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28 lines
621 B
C
28 lines
621 B
C
/*
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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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int
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dirichlet_parity_ui(const dirichlet_group_t G, ulong a)
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{
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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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if (n_jacobi_unsigned(a, G->rad_q) == -1)
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par++;
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return par % 2;
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}
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