%------------------------------------------------------------------------------
% File : Prover9---2026-6A
% Problem : SYN950+1 : TPTP v9.3.1. Released v3.1.0.
% Transfm : none
% Format : tptp:raw
% Command : prover9 -casc 300 -f /export/starexec/sandbox/benchmark/theBenchmark.p
% Computer : n016.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 09:43:26 AM UTC 2026
% Result : Theorem 0.08s 15.42s
% Output : CNFRefutation 0.08s
% Verified :
% SZS Type : Refutation
% Derivation depth : 9
% Number of leaves : 1
% Syntax : Number of formulae : 12 ( 3 unt; 0 def)
% Number of atoms : 45 ( 0 equ)
% Maximal formula atoms : 10 ( 3 avg)
% Number of connectives : 49 ( 16 ~; 13 |; 12 &)
% ( 0 <=>; 8 =>; 0 <=; 0 <~>)
% Maximal formula depth : 8 ( 4 avg)
% Maximal term depth : 1 ( 1 avg)
% Number of predicates : 3 ( 2 usr; 1 prp; 0-1 aty)
% Number of functors : 2 ( 2 usr; 2 con; 0-0 aty)
% Number of variables : 22 ( 1 sgn 14 !; 4 ?)
% Comments :
%------------------------------------------------------------------------------
fof(prove_this,conjecture,
! [A,B] :
( ! [Y] :
( q(Y)
=> p(Y) )
=> ? [X] :
( ( q(X)
=> p(B) )
& ( p(X)
=> p(A) ) ) ),
file('theBenchmark.p',prove_this) ).
fof(prove_this_neg,negated_conjecture,
~ ! [A,B] :
( ! [Y] :
( q(Y)
=> p(Y) )
=> ? [X] :
( ( q(X)
=> p(B) )
& ( p(X)
=> p(A) ) ) ),
inference(assume_negation,[status(cth)],[prove_this]) ).
fof(nnf_1,plain,
? [A,B] :
( ! [X] :
( ( ~ p(B)
& q(X) )
| ( ~ p(A)
& p(X) ) )
& ! [Y] :
( p(Y)
| ~ q(Y) ) ),
inference(fof_nnf,[status(thm)],[prove_this_neg]) ).
fof(sk_prove_this_neg_sk,plain,
( ! [X] :
( ( ~ p(sK1)
& q(X) )
| ( ~ p(sK0)
& p(X) ) )
& ! [Y] :
( p(Y)
| ~ q(Y) ) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK0,sK1]),skolemize(A,sK0),skolemize(B,sK1)],[nnf_1]) ).
fof(sk_prove_this_neg,plain,
( ( ~ p(sK1)
| ~ p(sK0) )
& ! [VAR_0] :
( q(VAR_0)
| ~ p(sK0) )
& ! [VAR_0] :
( ~ p(sK1)
| p(VAR_0) )
& ! [VAR_0] :
( q(VAR_0)
| p(VAR_0) )
& ! [VAR_0] :
( p(VAR_0)
| ~ q(VAR_0) ) ),
inference(cnf_transformation,[status(thm)],[sk_prove_this_neg_sk]) ).
cnf(c_2,negated_conjecture,
( q(A)
| p(A) ),
inference(split_conjunct,[status(thm)],[sk_prove_this_neg]) ).
cnf(c_3,negated_conjecture,
( p(A)
| ~ q(A) ),
inference(split_conjunct,[status(thm)],[sk_prove_this_neg]) ).
cnf(c_5,negated_conjecture,
( p(A)
| p(A) ),
inference(resolve,[status(thm)],[c_2,c_3]) ).
cnf(c_6,negated_conjecture,
p(A),
inference(copy,[status(thm)],[c_5]) ).
cnf(c_7,negated_conjecture,
( ~ p(sK1)
| ~ p(sK0) ),
inference(split_conjunct,[status(thm)],[sk_prove_this_neg]) ).
cnf(c_9,negated_conjecture,
~ p(sK1),
inference(resolve,[status(thm)],[c_6,c_7]) ).
cnf(c_8,negated_conjecture,
$false,
inference(resolve,[status(thm)],[c_6,c_9]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.02 % Problem : SYN950+1 : TPTP v9.3.1. Released v3.1.0.
% 0.00/0.03 % Command : prover9 -casc 300 -f /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.09/5.38 % Computer : n016.cluster.edu
% 0.09/5.38 % Model : x86_64 x86_64
% 0.09/5.38 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.09/5.38 % Memory : 8046.5625MB
% 0.09/5.38 % OS : Linux 6.8.0-71-generic
% 0.08/15.41 % CPULimit : 300
% 0.08/15.41 % WCLimit : 300
% 0.08/15.41 % DateTime : Sat Sep 26 18:51:49 UTC 2026
% 0.08/15.41 % CPUTime :
% 0.08/15.41 % Prover9 (64) version 2026-6A, July 2026, CASC-J13.
% 0.08/15.41 % Process 1953416 was started by sandbox on n019,
% 0.08/15.41 % Sat Sep 26 18:51:49 2026
% 0.08/15.41 % The command was "/export/starexec/sandbox/solver/bin/prover9 -casc 300 -f /export/starexec/sandbox/benchmark/theBenchmark.p".
% 0.08/15.42
% 0.08/15.42 % From the command line: assign(max_seconds, 300).
% 0.08/15.42
% 0.08/15.42 % SZS status Theorem for theBenchmark
% 0.08/15.42
% 0.08/15.42 % Proof 1 at 0.00 (+ 0.00) seconds.
% 0.08/15.42 % Length of proof is 7.
% 0.08/15.42 % Level of proof is 4.
% 0.08/15.42 % Maximum clause weight is 2.000.
% 0.08/15.42 % Given clauses 0.
% 0.08/15.42
% 0.08/15.42 % SZS output start CNFRefutation for theBenchmark
% See solution above
%------------------------------------------------------------------------------