mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-10-31 19:52:29 +00:00
Code Activity

port Grobner

Browse source 
Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2019-10-22 17:36:47 -07:00
parent 3fd853752b
commit ba2b1ea929
2 changed files with 35 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

36
src/math/lp/nla_grobner.cpp
View file

@ -488,7 +488,38 @@ void nla_grobner::simplify_to_process(equation* eq) {
del_equation(eq);
}
// let e1: alpha*ab+q=0, and e2: beta*ac+e=0, then beta*qc - alpha*eb = 0
nex * nla_grobner::expr_superpose(nex* e1, nex* e2, nex_mul* ab, nex_mul* ac, nex_mul* b, nex_mul* c) {
TRACE("grobner", tout << "e1 = " << *e1 << "\ne2 = " << *e2 <<"\n";);
nex_sum * r = m_nex_creator.mk_sum();
rational alpha = - ab->coeff();
TRACE("grobner", tout << "e2 *= " << alpha << "*(" << *b << ")\n";);
if (e2->is_sum()) {
nex_sum *e2s = to_sum(e2);
for (unsigned j = 1; j < e2s->size(); j++) {
r->add_child(m_nex_creator.mk_mul(alpha, (*e2s)[j], b));
}
TRACE("grobner", tout << "r = " << *r << "\n";);
} else {
NOT_IMPLEMENTED_YET();
}
rational beta = ac->coeff();
TRACE("grobner", tout << "e1 *= " << beta << "*(" << *c << ")\n";);
if (e1->is_sum()) {
nex_sum *e1s = to_sum(e1);
for (unsigned j = 1; j < e1s->size(); j++) {
r->add_child(m_nex_creator.mk_mul(beta, (*e1s)[j], c));
}
TRACE("grobner", tout << "r = " << *r << "\n";);
} else {
NOT_IMPLEMENTED_YET();
}
nex * ret = m_nex_creator.simplify(r);
TRACE("grobner", tout << "e1 = " << *e1 << "\ne2 = " << *e2 <<"\nsuperpose = " << *ret << "\n";);
return ret;
}
// let eq1: ab+q=0, and eq2: ac+e=0, then qc - eb = 0
void nla_grobner::superpose(equation * eq1, equation * eq2) {
TRACE("grobner", tout << "eq1="; display_equation(tout, *eq1) << "eq2="; display_equation(tout, *eq2););
@ -499,8 +530,9 @@ void nla_grobner::superpose(equation * eq1, equation * eq2) {
if (!find_b_c(ab, ac, b, c)) {
return;
}
NOT_IMPLEMENTED_YET();
// insert_to_
equation* eq = new equation(); // to do - need no remove !!!!!!!!!!!!!!!!!!!
init_equation(eq, expr_superpose( eq1->exp(), eq2->exp(), ab, ac, b, c), m_dep_manager.mk_join(eq1->dep(), eq2->dep()));
insert_to_simplify(eq);
}
bool nla_grobner::find_b_c(nex_mul*ab, nex_mul* ac, nex_mul*& b, nex_mul*& c) {