public override String getJustification()
{
int lowStep = parent1.getProofStep().getStepNumber();
int highStep = parent2.getProofStep().getStepNumber();
if (lowStep > highStep)
{
lowStep = highStep;
highStep = parent1.getProofStep().getStepNumber();
}
return "Resolution: " + lowStep + "," + highStep + " " + subst + ", "
+ renameSubst;
}
// END-ProofStep