public void testContrapositives()
{
List<Chain> conts;
Literal p = new Literal(new Predicate("P", new List<Term>()));
Literal notq = new Literal(new Predicate("Q", new List<Term>()),
true);
Literal notr = new Literal(new Predicate("R", new List<Term>()),
true);
Chain c = new Chain();
conts = c.getContrapositives();
Assert.AreEqual(0, conts.Count);
c.addLiteral(p);
conts = c.getContrapositives();
Assert.AreEqual(0, conts.Count);
c.addLiteral(notq);
conts = c.getContrapositives();
Assert.AreEqual(1, conts.Count);
Assert.AreEqual("<~Q(),P()>", conts[0].ToString());
c.addLiteral(notr);
conts = c.getContrapositives();
Assert.AreEqual(2, conts.Count);
Assert.AreEqual("<~Q(),P(),~R()>", conts[0].ToString());
Assert.AreEqual("<~R(),P(),~Q()>", conts[1].ToString());
}
// END-InferenceProcedure
//
//
// PRIVATE METHODS
//
public List<Chain> createChainsFromClauses(List<Clause> clauses)
{
List<Chain> chains = new List<Chain>();
foreach (Clause c in clauses)
{
Chain chn = new Chain(c.getLiterals());
chn.setProofStep(new ProofStepChainFromClause(chn, c));
chains.Add(chn);
chains.AddRange(chn.getContrapositives());
}
return chains;
}
