%------------------------------------------------------------------------------
% File : ConnectPP---0.7.2
% Problem : SYN073+1 : TPTP v9.3.1. Released v2.0.0.
% Transfm : none
% Format : tptp:raw
% Command : /export/starexec/sandbox/solver/bin/connect++ --verbosity 1 --no-colour --tptp-proof --schedule default --timeout 300 /export/starexec/sandbox/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 : Thu Sep 24 09:09:24 AM UTC 2026
% Result : Theorem 0.10s 0.38s
% Output : Proof 0.10s
% Verified :
% SZS Type : Refutation
% Derivation depth : 8
% Number of leaves : 1
% Syntax : Number of formulae : 13 ( 5 unt; 0 def)
% Number of atoms : 27 ( 0 equ)
% Maximal formula atoms : 3 ( 2 avg)
% Number of connectives : 22 ( 8 ~; 8 |; 5 &)
% ( 0 <=>; 1 =>; 0 <=; 0 <~>)
% Maximal formula depth : 5 ( 3 avg)
% Maximal term depth : 3 ( 1 avg)
% Number of predicates : 2 ( 1 usr; 1 prp; 0-2 aty)
% Number of functors : 2 ( 2 usr; 1 con; 0-1 aty)
% Number of variables : 25 ( 1 sgn 18 !; 4 ?)
% Comments :
%------------------------------------------------------------------------------
fof(pel50,conjecture,
( ! [X] :
( ! [Y] : big_f(X,Y)
| big_f(a,X) )
=> ? [X1] :
! [Y1] : big_f(X1,Y1) ),
file('theBenchmark.p',pel50) ).
fof(f_1_1,negated_conjecture,
( ~ ? [X1] :
! [Y1] : big_f(X1,Y1)
& ! [X] :
( ! [Y] : big_f(X,Y)
| big_f(a,X) ) ),
inference(negate,[status(cth)],[pel50]) ).
fof(f_1_2,negated_conjecture,
( ! [X1] :
? [Y1] : ~ big_f(X1,Y1)
& ! [X] :
( ! [Y] : big_f(X,Y)
| big_f(a,X) ) ),
inference(fof_nnf,[status(thm)],[f_1_1]) ).
fof(f_1_3,negated_conjecture,
( ! [U_3] :
? [U_2] : ~ big_f(U_3,U_2)
& ! [U_1] :
( ! [U_0] : big_f(U_1,U_0)
| big_f(a,U_1) ) ),
inference(variable_rename,[status(thm)],[f_1_2]) ).
fof(f_1_4,negated_conjecture,
( ! [U_3] : ~ big_f(U_3,sK1(U_3))
& ! [U_1] :
( ! [U_0] : big_f(U_1,U_0)
| big_f(a,U_1) ) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK1]),skolemize(U_2,sK1(U_3))],[f_1_3]) ).
fof(f_1_5,negated_conjecture,
( ! [U_3] : ~ big_f(U_3,sK1(U_3))
& ! [U_1,U_0] :
( big_f(U_1,U_0)
| big_f(a,U_1) ) ),
inference(definitional_conversion,[status(esa)],[f_1_4]) ).
cnf(f_1_6,negated_conjecture,
( big_f(U_1,U_0)
| big_f(a,U_1) ),
inference(clausify,[status(thm)],[f_1_5]) ).
cnf(f_1_7,negated_conjecture,
~ big_f(U_3,sK1(U_3)),
inference(clausify,[status(thm)],[f_1_5]) ).
cnf(t1,plain,
~ big_f(sK1(a),sK1(sK1(a))),
inference(start,[status(thm),parent(0:0)],[f_1_7]) ).
cnf(t2,plain,
( big_f(a,sK1(a))
| big_f(sK1(a),sK1(sK1(a))) ),
inference(extension,[status(thm),parent(t1:1)],[f_1_6]) ).
cnf(t3,plain,
$false,
inference(connection,[status(thm),parent(t2:1)],[t2:1,t1:1]) ).
cnf(t4,plain,
~ big_f(a,sK1(a)),
inference(extension,[status(thm),parent(t2:2)],[f_1_7]) ).
cnf(t5,plain,
$false,
inference(connection,[status(thm),parent(t4:1)],[t4:1,t2:2]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : SYN073+1 : TPTP v9.3.1. Released v2.0.0.
% 0.00/0.03 This is a FOF_THM_RFO_NEQ problem
% 0.00/0.04 % Command : /export/starexec/sandbox/solver/bin/connect++ --verbosity 1 --no-colour --tptp-proof --schedule default --timeout 300 /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.10/0.36 % Computer : n018.cluster.edu
% 0.10/0.36 % Model : x86_64 x86_64
% 0.10/0.36 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.10/0.36 % Memory : 8046.5625MB
% 0.10/0.36 % OS : Linux 6.8.0-71-generic
% 0.10/0.36 % CPULimit : 300
% 0.10/0.36 % WCLimit : 300
% 0.10/0.36 % DateTime : Sun Sep 20 06:26:13 UTC 2026
% 0.10/0.36 % CPUTime :
% 0.10/0.38 % SZS status Theorem for theBenchmark
% 0.10/0.38 % SZS output start Proof for theBenchmark
% See solution above
%------------------------------------------------------------------------------