%------------------------------------------------------------------------------
% File : iProver---3.9.4
% Problem : SET885+1 : TPTP v9.3.1. Released v3.2.0.
% Transfm : none
% Format : tptp:raw
% Command : run_iprover 300 /export/starexec/sandbox/benchmark/theBenchmark.p THM
% Computer : n011.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 02:48:53 PM UTC 2026
% Result : Theorem 1.78s 6.28s
% Output : CNFRefutation 1.78s
% Verified :
% SZS Type : Refutation
% Derivation depth : 10
% Number of leaves : 6
% Syntax : Number of formulae : 39 ( 10 unt; 2 def)
% Number of atoms : 161 ( 82 equ)
% Maximal formula atoms : 14 ( 4 avg)
% Number of connectives : 182 ( 69 ~; 72 |; 31 &)
% ( 5 <=>; 5 =>; 0 <=; 0 <~>)
% Maximal formula depth : 11 ( 5 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 : 6 ( 4 usr; 3 prp; 0-2 aty)
% Number of functors : 7 ( 7 usr; 3 con; 0-3 aty)
% Number of variables : 85 ( 0 sgn 77 !; 8 ?; 13 :)
% Comments :
%------------------------------------------------------------------------------
fof(f3,axiom,
! [X0,X1] :
( X1 = singleton(X0)
<=> ! [X2] :
( in(X2,X1)
<=> X2 = X0 ) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',d1_tarski) ).
fof(f4,axiom,
! [X0,X1,X2] :
( X2 = unordered_pair(X0,X1)
<=> ! [X3] :
( in(X3,X2)
<=> ( X3 = X1
| X3 = X0 ) ) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',d2_tarski) ).
fof(f5,axiom,
! [X0,X1] :
( subset(X0,X1)
<=> ! [X2] :
( in(X2,X0)
=> in(X2,X1) ) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',d3_tarski) ).
fof(f9,conjecture,
! [X0,X1,X2] :
( subset(unordered_pair(X0,X1),singleton(X2))
=> X0 = X2 ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',t26_zfmisc_1) ).
fof(f10,negated_conjecture,
~ ! [X0,X1,X2] :
( subset(unordered_pair(X0,X1),singleton(X2))
=> X0 = X2 ),
inference(negated_conjecture,[status(cth)],[f9]) ).
fof(f12,plain,
! [X0,X1] :
( subset(X0,X1)
=> ! [X2] :
( in(X2,X0)
=> in(X2,X1) ) ),
inference(unused_predicate_definition_removal,[],[f5]) ).
fof(f14,plain,
! [X0,X1] :
( ~ subset(X0,X1)
| ! [X2] :
( ~ in(X2,X0)
| in(X2,X1) ) ),
inference(ennf_transformation,[],[f12]) ).
fof(f15,plain,
? [X0,X1,X2] :
( subset(unordered_pair(X0,X1),singleton(X2))
& X0 != X2 ),
inference(ennf_transformation,[],[f10]) ).
fof(f16,plain,
! [X0,X1] :
( ( singleton(X0) != X1
| ! [X2] :
( ( ~ in(X2,X1)
| X2 = X0 )
& ( X0 != X2
| in(X2,X1) ) ) )
& ( ? [X2] :
( ( in(X2,X1)
| X2 = X0 )
& ( ~ in(X2,X1)
| X0 != X2 ) )
| X1 = singleton(X0) ) ),
inference(nnf_transformation,[],[f3]) ).
fof(f17,plain,
! [X0,X1] :
( ( singleton(X0) != X1
| ! [X3] :
( ( ~ in(X3,X1)
| X0 = X3 )
& ( X0 != X3
| in(X3,X1) ) ) )
& ( ? [X2] :
( ( in(X2,X1)
| X2 = X0 )
& ( ~ in(X2,X1)
| X0 != X2 ) )
| X1 = singleton(X0) ) ),
inference(rectify,[],[f16]) ).
