
sage: A = ExtPowerFreeModule(M, 2) ; A
2nd exterior power of the Rank-3 free module M over the
Integer Ring
sage: TestSuite(A).run()
"""
from sage.functions.other import binomial
self._fmodule = fmodule
self._degree = ZZ(degree)
rank = binomial(fmodule._rank, degree)
if name is None and fmodule._name is not None:
name = r'/\^{}('.format(degree) + fmodule._name + ')'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'\Lambda^{' + str(degree) + r'}\left(' + \
fmodule._latex_name + r'\right)'
FiniteRankFreeModule.__init__(
self,
fmodule._ring,
rank,
name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
fmodule._all_modules.add(self)
def __init__(self, vbundle, domain):
r"""
Construct the free module of sections over a trivial part of a vector
bundle.
TESTS::
sage: M = Manifold(3, 'M', structure='top')
sage: X.<x,y,z> = M.chart()
sage: E = M.vector_bundle(2, 'E')
sage: from sage.manifolds.section_module import SectionFreeModule
sage: C0 = SectionFreeModule(E, M); C0
Free module C^0(M;E) of sections on the 3-dimensional topological
manifold M with values in the real vector bundle E of rank 2
sage: C0 is E.section_module(force_free=True)
True
sage: TestSuite(C0).run()
"""
from .scalarfield import ScalarField
self._domain = domain
name = "C^0({};{})".format(domain._name, vbundle._name)
latex_name = r'C^0({};{})'.format(domain._latex_name,
vbundle._latex_name)
base_space = vbundle.base_space()
self._base_space = base_space
self._vbundle = vbundle
cat = Modules(domain.scalar_field_algebra()).FiniteDimensional()
FiniteRankFreeModule.__init__(self, domain.scalar_field_algebra(),
vbundle.rank(), name=name,
latex_name=latex_name,
start_index=base_space._sindex,
output_formatter=ScalarField.coord_function,
category=cat)
def __init__(self, fmodule, degree, name=None, latex_name=None):
r"""
TESTS::
sage: from sage.tensor.modules.ext_pow_free_module import ExtPowerDualFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: e = M.basis('e')
sage: A = ExtPowerDualFreeModule(M, 2) ; A
2nd exterior power of the dual of the Rank-3 free module M over
the Integer Ring
sage: TestSuite(A).run()
"""
from sage.functions.other import binomial
self._fmodule = fmodule
self._degree = degree
rank = binomial(fmodule._rank, degree)
self._zero_element = 0 # provisory (to avoid infinite recursion in what
# follows)
if degree == 1: # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = r'/\^{}('.format(degree) + fmodule._name + '*)'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'\Lambda^{' + str(degree) + r'}\left(' + \
fmodule._latex_name + r'^*\right)'
FiniteRankFreeModule.__init__(
self,
fmodule._ring,
rank,
name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
# Unique representation:
if self._degree in self._fmodule._dual_exterior_powers:
raise ValueError("the {}th exterior power of ".format(degree) +
"the dual of {}".format(self._fmodule) +
" has already been created")
else:
self._fmodule._dual_exterior_powers[self._degree] = self
# Zero element
self._zero_element = self._element_constructor_(name='zero',
latex_name='0')
for basis in self._fmodule._known_bases:
self._zero_element._components[basis] = \
self._zero_element._new_comp(basis)
def stalk(self, point):
"""
Return the stalk of ``self`` at the point ``point``.
INPUT:
- ``point`` -- A point in the domain poset of ``self``.
