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operate with sign as a boolean

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-05-06 16:44:48 -07:00
parent 6d5fd5d980
commit 495161fe5c
9 changed files with 57 additions and 65 deletions
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12
src/util/lp/nla_order_lemmas.cpp
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@ -209,12 +209,14 @@ bool order::order_lemma_on_ac_and_bc(const monomial& rm_ac,
order_lemma_on_ac_and_bc_and_factors(rm_ac, ac_f[!k], ac_f[k], rm_bd, b);
}
// TBD: document what lemma is created here.
// Here ab is a binary factorization of m.
// We try to find a monomial n = cd, such that |b| = |d|
// and get a lemma m R n & |b| = |d| => ab/|b| R cd /|d|, where R is a relation
void order::order_lemma_on_factorization(const monomial& m, const factorization& ab) {
rational sign = m.rsign();
bool sign = m.rsign();
for (factor f: ab)
sign *= _().canonize_sign(f);
sign ^= _().canonize_sign(f);
const rational fv = val(ab[0]) * val(ab[1]);
const rational mv = sign * val(m);
TRACE("nla_solver",
@ -225,7 +227,7 @@ void order::order_lemma_on_factorization(const monomial& m, const factorization&
bool gt = mv > fv;
TRACE("nla_solver", tout << "m="; _().print_monomial_with_vars(m, tout); tout << "\nfactorization="; _().print_factorization(ab, tout););
for (unsigned j = 0, k = 1; j < 2; j++, k--) {
order_lemma_on_ab(m, sign, var(ab[k]), var(ab[j]), gt);
order_lemma_on_ab(m, sign_to_rat(sign), var(ab[k]), var(ab[j]), gt);
explain(ab); explain(m);
TRACE("nla_solver", _().print_lemma(tout););
order_lemma_on_ac_explore(m, ab, j == 1);
@ -265,7 +267,7 @@ void order::generate_ol(const monomial& ac,
add_empty_lemma();
rational rc_sign = rational(c_sign);
mk_ineq(rc_sign * canonize_sign(c), var(c), llc::LE);
mk_ineq(canonize_sign(ac), var(ac), -canonize_sign(bc), var(bc), ab_cmp);
mk_ineq(canonize_sign(ac), var(ac), !canonize_sign(bc), var(bc), ab_cmp);
mk_ineq(canonize_sign(a)*rc_sign, var(a), - canonize_sign(b)*rc_sign, var(b), negate(ab_cmp));
explain(ac);
explain(a);