14 lines
602 B
Python
14 lines
602 B
Python
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def combination_components(omega, zmag, w):
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'''Given a form omega on AS cover and normal basis element zmag, find the decomposition
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sum_g g(zmag) omega_g and return sum_g g(w) omega_g.'''
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AS = omega.curve
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p = AS.characteristic
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group_elts = [(j1, j2) for j1 in range(p) for j2 in range(p)]
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zvee = dual_elt(AS, zmag)
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result = as_form(AS, 0)
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for i in range(p^2):
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omegai = ith_magical_component(omega, zvee, i)
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aux_fct1 = w.group_action(group_elts[i]).function
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aux_fct2 = omegai.form
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result += as_form(AS, aux_fct1*aux_fct2)
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return result
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