%------------------------------------------------------------------------------
% File : Vampire---5.0.1
% Problem : COL058-1 : TPTP v9.3.1. Released v1.0.0.
% Transfm : none
% Format : tptp:raw
% Command : run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% Computer : n018.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 09:37:46 AM UTC 2026
% Result : Unsatisfiable 4.48s 1.81s
% Output : Refutation 4.48s
% Verified :
% SZS Type : Refutation
% Derivation depth : 4
% Number of leaves : 2
% Syntax : Number of formulae : 6 ( 6 unt; 0 def)
% Number of atoms : 6 ( 5 equ)
% Maximal formula atoms : 1 ( 1 avg)
% Number of connectives : 4 ( 4 ~; 0 |; 0 &)
% ( 0 <=>; 0 =>; 0 <=; 0 <~>)
% Maximal formula depth : 3 ( 3 avg)
% Maximal term depth : 5 ( 2 avg)
% Number of predicates : 2 ( 0 usr; 1 prp; 0-2 aty)
% Number of functors : 2 ( 2 usr; 1 con; 0-2 aty)
% Number of variables : 6 ( 6 !; 0 ?)
% Comments :
%------------------------------------------------------------------------------
fof(f1,axiom,
! [X0,X1] : response(response(lark,X0),X1) = response(X0,response(X1,X1)),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',lark_exists) ).
fof(f2,negated_conjecture,
! [X0] : response(X0,X0) != X0,
file('/export/starexec/sandbox/benchmark/theBenchmark.p',prove_the_bird_exists) ).
fof(f5,plain,
! [X0] : response(X0,X0) != response(response(lark,response(X0,X0)),X0),
inference(superposition,[],[f2,f1]) ).
fof(f7,plain,
! [X0] : response(X0,X0) != response(response(response(lark,lark),X0),X0),
inference(superposition,[],[f5,f1]) ).
fof(f12,plain,
! [X0] : response(response(X0,X0),response(X0,X0)) != response(response(response(lark,response(lark,lark)),X0),response(X0,X0)),
inference(superposition,[],[f7,f1]) ).
fof(f28,plain,
$false,
inference(equality_resolution,[],[f12]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.05 % Problem : COL058-1 : TPTP v9.3.1. Released v1.0.0.
% 0.00/0.10 % Command : run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% 0.28/0.31 % Computer : n018.cluster.edu
% 0.28/0.31 % Model : x86_64 x86_64
% 0.28/0.31 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.28/0.31 % Memory : 8046.5625MB
% 0.28/0.31 % OS : Linux 6.8.0-71-generic
% 0.28/0.31 % CPULimit : 300
% 0.28/0.31 % WCLimit : 300
% 0.28/0.31 % DateTime : Mon Sep 28 21:33:40 UTC 2026
% 0.28/0.31 % CPUTime :
% 0.28/0.31 Running run_vampire /export/starexec/sandbox/benchmark/theBenchmark.p 300 THM
% 0.28/0.37 Running first-order theorem proving
% 0.28/0.37 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
% 4.48/1.81 % (3811879)Detected a unit-equality problem, will run specialized UEQ schedule.
% 4.48/1.81 % (3811890)dis-1010_7_sil=8000:fde=unused:flr=on:random_seed=2162572973:i=1187:sd=4:av=off:ss=axioms:sgt=32_2999 on theBenchmark for (2999ds/1187Mi)
% 4.48/1.81 % (3811890)First to succeed.
% 4.48/1.81 % (3811890)Solution written to "/export/starexec/sandbox/tmp/vampire-proof-3811879"
% 4.48/1.81 % (3811886)lrs+10_1_ncem=casc2026/models/loop5.pt:sil=128000:tgt=ground:npcc=on:spb=goal_then_units:urr=ec_only:random_seed=1035110666:i=130716:gtgl=4:add=on:doe=on:bd=all:gtg=exists_sym_2999 on theBenchmark for (2999ds/130716Mi)
% 4.48/1.81 % (3811884)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=1152719050:i=138329:kws=inv_arity_squared:fgj=on:bd=preordered_2999 on theBenchmark for (2999ds/138329Mi)
% 4.48/1.81 % (3811885)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=1412630172:i=130792:sd=20:aac=none:nm=16:ss=included:sgt=10_2999 on theBenchmark for (2999ds/130792Mi)
% 4.48/1.81 % (3811887)ott-1010_1_sfv=off:to=lpo:sil=8000:fdtod=off:sp=reverse_frequency:spb=goal_then_units:fd=preordered:random_seed=785867796:i=136:bd=preordered:ins=2:av=off_2999 on theBenchmark for (2999ds/136Mi)
% 4.48/1.81 % (3811888)dis+10_14_to=lpo:sil=8000:tgt=full:drc=off:sp=const_frequency:sos=all:random_seed=2021599007:i=181:gtgl=5:bs=unit_only:fsr=off:gtg=exists_all_2999 on theBenchmark for (2999ds/181Mi)
% 4.48/1.81 % (3811889)lrs+10_3_to=lpo:sil=64000:drc=off:fde=unused:sp=reverse_frequency:acc=on:bsr=on:fd=preordered:nwc=1:random_seed=3036023438:avsq=on:i=257:avsqr=16,3:bd=preordered:fsr=off_2999 on theBenchmark for (2999ds/257Mi)
% 4.48/1.81 % (3811888)Also succeeded, but the first one will report.
% 4.48/1.81 % (3811887)Also succeeded, but the first one will report.
% 4.48/1.81 % (3811889)Also succeeded, but the first one will report.
% 4.48/1.81 % (3811890)Refutation found. Thanks to Tanya!
% 4.48/1.81 % SZS status Unsatisfiable for theBenchmark
% 4.48/1.81 % SZS output start Proof for theBenchmark
% See solution above
% 4.48/1.81 % (3811890)------------------------------
% 4.48/1.81 % (3811890)Version: Vampire 5.0.1 (Release build, commit ea8961452 on 2026-07-16 15:14:34 +0200)
% 4.48/1.81 % (3811890)Linked with Z3 4.14.0.0 3c47fd96cf5645d0c42b2c819d9e9a84380aa721 z3-4.8.4-9178-g3c47fd96c
% 4.48/1.81 % (3811890)CaDiCaL version: 2.1.3
% 4.48/1.81 % (3811890)Termination reason: Refutation
% 4.48/1.81 % (3811890)Time elapsed: 0.002 s
% 4.48/1.81 % (3811890)Peak memory usage: 87 MB
% 4.48/1.81 % (3811890)Instructions burned: 2 (million)
% 4.48/1.81 % (3811890)------------------------------
% 4.48/1.81 % (3811890)------------------------------
% 4.48/1.81 % (3811879)Success in time 0.474 s
% 4.48/1.81 % Vampire exiting
%------------------------------------------------------------------------------