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diff --git a/matita/matita/contribs/TPTP/HEQ/BOO012-3.ma b/matita/matita/contribs/TPTP/HEQ/BOO012-3.ma
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+++ b/matita/matita/contribs/TPTP/HEQ/BOO012-3.ma
@@ -0,0 +1,110 @@
+set "baseuri" "cic:/matita/TPTP/BOO012-3".
+include "logic/equality.ma".
+
+(* Inclusion of: BOO012-3.p *)
+
+(* -------------------------------------------------------------------------- *)
+
+(*  File     : BOO012-3 : TPTP v3.2.0. Bugfixed v1.2.1. *)
+
+(*  Domain   : Boolean Algebra *)
+
+(*  Problem  : Inverse is an involution *)
+
+(*  Version  : [MOW76] axioms : Augmented. *)
+
+(*  English  :  *)
+
+(*  Refs     : [Whi61] Whitesitt (1961), Boolean Algebra and Its Applications *)
+
+(*           : [MOW76] McCharen et al. (1976), Problems and Experiments for a *)
+
+(*  Source   : [MOW76] *)
+
+(*  Names    : B8 [MOW76] *)
+
+(*           : prob8.ver1 [ANL] *)
+
+(*  Status   : Unsatisfiable *)
+
+(*  Rating   : 0.00 v3.1.0, 0.22 v2.7.0, 0.00 v2.4.0, 0.17 v2.3.0, 0.33 v2.2.1, 0.62 v2.2.0, 0.50 v2.1.0, 0.33 v2.0.0 *)
+
+(*  Syntax   : Number of clauses     :   35 (   0 non-Horn;  17 unit;  19 RR) *)
+
+(*             Number of atoms       :   87 (   3 equality) *)
+
+(*             Maximal clause size   :    5 (   2 average) *)
+
+(*             Number of predicates  :    3 (   0 propositional; 2-3 arity) *)
+
+(*             Number of functors    :    6 (   3 constant; 0-2 arity) *)
+
+(*             Number of variables   :  120 (   6 singleton) *)
+
+(*             Maximal term depth    :    3 (   1 average) *)
+
+(*  Comments :  *)
+
+(*  Bugfixes : v1.2.1 - Clause x_plus_multiplicative_identity fixed. *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* ----Include boolean algebra axioms  *)
+
+(* Inclusion of: Axioms/BOO002-0.ax *)
+
+(* -------------------------------------------------------------------------- *)
+
+(*  File     : BOO002-0 : TPTP v3.2.0. Released v1.0.0. *)
+
+(*  Domain   : Boolean Algebra *)
+
+(*  Axioms   : Boolean algebra axioms *)
+
+(*  Version  : [MOW76] axioms. *)
+
+(*  English  :  *)
+
+(*  Refs     : [Whi61] Whitesitt (1961), Boolean Algebra and Its Applications *)
+
+(*           : [MOW76] McCharen et al. (1976), Problems and Experiments for a *)
+
+(*  Source   : [MOW76] *)
+
+(*  Names    :  *)
+
+(*  Status   :  *)
+
+(*  Syntax   : Number of clauses    :   22 (   0 non-Horn;  10 unit;  12 RR) *)
+
+(*             Number of literals   :   60 (   2 equality) *)
+
+(*             Maximal clause size  :    5 (   3 average) *)
+
+(*             Number of predicates :    3 (   0 propositional; 2-3 arity) *)
+
+(*             Number of functors   :    5 (   2 constant; 0-2 arity) *)
+
+(*             Number of variables  :   82 (   0 singleton) *)
+
+(*             Maximal term depth   :    2 (   1 average) *)
+
+(*  Comments :  *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* -----Well definedness of the operations  *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* -------------------------------------------------------------------------- *)
+theorem prove_inverse_is_an_involution:
+ ∀Univ:Set.∀U:Univ.∀V:Univ.∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀X_plus_Y:Univ.∀X_plus_Y_plus_Z:Univ.∀X_times_Y:Univ.∀X_times_Y_times_Z:Univ.∀Y:Univ.∀Y_plus_Z:Univ.∀Y_times_Z:Univ.∀Z:Univ.∀add:∀_:Univ.∀_:Univ.Univ.∀additive_identity:Univ.∀inverse:∀_:Univ.Univ.∀multiplicative_identity:Univ.∀multiply:∀_:Univ.∀_:Univ.Univ.∀product:∀_:Univ.∀_:Univ.∀_:Univ.Prop.∀sum:∀_:Univ.∀_:Univ.∀_:Univ.Prop.∀x:Univ.∀H0:∀X:Univ.∀X_times_Y:Univ.∀X_times_Y_times_Z:Univ.∀Y:Univ.∀Y_times_Z:Univ.∀Z:Univ.∀_:product X Y_times_Z X_times_Y_times_Z.∀_:product Y Z Y_times_Z.∀_:product X Y X_times_Y.product X_times_Y Z X_times_Y_times_Z.∀H1:∀X:Univ.∀X_times_Y:Univ.∀X_times_Y_times_Z:Univ.∀Y:Univ.∀Y_times_Z:Univ.∀Z:Univ.∀_:product X Y_times_Z X_times_Y_times_Z.∀_:product Y Z Y_times_Z.∀_:product X Y X_times_Y.product X_times_Y Z X_times_Y_times_Z.∀H2:∀X:Univ.∀X_plus_Y:Univ.∀X_plus_Y_plus_Z:Univ.∀Y:Univ.∀Y_plus_Z:Univ.∀Z:Univ.∀_:sum X Y_plus_Z X_plus_Y_plus_Z.∀_:sum Y Z Y_plus_Z.∀_:sum X Y X_plus_Y.sum X_plus_Y Z X_plus_Y_plus_Z.∀H3:∀X:Univ.∀X_plus_Y:Univ.∀X_plus_Y_plus_Z:Univ.∀Y:Univ.∀Y_plus_Z:Univ.∀Z:Univ.∀_:sum X Y_plus_Z X_plus_Y_plus_Z.∀_:sum Y Z Y_plus_Z.∀_:sum X Y X_plus_Y.sum X_plus_Y Z X_plus_Y_plus_Z.∀H4:∀X:Univ.∀Y:Univ.product X (add X Y) X.∀H5:∀X:Univ.∀Y:Univ.sum X (multiply X Y) X.∀H6:∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:sum X Y Z.product X Z X.∀H7:∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:product X Y Z.sum X Z X.∀H8:∀X:Univ.product X additive_identity additive_identity.∀H9:∀X:Univ.sum X multiplicative_identity multiplicative_identity.∀H10:∀X:Univ.product X X X.∀H11:∀X:Univ.sum X X X.∀H12:∀U:Univ.∀V:Univ.∀X:Univ.∀Y:Univ.∀_:product X Y V.∀_:product X Y U.eq Univ U V.∀H13:∀U:Univ.∀V:Univ.∀X:Univ.∀Y:Univ.∀_:sum X Y V.∀_:sum X Y U.eq Univ U V.∀H14:∀X:Univ.product X (inverse X) additive_identity.∀H15:∀X:Univ.product (inverse X) X additive_identity.∀H16:∀X:Univ.sum X (inverse X) multiplicative_identity.∀H17:∀X:Univ.sum (inverse X) X multiplicative_identity.∀H18:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:product V1 V2 V4.∀_:product Y Z V3.∀_:sum Z X V2.∀_:sum Y X V1.sum V3 X V4.∀H19:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:sum V3 X V4.∀_:product Y Z V3.∀_:sum Z X V2.∀_:sum Y X V1.product V1 V2 V4.∀H20:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:product V1 V2 V4.∀_:product Y Z V3.∀_:sum X Z V2.∀_:sum X Y V1.sum X V3 V4.∀H21:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:sum X V3 V4.∀_:product Y Z V3.∀_:sum X Z V2.∀_:sum X Y V1.product V1 V2 V4.∀H22:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:sum V1 V2 V4.∀_:sum Y Z V3.∀_:product Z X V2.∀_:product Y X V1.product V3 X V4.∀H23:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:product V3 X V4.∀_:sum Y Z V3.∀_:product Z X V2.∀_:product Y X V1.sum V1 V2 V4.∀H24:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:sum V1 V2 V4.∀_:sum Y Z V3.∀_:product X Z V2.∀_:product X Y V1.product X V3 V4.∀H25:∀V1:Univ.∀V2:Univ.∀V3:Univ.∀V4:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:product X V3 V4.∀_:sum Y Z V3.∀_:product X Z V2.∀_:product X Y V1.sum V1 V2 V4.∀H26:∀X:Univ.product X multiplicative_identity X.∀H27:∀X:Univ.product multiplicative_identity X X.∀H28:∀X:Univ.sum X additive_identity X.∀H29:∀X:Univ.sum additive_identity X X.∀H30:∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:product X Y Z.product Y X Z.∀H31:∀X:Univ.∀Y:Univ.∀Z:Univ.∀_:sum X Y Z.sum Y X Z.∀H32:∀X:Univ.∀Y:Univ.product X Y (multiply X Y).∀H33:∀X:Univ.∀Y:Univ.sum X Y (add X Y).eq Univ (inverse (inverse x)) x
+.
+intros.
+autobatch depth=5 width=5 size=20 timeout=10;
+try assumption.
+print proofterm.
+qed.
+
+(* -------------------------------------------------------------------------- *)