%------------------------------------------------------------------------------
% File : Prover9---2026-6A
% Problem : SET201+3 : TPTP v9.3.1. Released v2.2.0.
% Transfm : none
% Format : tptp:raw
% Command : prover9 -casc 300 -f /export/starexec/sandbox2/benchmark/theBenchmark.p
% Computer : n018.cluster.edu
% Model : x86_64 x86_64
% CPU : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory : 8046.5625MB
% OS : Linux 6.8.0-71-generic
% CPULimit : 300s
% WCLimit : 300s
% DateTime : Sun Sep 27 08:36:02 AM UTC 2026
% Result : Theorem 0.17s 0.54s
% Output : CNFRefutation 0.81s
% Verified :
% SZS Type : Refutation
% Derivation depth : 9
% Number of leaves : 3
% Syntax : Number of formulae : 29 ( 11 unt; 0 def)
% Number of atoms : 68 ( 0 equ)
% Maximal formula atoms : 7 ( 2 avg)
% Number of connectives : 65 ( 26 ~; 21 |; 13 &)
% ( 2 <=>; 3 =>; 0 <=; 0 <~>)
% Maximal formula depth : 8 ( 4 avg)
% Maximal term depth : 3 ( 1 avg)
% Number of predicates : 3 ( 2 usr; 1 prp; 0-2 aty)
% Number of functors : 6 ( 6 usr; 4 con; 0-2 aty)
% Number of variables : 50 ( 2 sgn 27 !; 5 ?)
% Comments :
%------------------------------------------------------------------------------
fof(intersection_defn,axiom,
! [B,C,D] :
( member(D,intersection(B,C))
<=> ( member(D,C)
& member(D,B) ) ),
file('theBenchmark.p',intersection_defn) ).
fof(subset_defn,axiom,
! [B,C] :
( subset(B,C)
<=> ! [D] :
( member(D,B)
=> member(D,C) ) ),
file('theBenchmark.p',subset_defn) ).
fof(prove_th41,conjecture,
! [B,C,D,E] :
( ( subset(D,E)
& subset(B,C) )
=> subset(intersection(B,D),intersection(C,E)) ),
file('theBenchmark.p',prove_th41) ).
fof(prove_th41_neg,negated_conjecture,
~ ! [B,C,D,E] :
( ( subset(D,E)
& subset(B,C) )
=> subset(intersection(B,D),intersection(C,E)) ),
inference(assume_negation,[status(cth)],[prove_th41]) ).
cnf(c_7,plain,
( member(A,B)
| ~ member(A,intersection(B,C)) ),
inference(clausify,[status(thm)],[intersection_defn]) ).
cnf(c_8,plain,
( member(A,C)
| ~ member(A,intersection(B,C)) ),
inference(clausify,[status(thm)],[intersection_defn]) ).
cnf(c_9,plain,
( ~ member(A,C)
| ~ member(A,B)
| member(A,intersection(B,C)) ),
inference(clausify,[status(thm)],[intersection_defn]) ).
fof(nnf_2,plain,
! [B,C] :
( ( ? [D] :
( ~ member(D,C)
& member(D,B) )
| subset(B,C) )
& ( ! [X0] :
( member(X0,C)
| ~ member(X0,B) )
| ~ subset(B,C) ) ),
inference(fof_nnf,[status(thm)],[subset_defn]) ).
fof(sk_subset_defn_sk,plain,
! [B,C] :
( ( ( ~ member(sK0(B,C),C)
& member(sK0(B,C),B) )
| subset(B,C) )
& ( ! [X0] :
( member(X0,C)
| ~ member(X0,B) )
| ~ subset(B,C) ) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK0]),skolemize(D,sK0(B,C))],[nnf_2]) ).
fof(sk_subset_defn,plain,
( ! [VAR_0,VAR_1] :
( ~ member(sK0(VAR_0,VAR_1),VAR_1)
| subset(VAR_0,VAR_1) )
& ! [VAR_0,VAR_1] :
( member(sK0(VAR_0,VAR_1),VAR_0)
| subset(VAR_0,VAR_1) )
& ! [VAR_0,VAR_1,VAR_2] :
( member(VAR_2,VAR_1)
| ~ member(VAR_2,VAR_0)
| ~ subset(VAR_0,VAR_1) ) ),
inference(cnf_transformation,[status(thm)],[sk_subset_defn_sk]) ).
cnf(c_10,plain,
( member(C,B)
| ~ member(C,A)
| ~ subset(A,B) ),
inference(split_conjunct,[status(thm)],[sk_subset_defn]) ).
cnf(c_11,plain,
( member(sK0(A,B),A)
| subset(A,B) ),
inference(split_conjunct,[status(thm)],[sk_subset_defn]) ).
