1 include "logic/equality.ma".
3 (* Inclusion of: BOO086-1.p *)
5 (* -------------------------------------------------------------------------- *)
7 (* File : BOO086-1 : TPTP v3.2.0. Released v2.6.0. *)
9 (* Domain : Boolean Algebra *)
11 (* Problem : Axiom C5 for Boolean algebra in the Sheffer stroke, 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 : Unknown *)
27 (* Rating : 1.00 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 : 4 ( 3 constant; 0-2 arity) *)
39 (* Number of variables : 3 ( 0 singleton) *)
41 (* Maximal term depth : 5 ( 4 average) *)
43 (* Comments : A UEQ part of BOO044-1 *)
45 (* -------------------------------------------------------------------------- *)
46 ntheorem prove_meredith_2_basis_2:
47 ∀Univ:Type.∀A:Univ.∀B:Univ.∀C:Univ.
51 ∀nand:∀_:Univ.∀_:Univ.Univ.
52 ∀H0:∀A:Univ.∀B:Univ.∀C:Univ.eq Univ (nand (nand A (nand A (nand B C))) (nand B (nand C A))) B.eq Univ (nand a (nand b (nand a c))) (nand (nand (nand c b) b) a)
66 (* -------------------------------------------------------------------------- *)