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https://github.com/vale981/arb
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47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/*=============================================================================
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2016 Pascal Molin
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******************************************************************************/
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#include "acb_dirichlet.h"
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int
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acb_dirichlet_ui_parity(const acb_dirichlet_group_t G, ulong a)
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{
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slong k;
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int par;
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par = 0;
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if (G->neven && a % 4 == 3)
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par++;
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/* could replace by jacobi(a, core(q_odd)) */
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for (k = G->neven; k < G->num; k++)
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{
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if (n_jacobi_unsigned(a, G->primes[k]) == -1)
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par++;
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}
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return par % 2;
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}
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