Modular Forms for \(\Gamma_1(N)\) and \(\Gamma_H(N)\) over \(\QQ\)¶
EXAMPLES:
sage: M = ModularForms(Gamma1(13),2); M
Modular Forms space of dimension 13 for Congruence Subgroup Gamma1(13) of weight 2 over Rational Field
sage: S = M.cuspidal_submodule(); S
Cuspidal subspace of dimension 2 of Modular Forms space of dimension 13 for Congruence Subgroup Gamma1(13) of weight 2 over Rational Field
sage: S.basis()
[
q - 4*q^3 - q^4 + 3*q^5 + O(q^6),
q^2 - 2*q^3 - q^4 + 2*q^5 + O(q^6)
]
sage: M = ModularForms(GammaH(11, [3])); M
Modular Forms space of dimension 2 for Congruence Subgroup Gamma_H(11) with H generated by [3] of weight 2 over Rational Field
sage: M.q_expansion_basis(8)
[
q - 2*q^2 - q^3 + 2*q^4 + q^5 + 2*q^6 - 2*q^7 + O(q^8),
1 + 12/5*q + 36/5*q^2 + 48/5*q^3 + 84/5*q^4 + 72/5*q^5 + 144/5*q^6 + 96/5*q^7 + O(q^8)
]
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class
sage.modular.modform.ambient_g1.
ModularFormsAmbient_g1_Q
(level, weight, eis_only)¶ Bases:
sage.modular.modform.ambient_g1.ModularFormsAmbient_gH_Q
A space of modular forms for the group \(\Gamma_1(N)\) over the rational numbers.
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cuspidal_submodule
()¶ Return the cuspidal submodule of this modular forms space.
EXAMPLES:
sage: m = ModularForms(Gamma1(17),2); m Modular Forms space of dimension 20 for Congruence Subgroup Gamma1(17) of weight 2 over Rational Field sage: m.cuspidal_submodule() Cuspidal subspace of dimension 5 of Modular Forms space of dimension 20 for Congruence Subgroup Gamma1(17) of weight 2 over Rational Field
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eisenstein_submodule
()¶ Return the Eisenstein submodule of this modular forms space.
EXAMPLES:
sage: ModularForms(Gamma1(13),2).eisenstein_submodule() Eisenstein subspace of dimension 11 of Modular Forms space of dimension 13 for Congruence Subgroup Gamma1(13) of weight 2 over Rational Field sage: ModularForms(Gamma1(13),10).eisenstein_submodule() Eisenstein subspace of dimension 12 of Modular Forms space of dimension 69 for Congruence Subgroup Gamma1(13) of weight 10 over Rational Field
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class
sage.modular.modform.ambient_g1.
ModularFormsAmbient_gH_Q
(group, weight, eis_only)¶ Bases:
sage.modular.modform.ambient.ModularFormsAmbient
A space of modular forms for the group \(\Gamma_H(N)\) over the rational numbers.
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cuspidal_submodule
()¶ Return the cuspidal submodule of this modular forms space.
EXAMPLES:
sage: m = ModularForms(GammaH(100, [29]),2); m Modular Forms space of dimension 48 for Congruence Subgroup Gamma_H(100) with H generated by [29] of weight 2 over Rational Field sage: m.cuspidal_submodule() Cuspidal subspace of dimension 13 of Modular Forms space of dimension 48 for Congruence Subgroup Gamma_H(100) with H generated by [29] of weight 2 over Rational Field
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eisenstein_submodule
()¶ Return the Eisenstein submodule of this modular forms space.
EXAMPLES:
sage: E = ModularForms(GammaH(100, [29]),3).eisenstein_submodule(); E Eisenstein subspace of dimension 24 of Modular Forms space of dimension 72 for Congruence Subgroup Gamma_H(100) with H generated by [29] of weight 3 over Rational Field sage: type(E) <class 'sage.modular.modform.eisenstein_submodule.EisensteinSubmodule_gH_Q_with_category'>
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