%------------------------------------------------------------------------------
% File : iProver---3.9.4
% Problem : PUZ020-1 : TPTP v9.3.1. Released v1.0.0.
% Transfm : none
% Format : tptp:raw
% Command : run_iprover 300 /export/starexec/sandbox2/benchmark/theBenchmark.p THM
% Computer : n013.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 : Fri Sep 25 02:32:43 PM UTC 2026
% Result : Unsatisfiable 1.17s 1.27s
% Output : CNFRefutation 1.17s
% Verified :
% SZS Type : Refutation
% Derivation depth : 3
% Number of leaves : 5
% Syntax : Number of formulae : 12 ( 5 unt; 0 def)
% Number of atoms : 22 ( 0 equ)
% Maximal formula atoms : 3 ( 1 avg)
% Number of connectives : 20 ( 10 ~; 10 |; 0 &)
% ( 0 <=>; 0 =>; 0 <=; 0 <~>)
% Maximal formula depth : 5 ( 3 avg)
% Maximal term depth : 2 ( 1 avg)
% Number of types : 1 ( 0 usr)
% Number of type conns : 0 ( 0 >; 0 *; 0 +; 0 <<)
% Number of predicates : 4 ( 3 usr; 1 prp; 0-1 aty)
% Number of functors : 3 ( 3 usr; 2 con; 0-1 aty)
% Number of variables : 2 ( 0 sgn 2 !; 0 ?; 1 :)
% Comments :
%------------------------------------------------------------------------------
fof(f9,axiom,
! [X0] :
( knight(X0)
| ~ a_truth(statement_by(X0))
| ~ person(X0) ),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p',knights_make_true_statements) ).
fof(f13,axiom,
person(husband),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p',husband) ).
fof(f19,axiom,
( knight(wife)
| a_truth(statement_by(husband)) ),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p',knight_wife_or_truthful_husband) ).
fof(f20,axiom,
( a_truth(statement_by(husband))
| ~ knight(wife) ),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p',knight_wife_means_truthful_husband) ).
fof(f21,negated_conjecture,
~ knight(husband),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p',prove_knight_husband) ).
tcf(c_73,plain,
! [X0: $i] :
( knight(X0)
| ~ person(X0)
| ~ a_truth(statement_by(X0)) ),
inference(cnf_transformation,[],[f9]) ).
tcf(c_77,plain,
person(husband),
inference(cnf_transformation,[],[f13]) ).
tcf(c_83,plain,
( knight(wife)
| a_truth(statement_by(husband)) ),
inference(cnf_transformation,[],[f19]) ).
tcf(c_84,plain,
( a_truth(statement_by(husband))
| ~ knight(wife) ),
inference(cnf_transformation,[],[f20]) ).
tcf(c_85,negated_conjecture,
~ knight(husband),
inference(cnf_transformation,[],[f21]) ).
tcf(c_90,plain,
( knight(husband)
| ~ person(husband)
| ~ a_truth(statement_by(husband)) ),
inference(instantiation,[status(thm)],[c_73]) ).
tcf(c_91,plain,
$false,
inference(prop_impl_just,[status(thm)],[c_90,c_84,c_83,c_85,c_77]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : PUZ020-1 : TPTP v9.3.1. Released v1.0.0.
% 0.00/0.04 % Command : run_iprover 300 /export/starexec/sandbox2/benchmark/theBenchmark.p THM
% 0.11/0.35 % Computer : n013.cluster.edu
% 0.11/0.35 % Model : x86_64 x86_64
% 0.11/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.11/0.35 % Memory : 8046.5625MB
% 0.11/0.35 % OS : Linux 6.8.0-71-generic
% 0.11/0.35 % CPULimit : 300
% 0.11/0.35 % WCLimit : 300
% 0.11/0.35 % DateTime : Thu Sep 24 06:39:24 UTC 2026
% 0.11/0.36 % CPUTime :
% 0.11/0.36 Running run_iprover 300 /export/starexec/sandbox2/benchmark/theBenchmark.p THM
% 0.14/0.40 Running first-order theorem proving
% 0.14/0.40 Running: /export/starexec/sandbox2/solver/bin/iproveropt-multi-core.sh -d -n -l tptp -s fof_schedule -t 300 /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.14/0.41
% 0.14/0.41 % ======== iProver multi-core TPTP/SMT =========
% 0.14/0.41
% 0.14/0.41 % Detected problem language: tptp
% 0.14/0.42 % Proving...
% 1.17/1.27 % SZS status Started for theBenchmark.p
% 1.17/1.27 % SZS status Unsatisfiable for theBenchmark.p
% 1.17/1.27
% 1.17/1.27 %---------------- iProver v3.9.4 (pre CASC 2026/SMT-COMP 2026) ----------------%
% 1.17/1.27
% 1.17/1.27 % ------ iProver source info
% 1.17/1.27
% 1.17/1.27 % git: date: 2026-07-19 20:42:38 +0200
% 1.17/1.27 % git: sha1: 804e7d636a263075307957e923b7a22a4035de61
% 1.17/1.27 % git: non_committed_changes: false
% 1.17/1.27
% 1.17/1.27 % ------ Parsing...% successful
% 1.17/1.27
% 1.17/1.27
% 1.17/1.27 % ------ Clausification by vclausify_rel & Parsing by iProver...%
% 1.17/1.27
% 1.17/1.27 % ------ Preprocessing...%
% 1.17/1.27
% 1.17/1.27 % SZS status Unsatisfiable for theBenchmark.p
% 1.17/1.27
% 1.17/1.27 % SZS output start CNFRefutation for theBenchmark.p
% See solution above
% 1.17/1.27
% 1.17/1.27
%------------------------------------------------------------------------------