mirror of
https://github.com/vale981/arb
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37 lines
967 B
C
37 lines
967 B
C
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/*
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Copyright (C) 2016 Pascal Molin
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This file is part of Arb.
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Arb is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "dirichlet.h"
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void
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dirichlet_char_lift(dirichlet_char_t y, const dirichlet_group_t G, const dirichlet_char_t x, const dirichlet_group_t H)
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{
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slong k, l;
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if (G->q % H->q != 0)
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{
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flint_printf("conrey_lift: lower modulus %wu does not divide %wu\n", H->q, G->q);
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abort();
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}
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for (k = 0, l = 0; k < G->num && l < H->num; k++)
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{
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if (G->P[k].p == H->P[l].p)
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{
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slong e = n_pow(G->P[k].p, G->P[k].e - H->P[l].e);
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y->log[k] = x->log[l] * e;
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l++;
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}
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}
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dirichlet_char_exp(y, G);
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}
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