OUTPUT:
The stalk of ``self`` at ``point``
"""
stalk = FiniteRankFreeModule(self._base_ring, self._stalk_dict[point], name="Stalk of {} at {}".format(self, point))
stalk.basis('e')
return stalk
def __init__(self, fmodule, tensor_type, name=None, latex_name=None):
r"""
TEST::
sage: from sage.tensor.modules.tensor_free_module import TensorFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: T = TensorFreeModule(M, (2,3), name='T23', latex_name=r'T^2_3')
sage: TestSuite(T).run()
"""
self._fmodule = fmodule
self._tensor_type = tuple(tensor_type)
rank = pow(fmodule._rank, tensor_type[0] + tensor_type[1])
self._zero_element = 0 # provisory (to avoid infinite recursion in what
# follows)
if self._tensor_type == (0, 1): # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = 'T^' + str(self._tensor_type) + '(' + fmodule._name + \
')'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'T^{' + str(self._tensor_type) + r'}\left(' + \
fmodule._latex_name + r'\right)'
FiniteRankFreeModule.__init__(
self,
fmodule._ring,
rank,
name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
# Unique representation:
if self._tensor_type in self._fmodule._tensor_modules:
raise ValueError(
"the module of tensors of type {}".format(self._tensor_type) +
" has already been created")
else:
self._fmodule._tensor_modules[self._tensor_type] = self
# Zero element
self._zero_element = self._element_constructor_(name='zero',
latex_name='0')
for basis in self._fmodule._known_bases:
self._zero_element._components[basis] = \
self._zero_element._new_comp(basis)
def __init__(self, fmodule, degree, name=None, latex_name=None):
r"""
TESTS::
sage: from sage.tensor.modules.ext_pow_free_module import ExtPowerDualFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: e = M.basis('e')
sage: A = ExtPowerDualFreeModule(M, 2) ; A
2nd exterior power of the dual of the Rank-3 free module M over
the Integer Ring
sage: TestSuite(A).run()
"""
from sage.functions.other import binomial
self._fmodule = fmodule
self._degree = degree
rank = binomial(fmodule._rank, degree)
self._zero_element = 0 # provisory (to avoid infinite recursion in what
# follows)
if degree == 1: # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = '/\^{}('.format(degree) + fmodule._name + '*)'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'\Lambda^{' + str(degree) + r'}\left(' + \
fmodule._latex_name + r'^*\right)'
FiniteRankFreeModule.__init__(self, fmodule._ring, rank, name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
# Unique representation:
if self._degree in self._fmodule._dual_exterior_powers:
raise ValueError("the {}th exterior power of ".format(degree) +
"the dual of {}".format(self._fmodule) +
" has already been created")
else:
self._fmodule._dual_exterior_powers[self._degree] = self
# Zero element
self._zero_element = self._element_constructor_(name='zero',
latex_name='0')
for basis in self._fmodule._known_bases:
self._zero_element._components[basis] = \
self._zero_element._new_comp(basis)
def __init__(self, fmodule, tensor_type, name=None, latex_name=None):
r"""
TEST::
sage: from sage.tensor.modules.tensor_free_module import TensorFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: T = TensorFreeModule(M, (2,3), name='T23', latex_name=r'T^2_3')
sage: TestSuite(T).run()
"""
self._fmodule = fmodule
self._tensor_type = tuple(tensor_type)
rank = pow(fmodule._rank, tensor_type[0] + tensor_type[1])
self._zero_element = 0 # provisory (to avoid infinite recursion in what
# follows)
if self._tensor_type == (0,1): # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = 'T^' + str(self._tensor_type) + '(' + fmodule._name + \
')'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'T^{' + str(self._tensor_type) + r'}\left(' + \
fmodule._latex_name + r'\right)'
FiniteRankFreeModule.__init__(self, fmodule._ring, rank, name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
# Unique representation:
if self._tensor_type in self._fmodule._tensor_modules:
raise ValueError("the module of tensors of type {}".format(
self._tensor_type) +
" has already been created")
else:
self._fmodule._tensor_modules[self._tensor_type] = self
# Zero element
self._zero_element = self._element_constructor_(name='zero',
latex_name='0')
for basis in self._fmodule._known_bases:
self._zero_element._components[basis] = \
self._zero_element._new_comp(basis)
def __init__(self, fmodule, tensor_type, name=None, latex_name=None):
r"""
TESTS::
sage: from sage.tensor.modules.tensor_free_module import TensorFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: T = TensorFreeModule(M, (2,3), name='T23', latex_name=r'T^2_3')
sage: TestSuite(T).run()
"""
self._fmodule = fmodule
self._tensor_type = tuple(tensor_type)
rank = pow(fmodule._rank, tensor_type[0] + tensor_type[1])
if self._tensor_type == (0, 1): # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = 'T^' + str(self._tensor_type) + '(' + fmodule._name + \
')'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'T^{' + str(self._tensor_type) + r'}\left(' + \
fmodule._latex_name + r'\right)'
FiniteRankFreeModule.__init__(
self,
fmodule._ring,
rank,
name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
# Unique representation:
if self._tensor_type in self._fmodule._tensor_modules:
raise ValueError(
"the module of tensors of type {}".format(self._tensor_type) +
" has already been created")
else:
self._fmodule._tensor_modules[self._tensor_type] = self
def __init__(self, fmodule, degree, name=None, latex_name=None):
r"""
TESTS::
sage: from sage.tensor.modules.ext_pow_free_module import ExtPowerDualFreeModule
sage: M = FiniteRankFreeModule(ZZ, 3, name='M')
sage: e = M.basis('e')
sage: A = ExtPowerDualFreeModule(M, 2) ; A
2nd exterior power of the dual of the Rank-3 free module M over
the Integer Ring
sage: TestSuite(A).run()
"""
from sage.arith.all import binomial
from sage.typeset.unicode_characters import unicode_bigwedge
self._fmodule = fmodule
self._degree = ZZ(degree)
rank = binomial(fmodule._rank, degree)
if degree == 1: # case of the dual
if name is None and fmodule._name is not None:
name = fmodule._name + '*'
if latex_name is None and fmodule._latex_name is not None:
latex_name = fmodule._latex_name + r'^*'
else:
if name is None and fmodule._name is not None:
name = unicode_bigwedge + r'^{}('.format(degree) \
+ fmodule._name + '*)'
if latex_name is None and fmodule._latex_name is not None:
latex_name = r'\Lambda^{' + str(degree) + r'}\left(' \
+ fmodule._latex_name + r'^*\right)'
FiniteRankFreeModule.__init__(
self,
fmodule._ring,
rank,
name=name,
latex_name=latex_name,
start_index=fmodule._sindex,
output_formatter=fmodule._output_formatter)
fmodule._all_modules.add(self)
def __init__(self, point):
r"""
Construct the tangent space at a given point.
