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diff --git a/helm/software/matita/contribs/TPTP/HEQ/ROB006-3.ma b/helm/software/matita/contribs/TPTP/HEQ/ROB006-3.ma
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+++ b/helm/software/matita/contribs/TPTP/HEQ/ROB006-3.ma
@@ -0,0 +1,164 @@
+set "baseuri" "cic:/matita/TPTP/ROB006-3".
+include "logic/equality.ma".
+
+(* Inclusion of: ROB006-3.p *)
+
+(* -------------------------------------------------------------------------- *)
+
+(*  File     : ROB006-3 : TPTP v3.2.0. Released v1.0.0. *)
+
+(*  Domain   : Robbins Algebra *)
+
+(*  Problem  : c + d=d => Boolean *)
+
+(*  Version  : [Win90] (equality) axioms : Augmented. *)
+
+(*             Theorem formulation : Denies Huntington's axiom. *)
+
+(*  English  : If there are elements c and d such that c+d=d, then the  *)
+
+(*             algebra is Boolean. *)
+
+(*  Refs     : [HMT71] Henkin et al. (1971), Cylindrical Algebras *)
+
+(*           : [Win90] Winker (1990), Robbins Algebra: Conditions that make a *)
+
+(*           : [Wos92] Wos (1992), An Opportunity to Test Your Skills, and th *)
+
+(*  Source   : [Wos92] *)
+
+(*  Names    : Theorem 1.1 [Win90] *)
+
+(*  Status   : Unsatisfiable *)
+
+(*  Rating   : 0.86 v3.1.0, 1.00 v2.0.0 *)
+
+(*  Syntax   : Number of clauses     :   13 (   0 non-Horn;   8 unit;   8 RR) *)
+
+(*             Number of atoms       :   19 (  14 equality) *)
+
+(*             Maximal clause size   :    3 (   1 average) *)
+
+(*             Number of predicates  :    2 (   0 propositional; 1-2 arity) *)
+
+(*             Number of functors    :    9 (   5 constant; 0-2 arity) *)
+
+(*             Number of variables   :   19 (   0 singleton) *)
+
+(*             Maximal term depth    :    8 (   3 average) *)
+
+(*  Comments : Commutativity, associativity, and Huntington's axiom  *)
+
+(*             axiomatize Boolean algebra. *)
+
+(*           : The extra lemmas are suggested by Winker (1990). *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* ----Include axioms for Robbins algebra  *)
+
+(* Inclusion of: Axioms/ROB001-0.ax *)
+
+(* -------------------------------------------------------------------------- *)
+
+(*  File     : ROB001-0 : TPTP v3.2.0. Released v1.0.0. *)
+
+(*  Domain   : Robbins algebra *)
+
+(*  Axioms   : Robbins algebra axioms *)
+
+(*  Version  : [Win90] (equality) axioms. *)
+
+(*  English  :  *)
+
+(*  Refs     : [HMT71] Henkin et al. (1971), Cylindrical Algebras *)
+
+(*           : [Win90] Winker (1990), Robbins Algebra: Conditions that make a *)
+
+(*  Source   : [OTTER] *)
+
+(*  Names    : Lemma 2.2 [Win90] *)
+
+(*  Status   :  *)
+
+(*  Syntax   : Number of clauses    :    3 (   0 non-Horn;   3 unit;   0 RR) *)
+
+(*             Number of literals   :    3 (   3 equality) *)
+
+(*             Maximal clause size  :    1 (   1 average) *)
+
+(*             Number of predicates :    1 (   0 propositional; 2-2 arity) *)
+
+(*             Number of functors   :    2 (   0 constant; 1-2 arity) *)
+
+(*             Number of variables  :    7 (   0 singleton) *)
+
+(*             Maximal term depth   :    6 (   3 average) *)
