%------------------------------------------------------------------------------
% File : Zipperpin---2.1.9999
% Problem : GRP574-1 : TPTP v9.2.0. Released v2.6.0.
% Transfm : none
% Format : tptp:raw
% Command : python3 /export/starexec/sandbox/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox/tmp/tmp.aCB029qs6j true
% Computer : n015.cluster.edu
% Model : x86_64 x86_64
% CPU : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory : 8042.1875MB
% OS : Linux 3.10.0-693.el7.x86_64
% CPULimit : 300s
% WCLimit : 300s
% DateTime : Thu Oct 2 04:36:42 PM UTC 2025
% Result : Unsatisfiable 0.45s 0.72s
% Output : Refutation 0.45s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.04/0.09 % Problem : GRP574-1 : TPTP v9.2.0. Released v2.6.0.
% 0.04/0.10 % Command : python3 /export/starexec/sandbox/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox/tmp/tmp.aCB029qs6j true
% 0.10/0.30 % Computer : n015.cluster.edu
% 0.10/0.30 % Model : x86_64 x86_64
% 0.10/0.30 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.10/0.30 % Memory : 8042.1875MB
% 0.10/0.30 % OS : Linux 3.10.0-693.el7.x86_64
% 0.10/0.30 % CPULimit : 300
% 0.10/0.30 % WCLimit : 300
% 0.10/0.30 % DateTime : Wed Oct 1 14:12:53 EDT 2025
% 0.10/0.30 % CPUTime :
% 0.10/0.30 % Running portfolio for 300 s
% 0.10/0.30 % File : /export/starexec/sandbox/benchmark/theBenchmark.p
% 0.10/0.30 % Number of cores: 8
% 0.10/0.31 % Python version: Python 3.6.8
% 0.10/0.31 % Running in FO mode
% 0.44/0.54 % Total configuration time : 435
% 0.44/0.54 % Estimated wc time : 1092
% 0.44/0.54 % Estimated cpu time (7 cpus) : 156.0
% 0.44/0.65 % /export/starexec/sandbox/solver/bin/fo/fo6_bce.sh running for 75s
% 0.44/0.65 % /export/starexec/sandbox/solver/bin/fo/fo1_av.sh running for 75s
% 0.44/0.66 % /export/starexec/sandbox/solver/bin/fo/fo3_bce.sh running for 75s
% 0.44/0.66 % /export/starexec/sandbox/solver/bin/fo/fo13.sh running for 50s
% 0.44/0.66 % /export/starexec/sandbox/solver/bin/fo/fo7.sh running for 63s
% 0.44/0.66 % /export/starexec/sandbox/solver/bin/fo/fo5.sh running for 50s
% 0.44/0.66 % /export/starexec/sandbox/solver/bin/fo/fo4.sh running for 50s
% 0.45/0.72 % Solved by fo/fo3_bce.sh.
% 0.45/0.72 % BCE start: 5
% 0.45/0.72 % BCE eliminated: 0
% 0.45/0.72 % PE start: 5
% 0.45/0.72 logic: eq
% 0.45/0.72 % PE eliminated: 0
% 0.45/0.72 % done 37 iterations in 0.028s
% 0.45/0.72 % SZS status Theorem for '/export/starexec/sandbox/benchmark/theBenchmark.p'
% 0.45/0.72 % SZS output start Refutation
% 0.45/0.72 thf(identity_type, type, identity: $i).
% 0.45/0.72 thf(multiply_type, type, multiply: $i > $i > $i).
% 0.45/0.72 thf(a2_type, type, a2: $i).
% 0.45/0.72 thf(double_divide_type, type, double_divide: $i > $i > $i).
% 0.45/0.72 thf(inverse_type, type, inverse: $i > $i).
% 0.45/0.72 thf(prove_these_axioms_2, conjecture,
% 0.45/0.72 (( multiply @ identity @ a2 ) = ( a2 ))).
% 0.45/0.72 thf(zf_stmt_0, negated_conjecture, (( multiply @ identity @ a2 ) != ( a2 )),
% 0.45/0.72 inference('cnf.neg', [status(esa)], [prove_these_axioms_2])).
% 0.45/0.72 thf(zip_derived_cl4, plain, (((multiply @ identity @ a2) != (a2))),
% 0.45/0.72 inference('cnf', [status(esa)], [zf_stmt_0])).
% 0.45/0.72 thf(multiply, axiom,
% 0.45/0.72 (( multiply @ A @ B ) =
% 0.45/0.72 ( double_divide @ ( double_divide @ B @ A ) @ identity ))).
