1 include "logic/equality.ma".
3 (* Inclusion of: LCL136-1.p *)
5 (* -------------------------------------------------------------------------- *)
7 (* File : LCL136-1 : TPTP v3.7.0. Released v1.0.0. *)
9 (* Domain : Logic Calculi (Wajsberg Algebra) *)
11 (* Problem : A lemma in Wajsberg algebras *)
13 (* Version : [Bon91] (equality) axioms. *)
15 (* English : An axiomatisation of the many valued sentential calculus *)
17 (* is {MV-1,MV-2,MV-3,MV-5} by Meredith. Wajsberg provided *)
19 (* a different axiomatisation. Show that a version of MV-2 *)
21 (* depends on the Wajsberg system. *)
23 (* Refs : [FRT84] Font et al. (1984), Wajsberg Algebras *)
25 (* : [Bon91] Bonacina (1991), Problems in Lukasiewicz Logic *)
27 (* : [MW92] McCune & Wos (1992), Experiments in Automated Deductio *)
29 (* Source : [Bon91] *)
31 (* Names : Lemma 5 [Bon91] *)
33 (* Status : Satisfiable *)
35 (* Rating : 0.33 v3.2.0, 0.67 v3.1.0, 0.33 v2.4.0, 0.67 v2.2.1, 0.75 v2.2.0, 0.67 v2.1.0, 1.00 v2.0.0 *)
37 (* Syntax : Number of clauses : 6 ( 0 non-Horn; 6 unit; 2 RR) *)
39 (* Number of atoms : 6 ( 6 equality) *)
41 (* Maximal clause size : 1 ( 1 average) *)
43 (* Number of predicates : 1 ( 0 propositional; 2-2 arity) *)
45 (* Number of functors : 6 ( 4 constant; 0-2 arity) *)
47 (* Number of variables : 8 ( 0 singleton) *)
49 (* Maximal term depth : 4 ( 2 average) *)
53 (* -------------------------------------------------------------------------- *)
55 (* ----Include Wajsberg algebra axioms *)
57 (* Inclusion of: Axioms/LCL001-0.ax *)
59 (* -------------------------------------------------------------------------- *)
61 (* File : LCL001-0 : TPTP v3.7.0. Released v1.0.0. *)
63 (* Domain : Logic Calculi (Wajsberg Algebras) *)
65 (* Axioms : Wajsberg algebra axioms *)
67 (* Version : [Bon91] (equality) axioms. *)
71 (* Refs : [FRT84] Font et al. (1984), Wajsberg Algebras *)
73 (* : [Bon91] Bonacina (1991), Problems in Lukasiewicz Logic *)
75 (* : [MW92] McCune & Wos (1992), Experiments in Automated Deductio *)
79 (* Names : MV Sentential Calculus [MW92] *)
83 (* Syntax : Number of clauses : 4 ( 0 non-Horn; 4 unit; 0 RR) *)
85 (* Number of atoms : 4 ( 4 equality) *)
87 (* Maximal clause size : 1 ( 1 average) *)
89 (* Number of predicates : 1 ( 0 propositional; 2-2 arity) *)
91 (* Number of functors : 3 ( 1 constant; 0-2 arity) *)
93 (* Number of variables : 8 ( 0 singleton) *)
95 (* Maximal term depth : 4 ( 2 average) *)
99 (* -------------------------------------------------------------------------- *)
101 (* -------------------------------------------------------------------------- *)
103 (* -------------------------------------------------------------------------- *)
104 ntheorem prove_wajsberg_lemma:
105 (∀Univ:Type.∀X:Univ.∀Y:Univ.∀Z:Univ.
106 ∀implies:∀_:Univ.∀_:Univ.Univ.
112 ∀H0:eq Univ (implies x y) (implies y z).
113 ∀H1:∀X:Univ.∀Y:Univ.eq Univ (implies (implies (not X) (not Y)) (implies Y X)) truth.
114 ∀H2:∀X:Univ.∀Y:Univ.eq Univ (implies (implies X Y) Y) (implies (implies Y X) X).
115 ∀H3:∀X:Univ.∀Y:Univ.∀Z:Univ.eq Univ (implies (implies X Y) (implies (implies Y Z) (implies X Z))) truth.
116 ∀H4:∀X:Univ.eq Univ (implies truth X) X.eq Univ (implies x z) truth)
133 nauto by H0,H1,H2,H3,H4 ##;
134 ntry (nassumption) ##;
137 (* -------------------------------------------------------------------------- *)