TESTS::
sage: from sage.geometry.manifolds.tangentspace import TangentSpace
sage: M = Manifold(2, 'M')
sage: X.<x,y> = M.chart()
sage: p = M.point((1,-2), name='p')
sage: Tp = TangentSpace(p) ; Tp
tangent space at point 'p' on 2-dimensional manifold 'M'
sage: TestSuite(Tp).run()
"""
manif = point._manifold
name = "T_" + str(point._name) + " " + str(manif._name)
latex_name = r"T_{" + str(point._latex_name) + "}\," + \
str(manif._latex_name)
self._point = point
self._manif = manif
FiniteRankFreeModule.__init__(self,
SR,
manif._dim,
name=name,
latex_name=latex_name,
start_index=manif._sindex)
# Initialization of bases of the tangent space from existing vector
# frames around the point:
self._frame_bases = {} # dictionary of bases of the tangent vector
# derived from vector frames (keys: vector
# frames)
for frame in point._subset._top_frames:
if point in frame._domain:
basis = self.basis(symbol=frame._symbol,
latex_symbol=frame._latex_symbol)
# Names of basis vectors set to those of the frame vector
# fields:
n = manif._dim
for i in range(n):
basis._vec[i]._name = frame._vec[i]._name
basis._vec[i]._latex_name = frame._vec[i]._latex_name
basis._name = "(" + \
",".join([basis._vec[i]._name for i in range(n)]) + ")"
basis._latex_name = r"\left(" + \
",".join([basis._vec[i]._latex_name for i in range(n)])+ \
r"\right)"
basis._symbol = basis._name
basis._latex_symbol = basis._latex_name
# Names of cobasis linear forms set to those of the coframe
# 1-forms:
coframe = frame.coframe()
cobasis = basis.dual_basis()
for i in range(n):
cobasis._form[i]._name = coframe._form[i]._name
cobasis._form[i]._latex_name = coframe._form[i]._latex_name
cobasis._name = "(" + \
",".join([cobasis._form[i]._name for i in range(n)]) + ")"
cobasis._latex_name = r"\left(" + \
",".join([cobasis._form[i]._latex_name for i in range(n)])+ \
r"\right)"
self._frame_bases[frame] = basis
# The basis induced by the default frame of the manifold subset
# in which the point has been created is declared the default
# basis of self:
def_frame = point._subset._def_frame
if def_frame in self._frame_bases:
self._def_basis = self._frame_bases[def_frame]
# Initialization of the changes of bases from the existing changes of
# frames around the point:
for frame_pair, automorph in point._subset._frame_changes.iteritems():
frame1 = frame_pair[0]
frame2 = frame_pair[1]
fr1, fr2 = None, None
for frame in self._frame_bases:
if frame1 in frame._subframes:
fr1 = frame
break
for frame in self._frame_bases:
if frame2 in frame._subframes:
fr2 = frame
break
if fr1 is not None and fr2 is not None:
basis1 = self._frame_bases[fr1]
basis2 = self._frame_bases[fr2]
auto = self.automorphism()
for frame, comp in automorph._components.iteritems():
basis = None
if frame is frame1:
basis = basis1
if frame is frame2:
basis = basis2
if basis is not None:
cauto = auto.add_comp(basis)
for ind, val in comp._comp.iteritems():
cauto._comp[ind] = val(point)
self._basis_changes[(basis1, basis2)] = auto
def __init__(self, point):
r"""
Construct the tangent space at a given point.
