%------------------------------------------------------------------------------
% File : Prover9---2026-6A
% Problem : GEO221+2 : TPTP v9.3.1. Released v3.3.0.
% Transfm : none
% Format : tptp:raw
% Command : prover9 -casc 300 -f /export/starexec/sandbox2/benchmark/theBenchmark.p
% Computer : n014.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 07:17:34 AM UTC 2026
% Result : Theorem 0.08s 0.37s
% Output : CNFRefutation 0.08s
% Verified :
% SZS Type : Refutation
% Derivation depth : 9
% Number of leaves : 4
% Syntax : Number of formulae : 17 ( 8 unt; 0 def)
% Number of atoms : 35 ( 0 equ)
% Maximal formula atoms : 5 ( 2 avg)
% Number of connectives : 35 ( 17 ~; 13 |; 2 &)
% ( 0 <=>; 3 =>; 0 <=; 0 <~>)
% Maximal formula depth : 9 ( 4 avg)
% Maximal term depth : 2 ( 1 avg)
% Number of predicates : 4 ( 3 usr; 1 prp; 0-2 aty)
% Number of functors : 4 ( 4 usr; 3 con; 0-2 aty)
% Number of variables : 30 ( 2 sgn 14 !; 3 ?)
% Comments :
%------------------------------------------------------------------------------
fof(ooc1,axiom,
! [A,L] : ~ unorthogonal_lines(orthogonal_through_point(L,A),L),
file('theBenchmark.p',ooc1) ).
fof(ooc2,axiom,
! [A,L] : ~ apart_point_and_line(A,orthogonal_through_point(L,A)),
file('theBenchmark.p',ooc2) ).
fof(ouo1,axiom,
! [A,L,M,N] :
( distinct_lines(L,M)
=> ( unorthogonal_lines(M,N)
| unorthogonal_lines(L,N)
| apart_point_and_line(A,M)
| apart_point_and_line(A,L) ) ),
file('theBenchmark.p',ouo1) ).
fof(con,conjecture,
! [A,B,L] :
( ~ apart_point_and_line(B,orthogonal_through_point(L,A))
=> ~ distinct_lines(orthogonal_through_point(L,A),orthogonal_through_point(L,B)) ),
file('theBenchmark.p',con) ).
fof(con_neg,negated_conjecture,
~ ! [A,B,L] :
( ~ apart_point_and_line(B,orthogonal_through_point(L,A))
=> ~ distinct_lines(orthogonal_through_point(L,A),orthogonal_through_point(L,B)) ),
inference(assume_negation,[status(cth)],[con]) ).
cnf(c_43,plain,
~ unorthogonal_lines(orthogonal_through_point(A,B),A),
inference(clausify,[status(thm)],[ooc1]) ).
cnf(c_44,plain,
~ apart_point_and_line(A,orthogonal_through_point(B,A)),
inference(clausify,[status(thm)],[ooc2]) ).
cnf(c_45,plain,
( unorthogonal_lines(B,D)
| unorthogonal_lines(A,D)
| apart_point_and_line(C,B)
| apart_point_and_line(C,A)
| ~ distinct_lines(A,B) ),
inference(clausify,[status(thm)],[ouo1]) ).
fof(nnf_21,plain,
? [A,B,L] :
( distinct_lines(orthogonal_through_point(L,A),orthogonal_through_point(L,B))
& ~ apart_point_and_line(B,orthogonal_through_point(L,A)) ),
inference(fof_nnf,[status(thm)],[con_neg]) ).
fof(sk_con_neg,plain,
( distinct_lines(orthogonal_through_point(sK1,sK2),orthogonal_through_point(sK1,sK0))
& ~ apart_point_and_line(sK0,orthogonal_through_point(sK1,sK2)) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK0,sK1,sK2]),skolemize(A,sK2),skolemize(B,sK0),skolemize(L,sK1)],[nnf_21]) ).
cnf(c_46,negated_conjecture,
~ apart_point_and_line(sK0,orthogonal_through_point(sK1,sK2)),
inference(split_conjunct,[status(thm)],[sk_con_neg]) ).
cnf(c_47,negated_conjecture,
distinct_lines(orthogonal_through_point(sK1,sK2),orthogonal_through_point(sK1,sK0)),
inference(split_conjunct,[status(thm)],[sk_con_neg]) ).
cnf(c_55,negated_conjecture,
( unorthogonal_lines(A,B)
| unorthogonal_lines(orthogonal_through_point(sK1,sK2),B)
| apart_point_and_line(sK0,A)
| ~ distinct_lines(orthogonal_through_point(sK1,sK2),A) ),
inference(resolve,[status(thm)],[c_45,c_46]) ).
cnf(c_56,negated_conjecture,
( unorthogonal_lines(orthogonal_through_point(A,sK0),B)
| unorthogonal_lines(orthogonal_through_point(sK1,sK2),B)
| ~ distinct_lines(orthogonal_through_point(sK1,sK2),orthogonal_through_point(A,sK0)) ),
inference(resolve,[status(thm)],[c_55,c_44]) ).
cnf(c_57,negated_conjecture,
( unorthogonal_lines(orthogonal_through_point(A,sK0),sK1)
| ~ distinct_lines(orthogonal_through_point(sK1,sK2),orthogonal_through_point(A,sK0)) ),
inference(resolve,[status(thm)],[c_56,c_43]) ).
cnf(c_58,negated_conjecture,
~ distinct_lines(orthogonal_through_point(sK1,sK2),orthogonal_through_point(sK1,sK0)),
inference(resolve,[status(thm)],[c_57,c_43]) ).
cnf(c_54,negated_conjecture,
$false,
inference(resolve,[status(thm)],[c_47,c_58]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.02 % Problem : GEO221+2 : TPTP v9.3.1. Released v3.3.0.
% 0.00/0.03 % Command : prover9 -casc 300 -f /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.08/0.35 % Computer : n014.cluster.edu
% 0.08/0.35 % Model : x86_64 x86_64
% 0.08/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.08/0.35 % Memory : 8046.5625MB
% 0.08/0.35 % OS : Linux 6.8.0-71-generic
% 0.08/0.35 % CPULimit : 300
% 0.08/0.35 % WCLimit : 300
% 0.08/0.35 % DateTime : Fri Sep 25 13:07:33 UTC 2026
% 0.08/0.35 % CPUTime :
% 0.08/0.35 % Prover9 (64) version 2026-6A, July 2026, CASC-J13.
% 0.08/0.35 % Process 291780 was started by sandbox2 on n014,
% 0.08/0.35 % Fri Sep 25 13:07:33 2026
% 0.08/0.35 % The command was "/export/starexec/sandbox2/solver/bin/prover9 -casc 300 -f /export/starexec/sandbox2/benchmark/theBenchmark.p".
% 0.08/0.36
% 0.08/0.36 % From the command line: assign(max_seconds, 300).
% 0.08/0.37
% 0.08/0.37 % SZS status Theorem for theBenchmark
% 0.08/0.37
% 0.08/0.37 % Proof 1 at 0.00 (+ 0.00) seconds.
% 0.08/0.37 % Length of proof is 10.
% 0.08/0.37 % Level of proof is 2.
% 0.08/0.37 % Maximum clause weight is 15.000.
% 0.08/0.37 % Given clauses 25.
% 0.08/0.37
% 0.08/0.37 % SZS output start CNFRefutation for theBenchmark
% See solution above
%------------------------------------------------------------------------------