%------------------------------------------------------------------------------
% File : Vampire---5.0.1
% Problem : GRP497-1 : TPTP v9.3.1. Released v2.6.0.
% Transfm : none
% Format : tptp:raw
% Command : run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% Computer : n012.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 : Tue Sep 29 10:14:09 AM UTC 2026
% Result : Unsatisfiable 0.08s 15.95s
% Output : Refutation 0.08s
% Verified :
% SZS Type : Refutation
% Derivation depth : 21
% Number of leaves : 14
% Syntax : Number of formulae : 65 ( 65 unt; 9 def)
% Number of atoms : 65 ( 64 equ)
% Maximal formula atoms : 1 ( 1 avg)
% Number of connectives : 5 ( 5 ~; 0 |; 0 &)
% ( 0 <=>; 0 =>; 0 <=; 0 <~>)
% Maximal formula depth : 4 ( 2 avg)
% Maximal term depth : 5 ( 2 avg)
% Number of predicates : 2 ( 0 usr; 1 prp; 0-2 aty)
% Number of functors : 14 ( 14 usr; 4 con; 0-3 aty)
% Number of variables : 70 ( 70 !; 0 ?)
% Comments :
%------------------------------------------------------------------------------
fof(f1,negated_conjecture,
! [X2,X0,X1] : double_divide(double_divide(identity,double_divide(X0,double_divide(X1,identity))),double_divide(double_divide(X1,double_divide(X2,X0)),identity)) = X2,
file('/export/starexec/sandbox/benchmark/theBenchmark.p',single_axiom) ).
fof(f2,negated_conjecture,
! [X0,X1] : multiply(X0,X1) = double_divide(double_divide(X1,X0),identity),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',multiply) ).
fof(f3,negated_conjecture,
! [X0] : inverse(X0) = double_divide(X0,identity),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',inverse) ).
fof(f4,negated_conjecture,
! [X0] : identity = double_divide(X0,inverse(X0)),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',identity) ).
fof(f5,negated_conjecture,
multiply(identity,a2) != a2,
file('/export/starexec/sandbox/benchmark/theBenchmark.p',prove_these_axioms_2) ).
fof(f6,plain,
a2 != multiply(identity,a2),
inference(reorient_equations,[],[f5]) ).
fof(f7,plain,
! [X0] : identity = double_divide(X0,double_divide(X0,identity)),
inference(definition_unfolding,[],[f4,f3]) ).
fof(f8,plain,
a2 != double_divide(double_divide(a2,identity),identity),
inference(definition_unfolding,[],[f6,f2]) ).
fof(f9,definition,
! [X1] : sF0(X1) = double_divide(X1,identity),
introduced(definition,[new_symbols(definition,[sF0])],[function_definition]) ).
fof(f10,plain,
! [X1] : double_divide(X1,identity) = sF0(X1),
inference(reorient_equations,[],[f9]) ).
fof(f11,definition,
! [X0,X1] : sF1(X0,X1) = double_divide(X0,sF0(X1)),
introduced(definition,[new_symbols(definition,[sF1])],[function_definition]) ).
fof(f12,plain,
! [X0,X1] : double_divide(X0,sF0(X1)) = sF1(X0,X1),
inference(reorient_equations,[],[f11]) ).
fof(f13,definition,
! [X0,X1] : sF2(X0,X1) = double_divide(identity,sF1(X0,X1)),
introduced(definition,[new_symbols(definition,[sF2])],[function_definition]) ).
fof(f14,plain,
! [X0,X1] : double_divide(identity,sF1(X0,X1)) = sF2(X0,X1),
inference(reorient_equations,[],[f13]) ).
fof(f15,definition,
! [X2,X0,X1] : sF3(X1,X2,X0) = double_divide(X1,double_divide(X2,X0)),
introduced(definition,[new_symbols(definition,[sF3])],[function_definition]) ).
fof(f16,plain,
! [X2,X0,X1] : double_divide(X1,double_divide(X2,X0)) = sF3(X1,X2,X0),
inference(reorient_equations,[],[f15]) ).
fof(f17,definition,
! [X2,X0,X1] : sF4(X1,X2,X0) = double_divide(sF3(X1,X2,X0),identity),
introduced(definition,[new_symbols(definition,[sF4])],[function_definition]) ).
fof(f18,plain,
! [X2,X0,X1] : double_divide(sF3(X1,X2,X0),identity) = sF4(X1,X2,X0),
inference(reorient_equations,[],[f17]) ).
