1 include "logic/equality.ma".
3 (* Inclusion of: BOO073-1.p *)
5 (* -------------------------------------------------------------------------- *)
7 (* File : BOO073-1 : TPTP v3.7.0. Released v2.6.0. *)
9 (* Domain : Boolean Algebra *)
11 (* Problem : DN-1 is a single axiom for Boolean algebra, part 2 *)
13 (* Version : [EF+02] axioms. *)
17 (* Refs : [EF+02] Ernst et al. (2002), More First-order Test Problems in *)
19 (* : [MV+02] McCune et al. (2002), Short Single Axioms for Boolean *)
25 (* Status : Unsatisfiable *)
27 (* Rating : 0.22 v3.4.0, 0.25 v3.3.0, 0.36 v3.1.0, 0.33 v2.7.0, 0.36 v2.6.0 *)
29 (* Syntax : Number of clauses : 2 ( 0 non-Horn; 2 unit; 1 RR) *)
31 (* Number of atoms : 2 ( 2 equality) *)
33 (* Maximal clause size : 1 ( 1 average) *)
35 (* Number of predicates : 1 ( 0 propositional; 2-2 arity) *)
37 (* Number of functors : 5 ( 3 constant; 0-2 arity) *)
39 (* Number of variables : 4 ( 2 singleton) *)
41 (* Maximal term depth : 9 ( 4 average) *)
43 (* Comments : A UEQ part of BOO038-1 *)
45 (* -------------------------------------------------------------------------- *)
47 (∀Univ:Type.∀A:Univ.∀B:Univ.∀C:Univ.∀D:Univ.
49 ∀add:∀_:Univ.∀_:Univ.Univ.
52 ∀inverse:∀_:Univ.Univ.
53 ∀H0:∀A:Univ.∀B:Univ.∀C:Univ.∀D:Univ.eq Univ (inverse (add (inverse (add (inverse (add A B)) C)) (inverse (add A (inverse (add (inverse C) (inverse (add C D)))))))) C.eq Univ (add (add a b) c) (add a (add b c)))
67 ntry (nassumption) ##;
70 (* -------------------------------------------------------------------------- *)