/*
* The method Skolemize performs best-effort skolemization of the input expression expr.
* If polarity == Polarity.Negative, a quantifier F embedded in expr is skolemized
* provided it can be proved that F is a forall quantifier in the NNF version of expr.
* If polarity == Polarity.Positive, a quantifier F embedded in expr is skolemized
* provided it can be proved that F is an exists quantifier in the NNF version of expr.
*
* Factorization is performed on the resulting expression.
*/
public static VCExpr Skolemize(QuantifierInstantiationEngine qiEngine, Polarity polarity, VCExpr vcExpr)
{
var skolemizer = new Skolemizer(qiEngine, polarity, vcExpr);
var skolemizedExpr = skolemizer.Mutate(vcExpr, true);
return(Factorizer.Factorize(qiEngine, QuantifierCollector.Flip(polarity), skolemizedExpr));
}
public static VCExpr Factorize(QuantifierInstantiationEngine qiEngine, Polarity polarity, VCExpr vcExpr)
{
var factorizer = new Factorizer(qiEngine, polarity, vcExpr);
return(factorizer.Mutate(vcExpr, true));
}