cnf(c_12,plain,
( ~ member(sK0(A,B),B)
| subset(A,B) ),
inference(split_conjunct,[status(thm)],[sk_subset_defn]) ).
fof(nnf_6,plain,
? [B,C,D,E] :
( ~ subset(intersection(B,D),intersection(C,E))
& subset(D,E)
& subset(B,C) ),
inference(fof_nnf,[status(thm)],[prove_th41_neg]) ).
fof(sk_prove_th41_neg,plain,
( ~ subset(intersection(sK1,sK3),intersection(sK2,sK4))
& subset(sK3,sK4)
& subset(sK1,sK2) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK1,sK2,sK3,sK4]),skolemize(B,sK1),skolemize(C,sK2),skolemize(D,sK3),skolemize(E,sK4)],[nnf_6]) ).
cnf(c_19,negated_conjecture,
subset(sK1,sK2),
inference(split_conjunct,[status(thm)],[sk_prove_th41_neg]) ).
cnf(c_20,negated_conjecture,
subset(sK3,sK4),
inference(split_conjunct,[status(thm)],[sk_prove_th41_neg]) ).
cnf(c_21,negated_conjecture,
~ subset(intersection(sK1,sK3),intersection(sK2,sK4)),
inference(split_conjunct,[status(thm)],[sk_prove_th41_neg]) ).
cnf(c_46,plain,
( member(A,sK2)
| ~ member(A,sK1) ),
inference(resolve,[status(thm)],[c_19,c_10]) ).
cnf(c_47,plain,
( member(A,sK4)
| ~ member(A,sK3) ),
inference(resolve,[status(thm)],[c_20,c_10]) ).
cnf(c_48,plain,
member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),intersection(sK1,sK3)),
inference(resolve,[status(thm)],[c_21,c_11]) ).
cnf(c_49,negated_conjecture,
~ member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),intersection(sK2,sK4)),
inference(resolve,[status(thm)],[c_12,c_21]) ).
cnf(c_158,plain,
member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK3),
inference(resolve,[status(thm)],[c_48,c_8]) ).
cnf(c_159,plain,
member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK1),
inference(resolve,[status(thm)],[c_48,c_7]) ).
cnf(c_199,plain,
member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK4),
inference(resolve,[status(thm)],[c_158,c_47]) ).
cnf(c_245,plain,
member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK2),
inference(resolve,[status(thm)],[c_159,c_46]) ).
cnf(c_337,plain,
( ~ member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK4)
| ~ member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK2) ),
inference(resolve,[status(thm)],[c_9,c_49]) ).
cnf(c_338,plain,
~ member(sK0(intersection(sK1,sK3),intersection(sK2,sK4)),sK2),
inference(resolve,[status(thm)],[c_337,c_199]) ).
cnf(c_336,plain,
$false,
inference(resolve,[status(thm)],[c_245,c_338]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.05 % Problem : SET201+3 : TPTP v9.3.1. Released v2.2.0.
% 0.00/0.06 % Command : prover9 -casc 300 -f /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.17/0.44 % Computer : n018.cluster.edu
% 0.17/0.44 % Model : x86_64 x86_64
% 0.17/0.44 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.17/0.44 % Memory : 8046.5625MB
% 0.17/0.44 % OS : Linux 6.8.0-71-generic
% 0.17/0.44 % CPULimit : 300
% 0.17/0.44 % WCLimit : 300
% 0.17/0.44 % DateTime : Sat Sep 26 07:21:21 UTC 2026
% 0.17/0.44 % CPUTime :
% 0.17/0.44 % Prover9 (64) version 2026-6A, July 2026, CASC-J13.
% 0.17/0.44 % Process 4037907 was started by sandbox2 on n018,
% 0.17/0.44 % Sat Sep 26 07:21:21 2026
% 0.17/0.44 % The command was "/export/starexec/sandbox2/solver/bin/prover9 -casc 300 -f /export/starexec/sandbox2/benchmark/theBenchmark.p".
% 0.17/0.45
% 0.17/0.45 % From the command line: assign(max_seconds, 300).
% 0.17/0.54
% 0.17/0.54 % SZS status Theorem for theBenchmark
% 0.17/0.54
% 0.17/0.54 % Proof 1 at 0.05 (+ 0.02) seconds.
% 0.17/0.54 % Length of proof is 21.
% 0.17/0.54 % Level of proof is 5.
% 0.17/0.54 % Maximum clause weight is 11.000.
% 0.17/0.54 % Given clauses 61.
% 0.17/0.54
% 0.17/0.54 % SZS output start CNFRefutation for theBenchmark
% See solution above
%------------------------------------------------------------------------------