%------------------------------------------------------------------------------
% File : Leo-III---1.8.0
% Problem : SYN966+1 : TPTP v9.3.1. Released v3.1.0.
% Transfm : none
% Format : tptp:raw
% Command : java -Xss128m -Xmx2g -Xms1g -jar /export/starexec/sandbox/solver/bin/leo3.jar /export/starexec/sandbox/benchmark/theBenchmark.p -t 300 -p --atp eprover=/export/starexec/sandbox/solver/bin/externals/eprover --instantiate 39
% 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 : Sun Sep 27 09:20:30 AM UTC 2026
% Result : Theorem 1.59s 6.26s
% Output : Refutation 1.59s
% Verified :
% SZS Type : Refutation
% Derivation depth : 3
% Number of leaves : 1
% Syntax : Number of formulae : 4 ( 1 unt; 0 typ; 0 def)
% Number of atoms : 23 ( 0 equ; 0 cnn)
% Maximal formula atoms : 12 ( 5 avg)
% Number of connectives : 65 ( 2 ~; 0 |; 3 &; 44 @)
% ( 4 <=>; 12 =>; 0 <=; 0 <~>)
% Maximal formula depth : 12 ( 8 avg)
% Number of types : 2 ( 0 usr)
% Number of type conns : 0 ( 0 >; 0 *; 0 +; 0 <<)
% Number of symbols : 3 ( 2 usr; 1 con; 0-2 aty)
% Number of variables : 16 ( 0 ^; 16 !; 0 ?; 16 :)
% Comments :
%------------------------------------------------------------------------------
thf(eq_decl,type,
eq: $i > $i > $o ).
thf(a_member_of_decl,type,
a_member_of: $i > $i > $o ).
thf(1,conjecture,
( ! [A: $i,B: $i] :
( ( B @ ( A @ eq ) )
<=> ! [C: $i] :
( ( A @ ( C @ a_member_of ) )
<=> ( B @ ( C @ a_member_of ) ) ) )
=> ! [A: $i,B: $i] :
( ( B @ ( A @ eq ) )
=> ( A @ ( B @ eq ) ) ) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',prove_this) ).
thf(2,negated_conjecture,
~ ( ! [A: $i,B: $i] :
( ( B @ ( A @ eq ) )
<=> ! [C: $i] :
( ( A @ ( C @ a_member_of ) )
<=> ( B @ ( C @ a_member_of ) ) ) )
=> ! [A: $i,B: $i] :
( ( B @ ( A @ eq ) )
=> ( A @ ( B @ eq ) ) ) ),
inference(neg_conjecture,[status(cth)],[1]) ).
thf(3,plain,
~ ( ! [A: $i,B: $i] :
( ( ! [C: $i] :
( ( ( B @ ( C @ a_member_of ) )
=> ( A @ ( C @ a_member_of ) ) )
& ( ( A @ ( C @ a_member_of ) )
=> ( B @ ( C @ a_member_of ) ) ) )
=> ( B @ ( A @ eq ) ) )
& ( ( B @ ( A @ eq ) )
=> ! [C: $i] :
( ( ( B @ ( C @ a_member_of ) )
=> ( A @ ( C @ a_member_of ) ) )
& ( ( A @ ( C @ a_member_of ) )
=> ( B @ ( C @ a_member_of ) ) ) ) ) )
=> ! [A: $i,B: $i] :
( ( B @ ( A @ eq ) )
=> ( A @ ( B @ eq ) ) ) ),
inference(defexp_and_simp_and_etaexpand,[status(thm)],[2]) ).
thf(23,plain,
$false,
inference(e,[status(thm)],[3]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.01 % Problem : SYN966+1 : TPTP v9.3.1. Released v3.1.0.
% 0.00/0.04 % Command : java -Xss128m -Xmx2g -Xms1g -jar /export/starexec/sandbox/solver/bin/leo3.jar /export/starexec/sandbox/benchmark/theBenchmark.p -t 300 -p --atp eprover=/export/starexec/sandbox/solver/bin/externals/eprover --instantiate 39
% 0.05/5.32 % Computer : n012.cluster.edu
% 0.05/5.32 % Model : x86_64 x86_64
% 0.05/5.32 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.05/5.32 % Memory : 8046.5625MB
% 0.05/5.32 % OS : Linux 6.8.0-71-generic
% 0.05/5.32 % CPULimit : 300
% 0.05/5.32 % WCLimit : 300
% 0.05/5.32 % DateTime : Sat Sep 26 18:51:55 UTC 2026
% 0.05/5.32 % CPUTime :
% 0.05/5.32 Running java -Xss128m -Xmx2g -Xms1g -jar /export/starexec/sandbox/solver/bin/leo3.jar /export/starexec/sandbox/benchmark/theBenchmark.p -t 300 -p --atp eprover=/export/starexec/sandbox/solver/bin/externals/eprover --instantiate 39
% 0.08/5.60 % [INFO] Parsing problem /export/starexec/sandbox/benchmark/theBenchmark.p ...
% 0.08/5.69 % [INFO] Parsing done (81ms).
% 0.08/5.69 % [INFO] Running in sequential loop mode.
% 0.08/5.88 % [INFO] eprover registered as external prover.
% 0.08/5.88 % [INFO] Scanning for conjecture ...
% 0.08/5.92 % [INFO] Found a conjecture (or negated_conjecture) and 0 axioms. Running axiom selection ...
% 0.08/5.94 % [INFO] Axiom selection finished. Selected 0 axioms (removed 0 axioms).
% 0.08/5.94 % [INFO] Problem is first-order (TPTP FOF).
% 0.08/5.94 % [INFO] Type checking passed.
% 0.08/5.95 % [CONFIG] Using configuration: timeout(300) with strategy<name(default),share(1.0),primSubst(3),sos(false),unifierCount(4),uniDepth(8),boolExt(true),choice(true),renaming(true),funcspec(false), domConstr(0),specialInstances(39),restrictUniAttempts(true),termOrdering(CPO)>. Searching for refutation ...
% 1.59/6.26 % External prover 'e' found a proof!
% 1.59/6.26 % [INFO] Killing All external provers ...
% 1.59/6.26 % Time passed: 859ms (effective reasoning time: 561ms)
% 1.59/6.26 % Solved by strategy<name(default),share(1.0),primSubst(3),sos(false),unifierCount(4),uniDepth(8),boolExt(true),choice(true),renaming(true),funcspec(false), domConstr(0),specialInstances(39),restrictUniAttempts(true),termOrdering(CPO)>
% 1.59/6.26 % Axioms used in derivation (0):
% 1.59/6.26 % No. of inferences in proof: 4
% 1.59/6.26 % SZS status Theorem for /export/starexec/sandbox/benchmark/theBenchmark.p : 859 ms resp. 561 ms w/o parsing
% 1.59/6.27 % SZS output start Refutation for /export/starexec/sandbox/benchmark/theBenchmark.p
% See solution above
% 1.59/6.27 % [INFO] Killing All external provers ...
%------------------------------------------------------------------------------