fof(f18,plain,
! [X0,X1] :
( ( singleton(X0) != X1
| ! [X3] :
( ( ~ in(X3,X1)
| X0 = X3 )
& ( X0 != X3
| in(X3,X1) ) ) )
& ( ( ( in(sK0(X0,X1),X1)
| sK0(X0,X1) = X0 )
& ( ~ in(sK0(X0,X1),X1)
| sK0(X0,X1) != X0 ) )
| X1 = singleton(X0) ) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK0]),skolemize(X2,sK0(X0,X1))],[f17]) ).
fof(f19,plain,
! [X0,X1,X2] :
( ( unordered_pair(X0,X1) != X2
| ! [X3] :
( ( ~ in(X3,X2)
| X3 = X1
| X3 = X0 )
& ( ( X1 != X3
& X0 != X3 )
| in(X3,X2) ) ) )
& ( ? [X3] :
( ( in(X3,X2)
| X3 = X1
| X3 = X0 )
& ( ~ in(X3,X2)
| ( X1 != X3
& X0 != X3 ) ) )
| X2 = unordered_pair(X0,X1) ) ),
inference(nnf_transformation,[],[f4]) ).
fof(f20,plain,
! [X0,X1,X2] :
( ( unordered_pair(X0,X1) != X2
| ! [X3] :
( ( ~ in(X3,X2)
| X3 = X1
| X3 = X0 )
& ( ( X1 != X3
& X0 != X3 )
| in(X3,X2) ) ) )
& ( ? [X3] :
( ( in(X3,X2)
| X3 = X1
| X3 = X0 )
& ( ~ in(X3,X2)
| ( X1 != X3
& X0 != X3 ) ) )
| X2 = unordered_pair(X0,X1) ) ),
inference(flattening,[],[f19]) ).
fof(f21,plain,
! [X0,X1,X2] :
( ( unordered_pair(X0,X1) != X2
| ! [X4] :
( ( ~ in(X4,X2)
| X1 = X4
| X0 = X4 )
& ( ( X1 != X4
& X0 != X4 )
| in(X4,X2) ) ) )
& ( ? [X3] :
( ( in(X3,X2)
| X3 = X1
| X3 = X0 )
& ( ~ in(X3,X2)
| ( X1 != X3
& X0 != X3 ) ) )
| X2 = unordered_pair(X0,X1) ) ),
inference(rectify,[],[f20]) ).
fof(f22,plain,
! [X0,X1,X2] :
( ( unordered_pair(X0,X1) != X2
| ! [X4] :
( ( ~ in(X4,X2)
| X1 = X4
| X0 = X4 )
& ( ( X1 != X4
& X0 != X4 )
| in(X4,X2) ) ) )
& ( ( ( in(sK1(X0,X1,X2),X2)
| sK1(X0,X1,X2) = X1
| sK1(X0,X1,X2) = X0 )
& ( ~ in(sK1(X0,X1,X2),X2)
| ( sK1(X0,X1,X2) != X1
& sK1(X0,X1,X2) != X0 ) ) )
| X2 = unordered_pair(X0,X1) ) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK1]),skolemize(X3,sK1(X0,X1,X2))],[f21]) ).
fof(f25,plain,
( subset(unordered_pair(sK4,sK5),singleton(sK6))
& sK4 != sK6 ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK4,sK5,sK6]),skolemize(X0,sK4),skolemize(X1,sK5),skolemize(X2,sK6)],[f15]) ).
fof(f28,plain,
! [X3,X0,X1] :
( singleton(X0) != X1
| ~ in(X3,X1)
| X0 = X3 ),
inference(cnf_transformation,[],[f18]) ).
fof(f34,plain,
! [X2,X0,X1,X4] :
( unordered_pair(X0,X1) != X2
| X0 != X4
| in(X4,X2) ),
inference(cnf_transformation,[],[f22]) ).
fof(f38,plain,
! [X2,X0,X1] :
( ~ subset(X0,X1)
| ~ in(X2,X0)
| in(X2,X1) ),
inference(cnf_transformation,[],[f14]) ).