TESTS::
sage: from sage.manifolds.differentiable.tangent_space import TangentSpace
sage: M = Manifold(2, 'M')
sage: X.<x,y> = M.chart()
sage: p = M.point((1,-2), name='p')
sage: Tp = TangentSpace(p) ; Tp
Tangent space at Point p on the 2-dimensional differentiable
manifold M
sage: TestSuite(Tp).run()
"""
manif = point._manifold
name = "T_{} {}".format(point._name, manif._name)
latex_name = r"T_{%s}\,%s"%(point._latex_name, manif._latex_name)
self._point = point
self._manif = manif
FiniteRankFreeModule.__init__(self, SR, manif._dim, name=name,
latex_name=latex_name,
start_index=manif._sindex)
# Initialization of bases of the tangent space from existing vector
# frames around the point:
# dictionary of bases of the tangent space derived from vector
# frames around the point (keys: vector frames)
self._frame_bases = {}
for frame in point.parent()._top_frames:
# the frame is used to construct a basis of the tangent space
# only if it is a frame on the current manifold:
if frame.destination_map().is_identity():
if point in frame._domain:
coframe = frame.coframe()
basis = self.basis(frame._symbol,
latex_symbol=frame._latex_symbol,
indices=frame._indices,
latex_indices=frame._latex_indices,
symbol_dual=coframe._symbol,
latex_symbol_dual=coframe._latex_symbol)
self._frame_bases[frame] = basis
# The basis induced by the default frame of the manifold subset
# in which the point has been created is declared the default
# basis of self:
def_frame = point.parent()._def_frame
if def_frame in self._frame_bases:
self._def_basis = self._frame_bases[def_frame]
# Initialization of the changes of bases from the existing changes of
# frames around the point:
for frame_pair, automorph in point.parent()._frame_changes.items():
if point in automorph.domain():
frame1, frame2 = frame_pair[0], frame_pair[1]
fr1, fr2 = None, None
for frame in self._frame_bases:
if frame1 in frame._subframes:
fr1 = frame
break
for frame in self._frame_bases:
if frame2 in frame._subframes:
fr2 = frame
break
if fr1 is not None and fr2 is not None:
basis1 = self._frame_bases[fr1]
basis2 = self._frame_bases[fr2]
auto = self.automorphism()
for frame, comp in automorph._components.items():
try:
basis = None
if frame is frame1:
basis = basis1
if frame is frame2:
basis = basis2
if basis is not None:
cauto = auto.add_comp(basis=basis)
for ind, val in comp._comp.items():
cauto._comp[ind] = val(point)
except ValueError:
pass
self._basis_changes[(basis1, basis2)] = auto
def global_sections(self):
"""
Return the global sections of ``self``.
"""
c = self.cohomology(0)
return FiniteRankFreeModule(self._base_ring, c.ngens(), name="Global Sections of {}".format(self))
def __init__(self, vector_bundle, point):
r"""
Construct a fiber of a vector bundle.
TESTS::
sage: M = Manifold(3, 'M', structure='top')
sage: X.<x,y,z> = M.chart()
sage: p = M((0,0,0), name='p')
sage: E = M.vector_bundle(2, 'E')
sage: e = E.local_frame('e')
sage: Ep = E.fiber(p)
sage: TestSuite(Ep).run()
"""
if point._manifold is not vector_bundle._base_space:
raise ValueError("Point must be an element "
"of {}".format(vector_bundle._manifold))
name = "{}_{}".format(vector_bundle._name, point._name)
latex_name = r'{}_{{{}}}'.format(vector_bundle._latex_name,
point._latex_name)
self._rank = vector_bundle._rank
self._vbundle = vector_bundle
self._point = point
self._base_space = point._manifold
FiniteRankFreeModule.__init__(self,
SR,
self._rank,
name=name,
latex_name=latex_name,
start_index=self._base_space._sindex)
###
# Construct basis
self._frame_bases = {
} # dictionary of bases of the vector bundle fiber
# derived from local frames around the point
# (keys: local frames)
self._def_basis = None
for frame in vector_bundle._frames:
# the frame is used to construct a basis of the vector bundle fiber
# only if it is a frame for the given point:
if point in frame.domain():
coframe = frame.coframe()
basis = self.basis(frame._symbol,
latex_symbol=frame._latex_symbol,
indices=frame._indices,
latex_indices=frame._latex_indices,
symbol_dual=coframe._symbol,
latex_symbol_dual=coframe._latex_symbol)
self._frame_bases[frame] = basis
if self._def_basis is None:
self._def_basis = basis # Declare the first basis as default
# Initialization of the changes of bases from the existing changes of
# frames around the point:
for frame_pair, automorph in self._vbundle._frame_changes.items():
if point in automorph._fmodule.domain():
frame1, frame2 = frame_pair[0], frame_pair[1]
fr1, fr2 = None, None
for frame in self._frame_bases:
if frame1 in frame._subframes:
fr1 = frame
break
for frame in self._frame_bases:
if frame2 in frame._subframes:
fr2 = frame
break
if fr1 is not None and fr2 is not None:
basis1 = self._frame_bases[fr1]
basis2 = self._frame_bases[fr2]
auto = self.automorphism()
for frame, comp in automorph._components.items():
try:
basis = None
if frame is frame1:
basis = basis1
if frame is frame2:
basis = basis2
if basis is not None:
cauto = auto.add_comp(basis)
for ind, val in comp._comp.items():
cauto._comp[ind] = val(point)
except ValueError:
pass
self._basis_changes[(basis1, basis2)] = auto
def __init__(self, point):
r"""
Construct the tangent space at a given point.
