@Override
public ESat isEntailed() {
boolean possibleTrue =
PropUtil.isKerSubsetEnv(result, consequent) && PropUtil.isKerSubsetEnv(consequent, result);
boolean possibleFalse =
PropUtil.isKerSubsetEnv(result, alternative)
&& PropUtil.isKerSubsetEnv(alternative, result);
if (!possibleTrue && !possibleFalse) {
return ESat.FALSE;
}
if (antecedent.isInstantiated()) {
if (antecedent.getValue() == 1) {
if (!possibleTrue) {
return ESat.FALSE;
}
return result.isInstantiated() && consequent.isInstantiated() ? ESat.TRUE : ESat.UNDEFINED;
} else {
if (!possibleFalse) {
return ESat.FALSE;
}
return result.isInstantiated() && alternative.isInstantiated() ? ESat.TRUE : ESat.UNDEFINED;
}
}
if (possibleTrue
&& possibleFalse
&& result.isInstantiated()
&& consequent.isInstantiated()
&& alternative.isInstantiated()) {
return ESat.TRUE;
}
return ESat.UNDEFINED;
}
@Override
public ESat isEntailed() {
if (!PropUtil.isKerSubsetEnv(s1, s2) || !PropUtil.isKerSubsetEnv(s2, s1)) {
return ESat.FALSE;
}
if (s1.isInstantiated() && s2.isInstantiated()) {
return ESat.TRUE;
}
int setIntersection = 0;
ISetIterator iter = s1.getUB().iterator();
while (iter.hasNext()) {
int i = iter.nextInt();
if (s2.getUB().contains(i)) {
setIntersection++;
}
}
if (setIntersection < s1.getCard().getLB() || setIntersection < s2.getCard().getLB()) {
return ESat.FALSE;
}
return ESat.UNDEFINED;
}