fof(f42,plain,
subset(unordered_pair(sK4,sK5),singleton(sK6)),
inference(cnf_transformation,[],[f25]) ).
fof(f43,plain,
sK4 != sK6,
inference(cnf_transformation,[],[f25]) ).
fof(f46,plain,
! [X3,X0] :
( ~ in(X3,singleton(X0))
| X0 = X3 ),
inference(equality_resolution,[],[f28]) ).
fof(f47,plain,
! [X2,X1,X4] :
( unordered_pair(X4,X1) != X2
| in(X4,X2) ),
inference(equality_resolution,[],[f34]) ).
fof(f48,plain,
! [X1,X4] : in(X4,unordered_pair(X4,X1)),
inference(equality_resolution,[],[f47]) ).
tcf(c_54,plain,
! [X0: $i,X1: $i] :
( ( X0 = X1 )
| ~ in(X0,singleton(X1)) ),
inference(cnf_transformation,[],[f46]) ).
tcf(c_58,plain,
! [X0: $i,X1: $i] : in(X0,unordered_pair(X0,X1)),
inference(cnf_transformation,[],[f48]) ).
tcf(c_61,plain,
! [X0: $i,X1: $i,X2: $i] :
( in(X0,X2)
| ~ subset(X1,X2)
| ~ in(X0,X1) ),
inference(cnf_transformation,[],[f38]) ).
tcf(c_65,negated_conjecture,
sK4 != sK6,
inference(cnf_transformation,[],[f43]) ).
tcf(c_66,negated_conjecture,
subset(unordered_pair(sK4,sK5),singleton(sK6)),
inference(cnf_transformation,[],[f42]) ).
tcf(c_213,plain,
! [X0: $i,X1: $i,X2: $i] :
( in(X2,X1)
| ~ in(X2,X0)
| ( singleton(sK6) != X1 )
| ( unordered_pair(sK4,sK5) != X0 ) ),
inference(resolution_lifted,[status(thm)],[c_61,c_66]) ).
tcf(c_214,plain,
! [X0: $i] :
( in(X0,singleton(sK6))
| ~ in(X0,unordered_pair(sK4,sK5)) ),
inference(unflattening,[status(thm)],[c_213]) ).
tcf(c_340,definition,
iPr_def_10 = unordered_pair(sK4,sK5),
introduced(definition,[new_symbols(definition,[iPr_def_10])],[]) ).
tcf(c_341,definition,
iPr_def_11 = singleton(sK6),
introduced(definition,[new_symbols(definition,[iPr_def_11])],[]) ).
tcf(c_342,plain,
! [X0: $i] :
( in(X0,iPr_def_11)
| ~ in(X0,iPr_def_10) ),
inference(demodulation,[status(thm)],[c_214,c_341,c_340]) ).
tcf(c_353,plain,
( in(sK4,iPr_def_11)
| ~ in(sK4,iPr_def_10) ),
inference(instantiation,[status(thm)],[c_342]) ).
tcf(c_544,plain,
in(sK4,iPr_def_10),
inference(superposition,[status(thm)],[c_340,c_58]) ).
tcf(c_564,plain,
! [X0: $i] :
( ( X0 = sK6 )
| ~ in(X0,iPr_def_11) ),
inference(superposition,[status(thm)],[c_341,c_54]) ).
tcf(c_567,plain,
( ( sK4 = sK6 )
| ~ in(sK4,iPr_def_11) ),
inference(instantiation,[status(thm)],[c_564]) ).
tcf(c_568,plain,
$false,
inference(prop_impl_just,[status(thm)],[c_567,c_544,c_353,c_65]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : SET885+1 : TPTP v9.3.1. Released v3.2.0.
