%------------------------------------------------------------------------------
% File : Leo-III---1.8.0
% Problem : SEU611^2 : TPTP v9.3.1. Released v3.7.0.
% 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 : n019.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 : Wed Sep 30 08:28:45 AM UTC 2026
% Result : Theorem 3.60s 2.25s
% Output : Refutation 3.60s
% Verified :
% SZS Type : Refutation
% Derivation depth : 3
% Number of leaves : 5
% Syntax : Number of formulae : 8 ( 5 unt; 0 typ; 4 def)
% Number of atoms : 45 ( 4 equ; 0 cnn)
% Maximal formula atoms : 13 ( 5 avg)
% Number of connectives : 140 ( 12 ~; 4 |; 0 &; 88 @)
% ( 0 <=>; 36 =>; 0 <=; 0 <~>)
% Maximal formula depth : 16 ( 7 avg)
% Number of types : 2 ( 0 usr)
% Number of type conns : 4 ( 4 >; 0 *; 0 +; 0 <<)
% Number of symbols : 9 ( 7 usr; 4 con; 0-2 aty)
% Number of variables : 34 ( 4 ^; 30 !; 0 ?; 34 :)
% Comments :
%------------------------------------------------------------------------------
thf(in_decl,type,
in: $i > $i > $o ).
thf(dsetconstr_decl,type,
dsetconstr: $i > ( $i > $o ) > $i ).
thf(dsetconstrEL_decl,type,
dsetconstrEL: $o ).
thf(dsetconstrER_decl,type,
dsetconstrER: $o ).
thf(binunion_decl,type,
binunion: $i > $i > $i ).
thf(binunionE_decl,type,
binunionE: $o ).
thf(symdiff_decl,type,
symdiff: $i > $i > $i ).
thf(dsetconstrEL_def,definition,
( dsetconstrEL
= ( ! [A: $i,B: $i > $o,C: $i] :
( ( in @ C @ ( dsetconstr @ A @ B ) )
=> ( in @ C @ A ) ) ) ) ).
thf(dsetconstrER_def,definition,
( dsetconstrER
= ( ! [A: $i,B: $i > $o,C: $i] :
( ( in @ C @ ( dsetconstr @ A @ B ) )
=> ( B @ C ) ) ) ) ).
thf(binunionE_def,definition,
( binunionE
= ( ! [A: $i,B: $i,C: $i] :
( ( in @ C @ ( binunion @ A @ B ) )
=> ( ( in @ C @ A )
| ( in @ C @ B ) ) ) ) ) ).
thf(symdiff_def,definition,
( symdiff
= ( ^ [A: $i,B: $i] :
( dsetconstr @ ( binunion @ A @ B )
@ ^ [C: $i] :
( ~ ( in @ C @ A )
| ~ ( in @ C @ B ) ) ) ) ) ).
thf(1,conjecture,
( dsetconstrEL
=> ( dsetconstrER
=> ( binunionE
=> ! [A: $i,B: $i,C: $i] :
( ( in @ C @ ( symdiff @ A @ B ) )
=> ! [D: $o] :
( ( ( in @ C @ A )
=> ( ~ ( in @ C @ B )
=> D ) )
=> ( ( ~ ( in @ C @ A )
=> ( ( in @ C @ B )
=> D ) )
=> D ) ) ) ) ) ),
file('/export/starexec/sandbox/benchmark/theBenchmark.p',symdiffE) ).
thf(2,negated_conjecture,
~ ( dsetconstrEL
=> ( dsetconstrER
=> ( binunionE
=> ! [A: $i,B: $i,C: $i] :
( ( in @ C @ ( symdiff @ A @ B ) )
=> ! [D: $o] :
( ( ( in @ C @ A )
=> ( ~ ( in @ C @ B )
=> D ) )
=> ( ( ~ ( in @ C @ A )
=> ( ( in @ C @ B )
=> D ) )
=> D ) ) ) ) ) ),
inference(neg_conjecture,[status(cth)],[1]) ).
thf(3,plain,
~ ( ! [A: $i,B: $i > $o,C: $i] :
( ( in @ C @ ( dsetconstr @ A @ B ) )
=> ( in @ C @ A ) )
=> ( ! [A: $i,B: $i > $o,C: $i] :
( ( in @ C @ ( dsetconstr @ A @ B ) )
=> ( B @ C ) )
=> ( ! [A: $i,B: $i,C: $i] :
( ( in @ C @ ( binunion @ A @ B ) )
=> ( ( in @ C @ A )
| ( in @ C @ B ) ) )
=> ! [A: $i,B: $i,C: $i] :
( ( in @ C
@ ( dsetconstr @ ( binunion @ A @ B )
@ ^ [D: $i] :
( ~ ( in @ D @ A )
| ~ ( in @ D @ B ) ) ) )
=> ! [D: $o] :
( ( ( in @ C @ A )
=> ( ~ ( in @ C @ B )
=> D ) )
=> ( ( ~ ( in @ C @ A )
=> ( ( in @ C @ B )
=> D ) )
=> D ) ) ) ) ) ),
inference(defexp_and_simp_and_etaexpand,[status(thm)],[2]) ).
thf(14,plain,
$false,
inference(e,[status(thm)],[3]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : SEU611^2 : TPTP v9.3.1. Released v3.7.0.
% 0.00/0.08 % 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
% 0.09/0.23 % Computer : n019.cluster.edu
% 0.09/0.23 % Model : x86_64 x86_64
% 0.09/0.23 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.09/0.23 % Memory : 8046.5625MB
% 0.09/0.23 % OS : Linux 6.8.0-71-generic
% 0.09/0.23 % CPULimit : 300
% 0.09/0.23 % WCLimit : 300
% 0.09/0.23 % DateTime : Tue Sep 29 13:58:12 UTC 2026
% 0.09/0.23 % CPUTime :
% 0.09/0.23 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
% 1.01/0.80 % [INFO] Parsing problem /export/starexec/sandbox/benchmark/theBenchmark.p ...
% 1.18/1.02 % [INFO] Parsing done (211ms).
% 1.44/1.03 % [INFO] Running in sequential loop mode.
% 1.99/1.43 % [INFO] eprover registered as external prover.
% 1.99/1.44 % [INFO] Scanning for conjecture ...
% 2.18/1.56 % [INFO] Found a conjecture (or negated_conjecture) and 0 axioms. Running axiom selection ...
% 2.18/1.59 % [INFO] Axiom selection finished. Selected 0 axioms (removed 0 axioms).
% 2.18/1.60 % [INFO] Problem is higher-order (TPTP THF).
% 2.36/1.60 % [INFO] Type checking passed.
% 2.36/1.60 % [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 ...
% 3.60/2.24 % External prover 'e' found a proof!
% 3.60/2.24 % [INFO] Killing All external provers ...
% 3.60/2.24 % Time passed: 1874ms (effective reasoning time: 1204ms)
% 3.60/2.25 % 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)>
% 3.60/2.25 % Axioms used in derivation (0):
% 3.60/2.25 % No. of inferences in proof: 4
% 3.60/2.25 % SZS status Theorem for /export/starexec/sandbox/benchmark/theBenchmark.p : 1874 ms resp. 1204 ms w/o parsing
% 3.60/2.29 % SZS output start Refutation for /export/starexec/sandbox/benchmark/theBenchmark.p
% See solution above
% 3.60/2.29 % [INFO] Killing All external provers ...
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