public void ErrorUnificationTest() { // Q(f(a),g(x)) Expression <Del1> A = (x) => Q(f(a), g(x)); // Q(y,y) Expression <Del1> B = (y) => Q(y, y); var node1 = (SkolemPredicateNode)Expressions2LogicTree.Parse(A).Children[0]; var node2 = (SkolemPredicateNode)Expressions2LogicTree.Parse(B).Children[0]; Assert.AreEqual(false, UnificationService.CanUnificate(node1, node2)); }
/// <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 static IEnumerable <IRule> Get() { yield return(Rule .New("&&0", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(AnyA[ChildB, ChildC]) .Where <And, Constant <bool>, INode>(z => !z.B.Value) .Mod(z => z.A.Replace(z.B.Node))); yield return(Rule .New("||1", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(AnyA[ChildB, ChildC]) .Where <Or, Constant <bool>, INode>(z => z.B.Value) .Mod(z => z.A.Replace(z.B.Node))); yield return(Rule .New("&&1", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(AnyA[ChildB, ChildC]) .Where <And, Constant <bool>, INode>(z => z.B.Value) .Mod(z => z.A.Replace(z.C.Node))); yield return(Rule .New("||0", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(AnyA[ChildB, ChildC]) .Where <Or, Constant <bool>, INode>(z => !z.B.Value) .Mod(z => z.A.Replace(z.C.Node))); yield return(Rule .New("!!", StdTags.Deductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(AnyA[B[C]]) .Where <Not, Not, INode>() .Mod(z => z.A.Replace(z.C.Node))); yield return(Rule .New("x V x", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(A[ChildB, ChildC]) .Where <Or, INode, INode>(z => UnificationService.IsSame(z.B, z.C, true)) .Mod(z => z.A.Replace(z.B.Node))); yield return(Rule .New("!x V x", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection, StdTags.Simplification) .Select(A[ChildB[ChildC], ChildD]) .Where <Or, Not, INode, INode>(z => UnificationService.IsSame(z.C, z.D, true)) .Mod(z => z.A.Replace(new Constant <bool>(true)))); }
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()); }
public static IRule Get() { return(Rule .New("Resolve", StdTags.Inductive, StdTags.Logic, StdTags.SafeResection) .Select(A[ChildB], C[ChildD]) .Where <MultipleOr, SkolemPredicateNode, MultipleOr, SkolemPredicateNode>(z => UnificationService.CanUnificate(z.B, z.D) && (z.B.IsNegate || z.D.IsNegate)) .Mod(Modificator)); }