fof(f19,definition,
! [X2,X0,X1] : sF5(X0,X1,X2) = double_divide(sF2(X0,X1),sF4(X1,X2,X0)),
introduced(definition,[new_symbols(definition,[sF5])],[function_definition]) ).
fof(f20,plain,
! [X2,X0,X1] : double_divide(sF2(X0,X1),sF4(X1,X2,X0)) = sF5(X0,X1,X2),
inference(reorient_equations,[],[f19]) ).
fof(f21,plain,
! [X2,X0,X1] : sF5(X0,X1,X2) = X2,
inference(definition_folding,[],[f1,f20,f18,f16,f14,f12,f10]) ).
fof(f22,definition,
! [X0] : sF6(X0) = double_divide(X0,sF0(X0)),
introduced(definition,[new_symbols(definition,[sF6])],[function_definition]) ).
fof(f23,plain,
! [X0] : double_divide(X0,sF0(X0)) = sF6(X0),
inference(reorient_equations,[],[f22]) ).
fof(f24,plain,
! [X0] : identity = sF6(X0),
inference(definition_folding,[],[f7,f23,f10]) ).
fof(f25,definition,
sF7 = double_divide(a2,identity),
introduced(definition,[new_symbols(definition,[sF7])],[function_definition]) ).
fof(f26,plain,
double_divide(a2,identity) = sF7,
inference(reorient_equations,[],[f25]) ).
fof(f27,definition,
sF8 = double_divide(sF7,identity),
introduced(definition,[new_symbols(definition,[sF8])],[function_definition]) ).
fof(f28,plain,
double_divide(sF7,identity) = sF8,
inference(reorient_equations,[],[f27]) ).
fof(f29,plain,
a2 != sF8,
inference(definition_folding,[],[f8,f28,f26]) ).
fof(f30,plain,
! [X0] : identity = double_divide(X0,sF0(X0)),
inference(forward_demodulation,[],[f24,f23]) ).
fof(f31,plain,
! [X2,X0,X1] : double_divide(sF2(X0,X1),sF4(X1,X2,X0)) = X2,
inference(forward_demodulation,[],[f21,f20]) ).
fof(f32,plain,
! [X0] : identity = double_divide(X0,double_divide(X0,identity)),
inference(forward_demodulation,[],[f30,f10]) ).
fof(f33,plain,
! [X2,X0,X1] : double_divide(sF2(X0,X1),double_divide(sF3(X1,X2,X0),identity)) = X2,
inference(forward_demodulation,[],[f31,f18]) ).
fof(f34,plain,
! [X2,X0,X1] : double_divide(sF2(X0,X1),double_divide(double_divide(X1,double_divide(X2,X0)),identity)) = X2,
inference(forward_demodulation,[],[f33,f16]) ).
fof(f35,plain,
! [X2,X0,X1] : double_divide(double_divide(identity,sF1(X0,X1)),double_divide(double_divide(X1,double_divide(X2,X0)),identity)) = X2,
inference(forward_demodulation,[],[f34,f14]) ).
fof(f36,plain,
! [X2,X0,X1] : double_divide(double_divide(identity,double_divide(X0,sF0(X1))),double_divide(double_divide(X1,double_divide(X2,X0)),identity)) = X2,
inference(forward_demodulation,[],[f35,f12]) ).
fof(f37,plain,
! [X2,X0,X1] : double_divide(double_divide(identity,double_divide(X0,double_divide(X1,identity))),double_divide(double_divide(X1,double_divide(X2,X0)),identity)) = X2,
inference(forward_demodulation,[],[f36,f10]) ).
fof(f38,plain,
identity = double_divide(sF7,sF8),
inference(superposition,[],[f32,f28]) ).
fof(f39,plain,
identity = double_divide(a2,sF7),
inference(superposition,[],[f32,f26]) ).
fof(f40,plain,
! [X0,X1] : double_divide(double_divide(identity,double_divide(X0,sF8)),double_divide(double_divide(sF7,double_divide(X1,X0)),identity)) = X1,
inference(superposition,[],[f37,f28]) ).
fof(f42,plain,
! [X0,X1] : double_divide(double_divide(identity,identity),double_divide(double_divide(X0,double_divide(X1,X0)),identity)) = X1,
inference(superposition,[],[f37,f32]) ).
