def modular_symbols(self):
"""
Return the space of modular symbols used for computing this
set of modular eigenforms.
EXAMPLES::
sage: n = numerical_eigenforms(61) ; n.modular_symbols()
Modular Symbols space of dimension 5 for Gamma_0(61) of weight 2 with sign 1 over Rational Field
"""
M = ModularSymbols(self._group, self._weight, sign=1)
if M.base_ring() != QQ:
raise ValueError("modular forms space must be defined over QQ")
return M
def modular_symbols(self):
"""
Return the space of modular symbols used for computing this
set of modular eigenforms.
EXAMPLES::
sage: n = numerical_eigenforms(61) ; n.modular_symbols()
Modular Symbols space of dimension 5 for Gamma_0(61) of weight 2 with sign 1 over Rational Field
"""
try:
return self.__modular_symbols
except AttributeError:
M = ModularSymbols(self._group,
self._weight, sign=1)
if M.base_ring() != QQ:
raise ValueError("modular forms space must be defined over QQ")
self.__modular_symbols = M
return M