% 0.45/0.72 thf(zip_derived_cl1, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((multiply @ X1 @ X0)
% 0.45/0.72 = (double_divide @ (double_divide @ X0 @ X1) @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [multiply])).
% 0.45/0.72 thf(inverse, axiom, (( inverse @ A ) = ( double_divide @ A @ identity ))).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl5, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((multiply @ X1 @ X0) = (inverse @ (double_divide @ X0 @ X1)))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl1, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl6, plain, (((inverse @ (inverse @ a2)) != (a2))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl4, zip_derived_cl5, zip_derived_cl2])).
% 0.45/0.72 thf(identity, axiom,
% 0.45/0.72 (( identity ) = ( double_divide @ A @ ( inverse @ A ) ))).
% 0.45/0.72 thf(zip_derived_cl3, plain,
% 0.45/0.72 (![X0 : $i]: ((identity) = (double_divide @ X0 @ (inverse @ X0)))),
% 0.45/0.72 inference('cnf', [status(esa)], [identity])).
% 0.45/0.72 thf(zip_derived_cl3, plain,
% 0.45/0.72 (![X0 : $i]: ((identity) = (double_divide @ X0 @ (inverse @ X0)))),
% 0.45/0.72 inference('cnf', [status(esa)], [identity])).
% 0.45/0.72 thf(zip_derived_cl3, plain,
% 0.45/0.72 (![X0 : $i]: ((identity) = (double_divide @ X0 @ (inverse @ X0)))),
% 0.45/0.72 inference('cnf', [status(esa)], [identity])).
% 0.45/0.72 thf(zip_derived_cl3, plain,
% 0.45/0.72 (![X0 : $i]: ((identity) = (double_divide @ X0 @ (inverse @ X0)))),
% 0.45/0.72 inference('cnf', [status(esa)], [identity])).
% 0.45/0.72 thf(single_axiom, axiom,
% 0.45/0.72 (( double_divide @
% 0.45/0.72 ( double_divide @
% 0.45/0.72 A @
% 0.45/0.72 ( double_divide @
% 0.45/0.72 ( double_divide @ B @ ( double_divide @ C @ A ) ) @
% 0.45/0.72 ( double_divide @ C @ identity ) ) ) @
% 0.45/0.72 ( double_divide @ identity @ identity ) ) =
% 0.45/0.72 ( B ))).
% 0.45/0.72 thf(zip_derived_cl0, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (double_divide @
% 0.45/0.72 (double_divide @ X0 @ (double_divide @ X2 @ X1)) @
% 0.45/0.72 (double_divide @ X2 @ identity))) @
% 0.45/0.72 (double_divide @ identity @ identity)) = (X0))),
% 0.45/0.72 inference('cnf', [status(esa)], [single_axiom])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl7, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (double_divide @
% 0.45/0.72 (double_divide @ X0 @ (double_divide @ X2 @ X1)) @ (inverse @ X2))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl0, zip_derived_cl2, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl10, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ (inverse @ X1) @
% 0.45/0.72 (double_divide @ (double_divide @ X0 @ identity) @ (inverse @ X1))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl7])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl12, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ (inverse @ X1) @
% 0.45/0.72 (double_divide @ (inverse @ X0) @ (inverse @ X1))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl10, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl14, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ (inverse @ (inverse @ X0)) @ identity) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl12])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl15, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((double_divide @ (inverse @ (inverse @ (inverse @ X0))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl14, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl12, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ (inverse @ X1) @
% 0.45/0.72 (double_divide @ (inverse @ X0) @ (inverse @ X1))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl10, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl17, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((double_divide @ (double_divide @ (inverse @ identity) @ X0) @
% 0.45/0.72 (inverse @ identity)) = (inverse @ (inverse @ X0)))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl15, zip_derived_cl12])).
% 0.45/0.72 thf(zip_derived_cl23, plain,
% 0.45/0.72 (((double_divide @ identity @ (inverse @ identity))
% 0.45/0.72 = (inverse @ (inverse @ (inverse @ (inverse @ identity)))))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl17])).
% 0.45/0.72 thf(zip_derived_cl3, plain,
% 0.45/0.72 (![X0 : $i]: ((identity) = (double_divide @ X0 @ (inverse @ X0)))),
% 0.45/0.72 inference('cnf', [status(esa)], [identity])).
