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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | // reduce.h: declaration of quartic reduction functions
//////////////////////////////////////////////////////////////////////////
//
// Copyright 1990-2012 John Cremona
//
// This file is part of the eclib package.
//
// eclib is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or (at your
// option) any later version.
//
// eclib is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eclib; if not, write to the Free Software Foundation,
// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
//
//////////////////////////////////////////////////////////////////////////
// NB In both functions, the unimod m must hold the cumulative
// transformation on entry. It will be updated to show the new
// cumulative transformation
// Full reduction via covariant quadratic:
void reduce(bigint& a, bigint& b, bigint& c, bigint& d, bigint& e,
unimod& m);
// Simple shift to minimise b:
void reduce_b(bigint& a, bigint& b, bigint& c, bigint& d, bigint& e,
unimod& m);
// Compute the quadratic covariant of a real quartic:
bigfloat* quadratic_covariant(bigint& a, bigint& b, bigint& c, bigint& d, bigint& e);
// Given a pos. def. quadratic x^2+b*x+c, returns a unimod which
// reduces it (whose inverse takes its root into the fundamental
// region).
unimod reduce_quad(const bigfloat& b, const bigfloat& c);
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