fof(f50,plain,
! [X0] : double_divide(double_divide(identity,double_divide(identity,double_divide(X0,identity))),double_divide(identity,identity)) = X0,
inference(superposition,[],[f37,f32]) ).
fof(f52,plain,
identity = double_divide(identity,identity),
inference(superposition,[],[f37,f32]) ).
fof(f57,plain,
! [X0,X1] : double_divide(identity,double_divide(double_divide(X0,double_divide(X1,X0)),identity)) = X1,
inference(forward_demodulation,[],[f42,f52]) ).
fof(f64,plain,
a2 = double_divide(identity,double_divide(double_divide(sF7,identity),identity)),
inference(superposition,[],[f57,f39]) ).
fof(f65,plain,
sF7 = double_divide(identity,double_divide(double_divide(sF8,identity),identity)),
inference(superposition,[],[f57,f38]) ).
fof(f72,plain,
a2 = double_divide(identity,double_divide(sF8,identity)),
inference(forward_demodulation,[],[f64,f28]) ).
fof(f77,plain,
sF8 = double_divide(identity,double_divide(a2,identity)),
inference(superposition,[],[f57,f72]) ).
fof(f80,plain,
sF8 = double_divide(identity,sF7),
inference(forward_demodulation,[],[f77,f26]) ).
fof(f98,plain,
double_divide(identity,double_divide(sF7,identity)) = double_divide(sF8,identity),
inference(superposition,[],[f57,f65]) ).
fof(f101,plain,
double_divide(identity,sF8) = double_divide(sF8,identity),
inference(forward_demodulation,[],[f98,f28]) ).
fof(f107,plain,
a2 = double_divide(identity,double_divide(identity,sF8)),
inference(superposition,[],[f72,f101]) ).
fof(f112,plain,
! [X0] : double_divide(double_divide(identity,double_divide(identity,double_divide(X0,identity))),identity) = X0,
inference(forward_demodulation,[],[f50,f52]) ).
fof(f128,plain,
a2 = double_divide(double_divide(identity,double_divide(identity,sF7)),identity),
inference(superposition,[],[f112,f26]) ).
fof(f147,plain,
a2 = double_divide(double_divide(identity,sF8),identity),
inference(forward_demodulation,[],[f128,f80]) ).
fof(f318,plain,
identity = double_divide(double_divide(identity,double_divide(identity,sF8)),double_divide(double_divide(sF7,identity),identity)),
inference(superposition,[],[f40,f52]) ).
fof(f367,plain,
identity = double_divide(double_divide(identity,double_divide(identity,sF8)),double_divide(sF8,identity)),
inference(forward_demodulation,[],[f318,f28]) ).
fof(f381,plain,
identity = double_divide(double_divide(identity,double_divide(identity,sF8)),double_divide(identity,sF8)),
inference(forward_demodulation,[],[f367,f101]) ).
fof(f387,plain,
identity = double_divide(a2,double_divide(identity,sF8)),
inference(forward_demodulation,[],[f381,f107]) ).
fof(f392,plain,
a2 = double_divide(identity,double_divide(double_divide(double_divide(identity,sF8),identity),identity)),
inference(superposition,[],[f57,f387]) ).
fof(f394,plain,
a2 = double_divide(identity,double_divide(a2,identity)),
inference(forward_demodulation,[],[f392,f147]) ).
fof(f398,plain,
a2 = double_divide(identity,sF7),
inference(forward_demodulation,[],[f394,f26]) ).
fof(f402,plain,
a2 = sF8,
inference(forward_demodulation,[],[f398,f80]) ).
fof(f404,plain,
a2 != a2,
inference(superposition,[],[f29,f402]) ).
fof(f415,plain,
$false,
inference(trivial_inequality_removal,[],[f404]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.01 % Problem : GRP497-1 : TPTP v9.3.1. Released v2.6.0.
% 0.00/0.03 % Command : run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% 0.04/15.33 % Computer : n012.cluster.edu
% 0.04/15.33 % Model : x86_64 x86_64
% 0.04/15.33 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.04/15.33 % Memory : 8046.5625MB
% 0.04/15.33 % OS : Linux 6.8.0-71-generic
% 0.04/15.33 % CPULimit : 300
% 0.04/15.33 % WCLimit : 300
% 0.04/15.33 % DateTime : Sun Sep 27 10:05:51 UTC 2026
% 0.04/15.33 % CPUTime :
% 0.04/15.33 Running run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% 0.04/15.35 Running first-order theorem proving
% 0.04/15.35 Running: /export/starexec/sandbox/solver/bin/vampire --input_syntax tptp --output_axiom_names on --mode casc -m 16384 --cores 7 -t 300 /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.08/15.95 % (2141472)Detected a unit-equality problem, will run specialized UEQ schedule.
