/// <summary> /// Using resolution rule: A V B, C V !B |- A V C. /// </summary> /// <param name="z"></param> private static void Modificator(ITypizedDecorArray <MultipleOr, SkolemPredicateNode, MultipleOr, SkolemPredicateNode> z) { var rules = UnificationService.GetUnificationRules(z.B.Node, z.D.Node); UnificationService.Unificate(z.A.Node, rules); UnificationService.Unificate(z.C.Node, rules); var aChildren = z.A.Node.Children.ToList(); var cChildren = z.C.Node.Children.ToList(); aChildren.Remove(z.B.Node); cChildren.Remove(z.D.Node); z.A.Replace(new MultipleOr(aChildren.ToArray())); z.C.Replace(new MultipleOr(cChildren.ToArray())); }
public void HardUnificationTest() { // P(a,x,f(g(y)) Expression <Del2> A = (x, y) => P(a, x, f(g(y))); // P(z,f(z),f(u)) Expression <Del2> B = (z, u) => P(z, f(z), f(u)); var node1 = (SkolemPredicateNode)Expressions2LogicTree.Parse(A).Children[0]; var node2 = (SkolemPredicateNode)Expressions2LogicTree.Parse(B).Children[0]; Assert.AreEqual(true, UnificationService.CanUnificate(node1, node2)); var rules = UnificationService.GetUnificationRules(node1, node2); Assert.AreEqual(3, rules.Count); UnificationService.Unificate(node1, node2); Assert.AreEqual(node1.ToString(), node2.ToString()); }
public void UnificationTest() { // P(f(x), z) var A = new SkolemPredicateNode("P", false, new FunctionNode("f", VariableNode.Make <bool>(0, "x")), VariableNode.Make <bool>(2, "z")); // P(y,a) var B = new SkolemPredicateNode("P", false, VariableNode.Make <bool>(1, "y"), new FunctionNode("a")); Assert.AreEqual(true, UnificationService.CanUnificate(A, B)); var rules = UnificationService.GetUnificationRules(A, B); Assert.AreEqual(2, rules.Count); UnificationService.Unificate(A, rules); UnificationService.Unificate(B, rules); Assert.AreEqual("P(f(x),a)", A.ToString()); Assert.AreEqual(A.ToString(), B.ToString()); }
public void ComplexUnificationTest() { // !P(x,b,z,s) V ANS(f(g(z,b,h(x,z,s)))) var A = new MultipleOr( new SkolemPredicateNode("P", true, VariableNode.Make <bool>(0, "x"), new FunctionNode("b"), VariableNode.Make <bool>(2, "z"), VariableNode.Make <bool>(3, "s")), new SkolemPredicateNode("ANS", false, new FunctionNode("f", new FunctionNode("g", VariableNode.Make <bool>(2, "z"), new FunctionNode("b"), new FunctionNode("h", VariableNode.Make <bool>(0, "x"), VariableNode.Make <bool>(2, "z"), VariableNode.Make <bool>(3, "s")))))); // P(a,b,c,s0) var B = new SkolemPredicateNode("P", false, new FunctionNode("a"), new FunctionNode("b"), new FunctionNode("c"), new FunctionNode("s0")); Assert.AreEqual(true, UnificationService.CanUnificate((SkolemPredicateNode)A.Children[0], B)); var rules = UnificationService.GetUnificationRules((SkolemPredicateNode)A.Children[0], B); Assert.AreEqual(3, rules.Count); UnificationService.Unificate(A, rules); Assert.AreEqual("!P(a,b,c,s0) ∨ ANS(f(g(c,b,h(a,c,s0))))", A.ToString()); }