% 0.45/0.72 thf(zip_derived_cl24, plain,
% 0.45/0.72 (((identity) = (inverse @ (inverse @ (inverse @ (inverse @ identity)))))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl23, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl7, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (double_divide @
% 0.45/0.72 (double_divide @ X0 @ (double_divide @ X2 @ X1)) @ (inverse @ X2))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl0, zip_derived_cl2, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl28, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (double_divide @
% 0.45/0.72 (double_divide @ X0 @
% 0.45/0.72 (double_divide @ (inverse @ (inverse @ (inverse @ identity))) @
% 0.45/0.72 X1)) @
% 0.45/0.72 identity)) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl24, zip_derived_cl7])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl33, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((double_divide @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (inverse @
% 0.45/0.72 (double_divide @ X0 @
% 0.45/0.72 (double_divide @ (inverse @ (inverse @ (inverse @ identity))) @
% 0.45/0.72 X1)))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl28, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl24, plain,
% 0.45/0.72 (((identity) = (inverse @ (inverse @ (inverse @ (inverse @ identity)))))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl23, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl15, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((double_divide @ (inverse @ (inverse @ (inverse @ X0))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl14, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl32, plain,
% 0.45/0.72 (((double_divide @ identity @ (inverse @ identity))
% 0.45/0.72 = (inverse @ identity))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl24, zip_derived_cl15])).
% 0.45/0.72 thf(zip_derived_cl3, plain,
% 0.45/0.72 (![X0 : $i]: ((identity) = (double_divide @ X0 @ (inverse @ X0)))),
% 0.45/0.72 inference('cnf', [status(esa)], [identity])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl62, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((inverse @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (inverse @ (double_divide @ X0 @ (double_divide @ identity @ X1)))))
% 0.45/0.72 = (X0))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl33, zip_derived_cl36, zip_derived_cl36,
% 0.45/0.72 zip_derived_cl36, zip_derived_cl36, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl17, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((double_divide @ (double_divide @ (inverse @ identity) @ X0) @
% 0.45/0.72 (inverse @ identity)) = (inverse @ (inverse @ X0)))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl15, zip_derived_cl12])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl40, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((inverse @ (double_divide @ identity @ X0))
% 0.45/0.72 = (inverse @ (inverse @ X0)))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl17, zip_derived_cl36, zip_derived_cl36,
% 0.45/0.72 zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl15, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((double_divide @ (inverse @ (inverse @ (inverse @ X0))) @
% 0.45/0.72 (inverse @ identity)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl14, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl39, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ (inverse @ (inverse @ (inverse @ X0)))) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl15, zip_derived_cl36, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl57, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((inverse @ (inverse @ (inverse @ (inverse @ (inverse @ X0)))))
% 0.45/0.72 = (double_divide @ identity @ X0))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl40, zip_derived_cl39])).
% 0.45/0.72 thf(zip_derived_cl39, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ (inverse @ (inverse @ (inverse @ X0)))) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl15, zip_derived_cl36, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl60, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ identity @ X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl57, zip_derived_cl39])).
% 0.45/0.72 thf(zip_derived_cl75, plain,
% 0.45/0.72 (![X0 : $i, X1 : $i]:
% 0.45/0.72 ((inverse @
% 0.45/0.72 (double_divide @ X1 @
% 0.45/0.72 (inverse @ (double_divide @ X0 @ (inverse @ X1)))))
% 0.45/0.72 = (X0))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl62, zip_derived_cl60])).
% 0.45/0.72 thf(zip_derived_cl145, plain,
% 0.45/0.72 (![X0 : $i]:
% 0.45/0.72 ((inverse @ (double_divide @ X0 @ (inverse @ identity))) = (X0))),
% 0.45/0.72 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl75])).
% 0.45/0.72 thf(zip_derived_cl36, plain, (((identity) = (inverse @ identity))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl32, zip_derived_cl3])).
% 0.45/0.72 thf(zip_derived_cl2, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ X0) = (double_divide @ X0 @ identity))),
% 0.45/0.72 inference('cnf', [status(esa)], [inverse])).
% 0.45/0.72 thf(zip_derived_cl154, plain,
% 0.45/0.72 (![X0 : $i]: ((inverse @ (inverse @ X0)) = (X0))),
% 0.45/0.72 inference('demod', [status(thm)],
% 0.45/0.72 [zip_derived_cl145, zip_derived_cl36, zip_derived_cl2])).
% 0.45/0.72 thf(zip_derived_cl160, plain, (((a2) != (a2))),
% 0.45/0.72 inference('demod', [status(thm)], [zip_derived_cl6, zip_derived_cl154])).
% 0.45/0.72 thf(zip_derived_cl161, plain, ($false),
% 0.45/0.72 inference('simplify', [status(thm)], [zip_derived_cl160])).
% 0.45/0.72
% 0.45/0.72 % SZS output end Refutation
% 0.45/0.72
% 0.45/0.72
% 0.45/0.72 % Terminating...
% 1.52/0.77 % Runner terminated.
% 1.52/0.78 % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------