%------------------------------------------------------------------------------
% File : Vampire---5.0.1
% Problem : GRP517-1 : 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 : 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 : Tue Sep 29 10:14:46 AM UTC 2026
% Result : Unsatisfiable 2.48s 1.04s
% Output : Refutation 2.48s
% Verified :
% SZS Type : Refutation
% Derivation depth : 13
% Number of leaves : 2
% Syntax : Number of formulae : 18 ( 18 unt; 0 def)
% Number of atoms : 18 ( 17 equ)
% Maximal formula atoms : 1 ( 1 avg)
% Number of connectives : 4 ( 4 ~; 0 |; 0 &)
% ( 0 <=>; 0 =>; 0 <=; 0 <~>)
% Maximal formula depth : 5 ( 3 avg)
% Maximal term depth : 7 ( 2 avg)
% Number of predicates : 2 ( 0 usr; 1 prp; 0-2 aty)
% Number of functors : 4 ( 4 usr; 2 con; 0-2 aty)
% Number of variables : 32 ( 32 !; 0 ?)
% Comments :
%------------------------------------------------------------------------------
fof(f1,axiom,
! [X2,X0,X1] : multiply(X0,multiply(multiply(inverse(multiply(X0,X1)),X2),X1)) = X2,
file('/export/starexec/sandbox/benchmark/theBenchmark.p',single_axiom) ).
fof(f2,negated_conjecture,
multiply(inverse(a1),a1) != multiply(inverse(b1),b1),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',prove_these_axioms_1) ).
fof(f3,plain,
! [X2,X3,X0,X1] : multiply(X1,multiply(multiply(inverse(X0),X3),multiply(multiply(inverse(multiply(X1,X2)),X0),X2))) = X3,
inference(superposition,[],[f1,f1]) ).
fof(f11,plain,
! [X0,X1] : multiply(multiply(inverse(X0),X1),X0) = X1,
inference(superposition,[],[f3,f1]) ).
fof(f14,plain,
! [X2,X0,X1] : multiply(X0,X1) = multiply(multiply(inverse(multiply(inverse(X1),X2)),X0),X2),
inference(superposition,[],[f11,f1]) ).
fof(f23,plain,
! [X0,X1] : multiply(inverse(X1),multiply(X0,X1)) = X0,
inference(superposition,[],[f1,f14]) ).
fof(f32,plain,
! [X0,X1] : inverse(X1) = multiply(inverse(multiply(X0,X1)),X0),
inference(superposition,[],[f23,f23]) ).
fof(f53,plain,
! [X0,X1] : multiply(X1,multiply(inverse(X0),X0)) = X1,
inference(superposition,[],[f1,f32]) ).
fof(f54,plain,
! [X0,X1] : multiply(inverse(X1),X1) = multiply(inverse(X0),X0),
inference(superposition,[],[f14,f32]) ).
fof(f74,plain,
! [X2,X0,X1] : multiply(X0,multiply(inverse(multiply(X0,multiply(inverse(X1),X1))),X2)) = X2,
inference(superposition,[],[f1,f53]) ).
fof(f78,plain,
! [X2,X0] : multiply(X0,multiply(inverse(X0),X2)) = X2,
inference(forward_demodulation,[],[f74,f53]) ).
fof(f86,plain,
! [X0,X1] : multiply(X0,X1) = multiply(X1,X0),
inference(superposition,[],[f78,f23]) ).
fof(f147,plain,
multiply(inverse(a1),a1) != multiply(b1,inverse(b1)),
inference(superposition,[],[f2,f86]) ).
fof(f163,plain,
multiply(b1,inverse(b1)) != multiply(a1,inverse(a1)),
inference(forward_demodulation,[],[f147,f86]) ).
fof(f828,plain,
! [X0,X1] : multiply(inverse(X1),X1) = multiply(X0,inverse(X0)),
inference(forward_demodulation,[],[f54,f86]) ).
fof(f829,plain,
! [X0,X1] : multiply(X0,inverse(X0)) = multiply(X1,inverse(X1)),
inference(forward_demodulation,[],[f828,f86]) ).
fof(f883,plain,
! [X0] : multiply(X0,inverse(X0)) != multiply(a1,inverse(a1)),
inference(superposition,[],[f163,f829]) ).
fof(f884,plain,
$false,
inference(forward_subsumption_resolution,[],[f883,f829]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : GRP517-1 : TPTP v9.3.1. Released v2.6.0.
% 0.00/0.06 % Command : run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% 0.12/0.38 % Computer : n013.cluster.edu
% 0.12/0.38 % Model : x86_64 x86_64
% 0.12/0.38 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.38 % Memory : 8046.5625MB
% 0.12/0.38 % OS : Linux 6.8.0-71-generic
% 0.12/0.38 % CPULimit : 300
% 0.12/0.38 % WCLimit : 300
% 0.12/0.38 % DateTime : Sun Sep 27 10:05:51 UTC 2026
% 0.12/0.38 % CPUTime :
% 0.12/0.38 Running run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% 0.12/0.41 Running first-order theorem proving
% 0.12/0.41 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
% 2.48/1.04 % (4176334)Detected a unit-equality problem, will run specialized UEQ schedule.