TESTS::
sage: from sage.manifolds.differentiable.tangent_space import TangentSpace
sage: M = Manifold(2, 'M')
sage: X.<x,y> = M.chart()
sage: p = M.point((1,-2), name='p')
sage: Tp = TangentSpace(p) ; Tp
Tangent space at Point p on the 2-dimensional differentiable
manifold M
sage: TestSuite(Tp).run()
"""
manif = point._manifold
name = "T_{} {}".format(point._name, manif._name)
latex_name = r"T_{%s}\,%s"%(point._latex_name, manif._latex_name)
self._point = point
self._manif = manif
FiniteRankFreeModule.__init__(self, SR, manif._dim, name=name,
latex_name=latex_name,
start_index=manif._sindex)
# Initialization of bases of the tangent space from existing vector
# frames around the point:
# dictionary of bases of the tangent space derived from vector
# frames around the point (keys: vector frames)
self._frame_bases = {}
for frame in point.parent()._top_frames:
# the frame is used to construct a basis of the tangent space
# only if it is a frame on the current manifold:
if frame.destination_map().is_identity():
if point in frame._domain:
basis = self.basis(symbol=frame._symbol,
latex_symbol=frame._latex_symbol)
# Names of basis vectors set to those of the frame vector
# fields:
for i,v in enumerate(frame._vec):
basis._vec[i]._name = v._name
basis._vec[i]._latex_name = v._latex_name
basis._name = "({})".format(
",".join(v._name for v in basis._vec))
basis._latex_name = r"\left({}\right)".format(
",".join(v._latex_name for v in basis._vec))
basis._symbol = basis._name
basis._latex_symbol = basis._latex_name
# Names of cobasis linear forms set to those of the coframe
# 1-forms:
coframe = frame.coframe()
cobasis = basis.dual_basis()
for i,f in enumerate(coframe._form):
cobasis._form[i]._name = f._name
cobasis._form[i]._latex_name = f._latex_name
cobasis._name = "({})".format(
",".join(f._name for f in cobasis._form))
cobasis._latex_name = r"\left({}\right)".format(
",".join(f._latex_name for f in cobasis._form))
self._frame_bases[frame] = basis
# The basis induced by the default frame of the manifold subset
# in which the point has been created is declared the default
# basis of self:
def_frame = point.parent()._def_frame
if def_frame in self._frame_bases:
self._def_basis = self._frame_bases[def_frame]
# Initialization of the changes of bases from the existing changes of
# frames around the point:
for frame_pair, automorph in point.parent()._frame_changes.items():
if point in automorph.domain():
frame1, frame2 = frame_pair[0], frame_pair[1]
fr1, fr2 = None, None
for frame in self._frame_bases:
if frame1 in frame._subframes:
fr1 = frame
break
for frame in self._frame_bases:
if frame2 in frame._subframes:
fr2 = frame
break
if fr1 is not None and fr2 is not None:
basis1 = self._frame_bases[fr1]
basis2 = self._frame_bases[fr2]
auto = self.automorphism()
for frame, comp in automorph._components.items():
try:
basis = None
if frame is frame1:
basis = basis1
if frame is frame2:
basis = basis2
if basis is not None:
cauto = auto.add_comp(basis)
for ind, val in comp._comp.items():
cauto._comp[ind] = val(point)
except ValueError:
pass
self._basis_changes[(basis1, basis2)] = auto