def _check(expression):
"""method performing check"""
if background_knowledge:
e = AndExpression(expression.fol(), background_knowledge)
if verbose:
print "performing check on: %s" % e
t = Theorem(NegatedExpression(e), e)
else:
if verbose:
print "performing check on: %s" % expression.fol()
t = Theorem(NegatedExpression(expression), expression)
result, output = t.check()
if verbose:
if output:
print "\nMace4 returns:\n%s\n" % output
else:
print "\nProver9 returns: %s\n" % (not result)
return result
def fol(self):
e = AndExpression(self.first.fol(), self.second.fol())
if self.consequent:
e = ImpExpression(e, self.consequent.fol())
return e