% 2.48/1.04 % (4176423)dis-1010_7_sil=8000:fde=unused:flr=on:random_seed=1745915449:i=1187:sd=4:av=off:ss=axioms:sgt=32_2999 on theBenchmark for (2999ds/1187Mi)
% 2.48/1.04 % (4176423)First to succeed.
% 2.48/1.04 % (4176423)Solution written to "/export/starexec/sandbox/tmp/vampire-proof-4176334"
% 2.48/1.04 % (4176421)lrs+10_3_to=lpo:sil=64000:drc=off:fde=unused:sp=reverse_frequency:acc=on:bsr=on:fd=preordered:nwc=1:random_seed=1224060606:avsq=on:i=257:avsqr=16,3:bd=preordered:fsr=off_2999 on theBenchmark for (2999ds/257Mi)
% 2.48/1.04 % (4176415)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=1572289656:i=138329:kws=inv_arity_squared:fgj=on:bd=preordered_2999 on theBenchmark for (2999ds/138329Mi)
% 2.48/1.04 % (4176418)lrs+10_1_ncem=casc2026/models/loop5.pt:sil=128000:tgt=ground:npcc=on:spb=goal_then_units:urr=ec_only:random_seed=815193368:i=130716:gtgl=4:add=on:doe=on:bd=all:gtg=exists_sym_2999 on theBenchmark for (2999ds/130716Mi)
% 2.48/1.04 % (4176419)ott-1010_1_sfv=off:to=lpo:sil=8000:fdtod=off:sp=reverse_frequency:spb=goal_then_units:fd=preordered:random_seed=4147355802:i=136:bd=preordered:ins=2:av=off_2999 on theBenchmark for (2999ds/136Mi)
% 2.48/1.04 % (4176420)dis+10_14_to=lpo:sil=8000:tgt=full:drc=off:sp=const_frequency:sos=all:random_seed=2792801833:i=181:gtgl=5:bs=unit_only:fsr=off:gtg=exists_all_2999 on theBenchmark for (2999ds/181Mi)
% 2.48/1.04 % (4176421)Also succeeded, but the first one will report.
% 2.48/1.04 % (4176420)Also succeeded, but the first one will report.
% 2.48/1.04 % (4176416)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=1350746409:i=130792:sd=20:aac=none:nm=16:ss=included:sgt=10_2999 on theBenchmark for (2999ds/130792Mi)
% 2.48/1.04 % (4176419)Instruction limit reached!
% 2.48/1.04 % (4176419)------------------------------
% 2.48/1.04 % (4176419)Version: Vampire 5.0.1 (Release build, commit ea8961452 on 2026-07-16 15:14:34 +0200)
% 2.48/1.04 % (4176419)Linked with Z3 4.14.0.0 3c47fd96cf5645d0c42b2c819d9e9a84380aa721 z3-4.8.4-9178-g3c47fd96c
% 2.48/1.04 % (4176419)CaDiCaL version: 2.1.3
% 2.48/1.04 % (4176419)Termination reason: Instruction limit
% 2.48/1.04 % (4176419)Termination phase: Saturation
% 2.48/1.04 % (4176419)Time elapsed: 0.084 s
% 2.48/1.04 % (4176419)Peak memory usage: 88 MB
% 2.48/1.04 % (4176419)Instructions burned: 136 (million)
% 2.48/1.04 % (4176423)Refutation found. Thanks to Tanya!
% 2.48/1.04 % SZS status Unsatisfiable for theBenchmark
% 2.48/1.04 % SZS output start Proof for theBenchmark
% See solution above
% 2.48/1.04 % (4176423)------------------------------
% 2.48/1.04 % (4176423)Version: Vampire 5.0.1 (Release build, commit ea8961452 on 2026-07-16 15:14:34 +0200)
% 2.48/1.04 % (4176423)Linked with Z3 4.14.0.0 3c47fd96cf5645d0c42b2c819d9e9a84380aa721 z3-4.8.4-9178-g3c47fd96c
% 2.48/1.04 % (4176423)CaDiCaL version: 2.1.3
% 2.48/1.04 % (4176423)Termination reason: Refutation
% 2.48/1.04 % (4176423)Time elapsed: 0.011 s
% 2.48/1.04 % (4176423)Peak memory usage: 88 MB
% 2.48/1.04 % (4176423)Instructions burned: 33 (million)
% 2.48/1.04 % (4176423)------------------------------
% 2.48/1.04 % (4176423)------------------------------
% 2.48/1.04 % (4176334)Success in time 0.304 s
% 2.48/1.04 % Vampire exiting
%------------------------------------------------------------------------------