% 0.08/15.95 % (2141481)dis+10_14_to=lpo:sil=8000:tgt=full:drc=off:sp=const_frequency:sos=all:random_seed=3358639271:i=181:gtgl=5:bs=unit_only:fsr=off:gtg=exists_all_2999 on theBenchmark for (2999ds/181Mi)
% 0.08/15.95 % (2141477)lrs+1002_1_ncem=casc2026/models/loop7.pt:sil=128000:tgt=ground:npcc=on:drc=off:sp=reverse_frequency:spb=goal:acc=on:s2agt=16:kmz=on:sac=on:random_seed=1806356394:i=138329:kws=inv_arity_squared:fgj=on:bd=preordered_2999 on theBenchmark for (2999ds/138329Mi)
% 0.08/15.95 % (2141479)lrs+10_1_ncem=casc2026/models/loop5.pt:sil=128000:tgt=ground:npcc=on:spb=goal_then_units:urr=ec_only:random_seed=2533353329:i=130716:gtgl=4:add=on:doe=on:bd=all:gtg=exists_sym_2999 on theBenchmark for (2999ds/130716Mi)
% 0.08/15.95 % (2141478)lrs+11_1_ncem=casc2026/models/loop6.pt:sil=128000:npcc=on:lma=off:spb=units:urr=ec_only:bce=on:s2agt=64:updr=off:random_seed=3528386194:i=130792:sd=20:aac=none:nm=16:ss=included:sgt=10_2999 on theBenchmark for (2999ds/130792Mi)
% 0.08/15.95 % (2141482)lrs+10_3_to=lpo:sil=64000:drc=off:fde=unused:sp=reverse_frequency:acc=on:bsr=on:fd=preordered:nwc=1:random_seed=4227946466:avsq=on:i=257:avsqr=16,3:bd=preordered:fsr=off_2999 on theBenchmark for (2999ds/257Mi)
% 0.08/15.95 % (2141483)dis-1010_7_sil=8000:fde=unused:flr=on:random_seed=580139040:i=1187:sd=4:av=off:ss=axioms:sgt=32_2999 on theBenchmark for (2999ds/1187Mi)
% 0.08/15.95 % (2141480)ott-1010_1_sfv=off:to=lpo:sil=8000:fdtod=off:sp=reverse_frequency:spb=goal_then_units:fd=preordered:random_seed=1020801389:i=136:bd=preordered:ins=2:av=off_2999 on theBenchmark for (2999ds/136Mi)
% 0.08/15.95 % (2141481)First to succeed.
% 0.08/15.95 % (2141481)Solution written to "/export/starexec/sandbox/tmp/vampire-proof-2141472"
% 0.08/15.95 % (2141480)Also succeeded, but the first one will report.
% 0.08/15.95 % (2141483)Also succeeded, but the first one will report.
% 0.08/15.95 % (2141482)Also succeeded, but the first one will report.
% 0.08/15.95 % (2141481)Refutation found. Thanks to Tanya!
% 0.08/15.95 % SZS status Unsatisfiable for theBenchmark
% 0.08/15.95 % SZS output start Proof for theBenchmark
% See solution above
% 0.08/15.95 % (2141481)------------------------------
% 0.08/15.95 % (2141481)Version: Vampire 5.0.1 (Release build, commit ea8961452 on 2026-07-16 15:14:34 +0200)
% 0.08/15.95 % (2141481)Linked with Z3 4.14.0.0 3c47fd96cf5645d0c42b2c819d9e9a84380aa721 z3-4.8.4-9178-g3c47fd96c
% 0.08/15.95 % (2141481)CaDiCaL version: 2.1.3
% 0.08/15.95 % (2141481)Termination reason: Refutation
% 0.08/15.95 % (2141481)Time elapsed: 0.006 s
% 0.08/15.95 % (2141481)Peak memory usage: 88 MB
% 0.08/15.95 % (2141481)Instructions burned: 16 (million)
% 0.08/15.95 % (2141481)------------------------------
% 0.08/15.95 % (2141481)------------------------------
% 0.08/15.95 % (2141472)Success in time 0.301 s
% 0.08/15.95 % Vampire exiting
%------------------------------------------------------------------------------