% 0.00/0.04 % Command : run_iprover 300 /export/starexec/sandbox/benchmark/theBenchmark.p THM
% 0.11/5.37 % Computer : n011.cluster.edu
% 0.11/5.37 % Model : x86_64 x86_64
% 0.11/5.37 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.11/5.37 % Memory : 8046.5625MB
% 0.11/5.37 % OS : Linux 6.8.0-71-generic
% 0.11/5.37 % CPULimit : 300
% 0.11/5.37 % WCLimit : 300
% 0.11/5.37 % DateTime : Thu Sep 24 12:19:49 UTC 2026
% 0.11/5.37 % CPUTime :
% 0.11/5.37 Running run_iprover 300 /export/starexec/sandbox/benchmark/theBenchmark.p THM
% 0.13/5.40 Running first-order theorem proving
% 0.13/5.40 Running: /export/starexec/sandbox/solver/bin/iproveropt-multi-core.sh -d -n -l tptp -s fof_schedule -t 300 /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.13/5.41
% 0.13/5.41 % ======== iProver multi-core TPTP/SMT =========
% 0.13/5.41
% 0.13/5.42 % Detected problem language: tptp
% 0.13/5.43 % Proving...
% 1.78/6.28 % SZS status Started for theBenchmark.p
% 1.78/6.28 % SZS status Theorem for theBenchmark.p
% 1.78/6.28
% 1.78/6.28 %---------------- iProver v3.9.4 (pre CASC 2026/SMT-COMP 2026) ----------------%
% 1.78/6.28
% 1.78/6.28 % ------ iProver source info
% 1.78/6.28
% 1.78/6.28 % git: date: 2026-07-19 20:42:38 +0200
% 1.78/6.28 % git: sha1: 804e7d636a263075307957e923b7a22a4035de61
% 1.78/6.28 % git: non_committed_changes: false
% 1.78/6.28
% 1.78/6.28 % ------ Parsing...
% 1.78/6.28 % ------ Clausification by vclausify_rel & Parsing by iProver...%
% 1.78/6.28
% 1.78/6.28 % ------ Preprocessing... sup_sim: 0 sf_s rm: 1 0s sf_e pe_s pe:1:0s pe:2:0s pe_e sup_sim: 0 sf_s rm: 3 0s sf_e pe_s pe_e %
% 1.78/6.28
% 1.78/6.28 % ------ Preprocessing... gs_s sp: 0 0s gs_e snvd_s sp: 0 0s snvd_e %
% 1.78/6.28
% 1.78/6.28 % ------ Preprocessing... sf_s rm: 1 0s sf_e sf_s rm: 0 0s sf_e
% 1.78/6.28 % ------ Proving...
% 1.78/6.28 % ------ Problem Properties
% 1.78/6.28
% 1.78/6.28 %
% 1.78/6.28 % clauses 17
% 1.78/6.28 % conjectures 1
% 1.78/6.28 % EPR 4
% 1.78/6.28 % Horn 14
% 1.78/6.28 % unary 8
% 1.78/6.28 % binary 3
% 1.78/6.28 % lits 33
% 1.78/6.28 % lits eq 19
% 1.78/6.28 % fd_pure 0
% 1.78/6.28 % fd_pseudo 0
% 1.78/6.28 % fd_cond 0
% 1.78/6.28 % fd_pseudo_cond 5
% 1.78/6.28 % AC symbols 0
% 1.78/6.28
% 1.78/6.28 % ------ Schedule dynamic 5 is on
% 1.78/6.28
% 1.78/6.28 % ------ Input Options "--resolution_flag false --inst_lit_sel_side none" Time Limit: 10.
% 1.78/6.28
% 1.78/6.28
% 1.78/6.28 % ------
% 1.78/6.28 % Current options:
% 1.78/6.28 % ------
% 1.78/6.28
% 1.78/6.28
% 1.78/6.28 %
% 1.78/6.28
% 1.78/6.28 % ------ Proving...
% 1.78/6.28 %
% 1.78/6.28
% 1.78/6.28 % SZS status Theorem for theBenchmark.p
% 1.78/6.28
% 1.78/6.28 % SZS output start CNFRefutation for theBenchmark.p
% See solution above
% 1.78/6.28
% 1.78/6.28
%------------------------------------------------------------------------------