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add completion (introducing negative root function symbols) to address regression introduced when fixing unsound handling of negative roots

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2015-12-16 00:49:06 +02:00
parent 90b1b07af4
commit ee0dbf34f0
2 changed files with 4 additions and 5 deletions
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8
src/tactic/arith/purify_arith_tactic.cpp
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@ -366,7 +366,7 @@ struct purify_arith_proc {
push_cnstr(EQ(x, u().mk_power(k, u().mk_numeral(n, false))));
push_cnstr_pr(result_pr);
}
else if (complete()) {
else {
SASSERT(n.is_even());
// (^ x (/ 1 n)) --> k | x >= 0 implies (x = k^n and k >= 0), x < 0 implies k = neg-root(x, n)
// when n is even
@ -379,9 +379,9 @@ struct purify_arith_proc {
EQ(k, u().mk_neg_root(x, u().mk_numeral(n, false)))));
push_cnstr_pr(result_pr);
}
else {
return BR_FAILED;
}
// else {
// return BR_FAILED;
// }
}
else {
// root not supported for integers.