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diff --git a/matita/matita/contribs/ng_TPTP/BOO091-1.ma b/matita/matita/contribs/ng_TPTP/BOO091-1.ma
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+include "logic/equality.ma".
+
+(* Inclusion of: BOO091-1.p *)
+
+(* -------------------------------------------------------------------------- *)
+
+(*  File     : BOO091-1 : TPTP v3.7.0. Released v2.6.0. *)
+
+(*  Domain   : Boolean Algebra *)
+
+(*  Problem  : Axiom C8 for Boolean algebra in the Sheffer stroke, part 1 *)
+
+(*  Version  : [EF+02] axioms. *)
+
+(*  English  :  *)
+
+(*  Refs     : [EF+02] Ernst et al. (2002), More First-order Test Problems in *)
+
+(*           : [MV+02] McCune et al. (2002), Short Single Axioms for Boolean *)
+
+(*  Source   : [TPTP] *)
+
+(*  Names    :  *)
+
+(*  Status   : Unknown *)
+
+(*  Rating   : 1.00 v2.6.0 *)
+
+(*  Syntax   : Number of clauses     :    2 (   0 non-Horn;   2 unit;   1 RR) *)
+
+(*             Number of atoms       :    2 (   2 equality) *)
+
+(*             Maximal clause size   :    1 (   1 average) *)
+
+(*             Number of predicates  :    1 (   0 propositional; 2-2 arity) *)
+
+(*             Number of functors    :    3 (   2 constant; 0-2 arity) *)
+
+(*             Number of variables   :    3 (   1 singleton) *)
+
+(*             Maximal term depth    :    5 (   2 average) *)
+
+(*  Comments : A UEQ part of BOO047-1 *)
+
+(* -------------------------------------------------------------------------- *)
+ntheorem prove_meredith_2_basis_1:
+ (∀Univ:Type.∀A:Univ.∀B:Univ.∀C:Univ.
+∀a:Univ.
+∀b:Univ.
+∀nand:∀_:Univ.∀_:Univ.Univ.
+∀H0:∀A:Univ.∀B:Univ.∀C:Univ.eq Univ (nand (nand (nand A (nand A B)) A) (nand B (nand C A))) B.eq Univ (nand (nand a a) (nand b a)) a)
+.
+#Univ ##.
+#A ##.
+#B ##.
+#C ##.
+#a ##.
+#b ##.
+#nand ##.
+#H0 ##.
+nauto by H0 ##;
+ntry (nassumption) ##;
+nqed.
+
+(* -------------------------------------------------------------------------- *)