mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-10-31 11:42:28 +00:00
Code Activity

fix nla_monotone lemmas again

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-16 17:26:09 -07:00
parent 3147be66fe
commit b2bfb1faea
1 changed files with 6 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/math/lp/nla_monotone_lemmas.cpp
View file

@ -49,7 +49,7 @@ void monotone::monotonicity_lemma(monic const& m) {
Example:
x <= -2 & y >= 3 => x*y <= -6
0 >= x >= -2 & 0 <= y <= 3 => x*y >= -6
*/
void monotone::monotonicity_lemma_gt(const monic& m) {
@ -58,6 +58,7 @@ void monotone::monotonicity_lemma_gt(const monic& m) {
for (lpvar j : m.vars()) {
auto v = c().val(j);
lemma |= ineq(j, v.is_neg() ? llc::LT : llc::GT, v);
lemma |= ineq(j, v.is_neg() ? llc::GT : llc::LT, 0);
product *= v;
}
lemma |= ineq(m.var(), product.is_neg() ? llc::GE : llc::LE, product);
@ -68,6 +69,10 @@ void monotone::monotonicity_lemma_gt(const monic& m) {
/\_i |m[i]| >= |val(m[i])| => |m| >= |product_i val(m[i])|
<=>
\/_i |m[i]| < |val(m[i])| or |m| >= |product_i val(m[i])|
Example:
x <= -2 & y >= 3 => x*y <= -6
*/
void monotone::monotonicity_lemma_lt(const monic& m) {
new_lemma lemma(c(), __FUNCTION__);