+
+(*  Comments :  *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* ----Include axioms for Robbins algebra numbers  *)
+
+(* Inclusion of: Axioms/ROB001-1.ax *)
+
+(* -------------------------------------------------------------------------- *)
+
+(*  File     : ROB001-1 : TPTP v3.2.0. Released v1.0.0. *)
+
+(*  Domain   : Robbins Algebra *)
+
+(*  Axioms   : Robbins algebra numbers axioms *)
+
+(*  Version  : [Win90] (equality) axioms. *)
+
+(*  English  :  *)
+
+(*  Refs     : [HMT71] Henkin et al. (1971), Cylindrical Algebras *)
+
+(*           : [Win90] Winker (1990), Robbins Algebra: Conditions that make a *)
+
+(*  Source   : [Win90] *)
+
+(*  Names    :  *)
+
+(*  Status   :  *)
+
+(*  Syntax   : Number of clauses    :    4 (   0 non-Horn;   2 unit;   2 RR) *)
+
+(*             Number of literals   :    6 (   2 equality) *)
+
+(*             Maximal clause size  :    2 (   2 average) *)
+
+(*             Number of predicates :    2 (   0 propositional; 1-2 arity) *)
+
+(*             Number of functors   :    4 (   1 constant; 0-2 arity) *)
+
+(*             Number of variables  :    4 (   0 singleton) *)
+
+(*             Maximal term depth   :    3 (   2 average) *)
+
+(*  Comments : Requires ROB001-0.ax *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* -------------------------------------------------------------------------- *)
+
+(* ----The following are extra lemmas  *)
+
+(* ----Hypothesis of the theorem  *)
+theorem prove_huntingtons_axiom:
+ ∀Univ:Set.∀V:Univ.∀V2:Univ.∀X:Univ.∀Y:Univ.∀Z:Univ.∀a:Univ.∀add:∀_:Univ.∀_:Univ.Univ.∀b:Univ.∀c:Univ.∀d:Univ.∀multiply:∀_:Univ.∀_:Univ.Univ.∀negate:∀_:Univ.Univ.∀one:Univ.∀positive_integer:∀_:Univ.Prop.∀successor:∀_:Univ.Univ.∀H0:eq Univ (add c d) d.∀H1:∀X:Univ.∀Y:Univ.∀_:eq Univ (negate (add (negate Y) (negate (add X (negate Y))))) X.eq Univ (add Y (multiply (successor (successor one)) (add X (negate (add X (negate Y)))))) (add Y (multiply (successor one) (add X (negate (add X (negate Y)))))).∀H2:∀X:Univ.∀Y:Univ.∀_:eq Univ (negate (add X (negate Y))) (negate Y).eq Univ (add Y (multiply (successor (successor one)) (add X (negate (add X (negate Y)))))) (add Y (multiply (successor one) (add X (negate (add X (negate Y)))))).∀H3:∀V2:Univ.∀X:Univ.∀Y:Univ.∀_:eq Univ (negate (add X Y)) (negate Y).∀_:positive_integer V2.eq Univ (negate (add Y (multiply V2 (add X (negate (add X (negate Y))))))) (negate Y).∀H4:∀X:Univ.eq Univ (add X X) X.∀H5:∀X:Univ.∀_:positive_integer X.positive_integer (successor X).∀H6:positive_integer one.∀H7:∀V:Univ.∀X:Univ.∀_:positive_integer X.eq Univ (multiply (successor V) X) (add X (multiply V X)).∀H8:∀X:Univ.eq Univ (multiply one X) X.∀H9:∀X:Univ.∀Y:Univ.eq Univ (negate (add (negate (add X Y)) (negate (add X (negate Y))))) X.∀H10:∀X:Univ.∀Y:Univ.∀Z:Univ.eq Univ (add (add X Y) Z) (add X (add Y Z)).∀H11:∀X:Univ.∀Y:Univ.eq Univ (add X Y) (add Y X).eq Univ (add (negate (add a (negate b))) (negate (add (negate a) (negate b)))) b
+.
+intros.
+autobatch paramodulation timeout=600;
+try assumption.
+print proofterm.
+qed.
+
+(* -------------------------------------------------------------------------- *)