%------------------------------------------------------------------------------
% File : Zipperpin---2.1.9999
% Problem : GRP600-1 : TPTP v9.2.0. Bugfixed v2.7.0.
% Transfm : none
% Format : tptp:raw
% Command : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.w2kfZtUzNx true
% Computer : n025.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 04:36:45 PM UTC 2025
% Result : Unsatisfiable 0.48s 0.82s
% Output : Refutation 0.48s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.05/0.11 % Problem : GRP600-1 : TPTP v9.2.0. Bugfixed v2.7.0.
% 0.05/0.11 % Command : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.w2kfZtUzNx true
% 0.11/0.32 % Computer : n025.cluster.edu
% 0.11/0.32 % Model : x86_64 x86_64
% 0.11/0.32 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.11/0.32 % Memory : 8042.1875MB
% 0.11/0.32 % OS : Linux 3.10.0-693.el7.x86_64
% 0.11/0.32 % CPULimit : 300
% 0.11/0.32 % WCLimit : 300
% 0.11/0.32 % DateTime : Wed Oct 1 14:25:08 EDT 2025
% 0.11/0.32 % CPUTime :
% 0.11/0.32 % Running portfolio for 300 s
% 0.11/0.32 % File : /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.11/0.32 % Number of cores: 8
% 0.11/0.32 % Python version: Python 3.6.8
% 0.11/0.32 % Running in FO mode
% 0.43/0.57 % Total configuration time : 435
% 0.43/0.57 % Estimated wc time : 1092
% 0.43/0.57 % Estimated cpu time (7 cpus) : 156.0
% 0.46/0.68 % /export/starexec/sandbox2/solver/bin/fo/fo3_bce.sh running for 75s
% 0.46/0.68 % /export/starexec/sandbox2/solver/bin/fo/fo6_bce.sh running for 75s
% 0.46/0.68 % /export/starexec/sandbox2/solver/bin/fo/fo7.sh running for 63s
% 0.46/0.69 % /export/starexec/sandbox2/solver/bin/fo/fo1_av.sh running for 75s
% 0.48/0.69 % /export/starexec/sandbox2/solver/bin/fo/fo13.sh running for 50s
% 0.48/0.69 % /export/starexec/sandbox2/solver/bin/fo/fo5.sh running for 50s
% 0.48/0.69 % /export/starexec/sandbox2/solver/bin/fo/fo4.sh running for 50s
% 0.48/0.82 % Solved by fo/fo7.sh.
% 0.48/0.82 % done 63 iterations in 0.110s
% 0.48/0.82 % SZS status Theorem for '/export/starexec/sandbox2/benchmark/theBenchmark.p'
% 0.48/0.82 % SZS output start Refutation
% 0.48/0.82 thf(multiply_type, type, multiply: $i > $i > $i).
% 0.48/0.82 thf(b_type, type, b: $i).
% 0.48/0.82 thf(double_divide_type, type, double_divide: $i > $i > $i).
% 0.48/0.82 thf(a_type, type, a: $i).
% 0.48/0.82 thf(inverse_type, type, inverse: $i > $i).
% 0.48/0.82 thf(prove_these_axioms_4, conjecture,
% 0.48/0.82 (( multiply @ a @ b ) = ( multiply @ b @ a ))).
% 0.48/0.82 thf(zf_stmt_0, negated_conjecture,
% 0.48/0.82 (( multiply @ a @ b ) != ( multiply @ b @ a )),
% 0.48/0.82 inference('cnf.neg', [status(esa)], [prove_these_axioms_4])).
% 0.48/0.82 thf(zip_derived_cl2, plain, (((multiply @ a @ b) != (multiply @ b @ a))),
% 0.48/0.82 inference('cnf', [status(esa)], [zf_stmt_0])).
% 0.48/0.82 thf(multiply, axiom,
% 0.48/0.82 (( multiply @ A @ B ) = ( inverse @ ( double_divide @ B @ A ) ))).
% 0.48/0.82 thf(zip_derived_cl1, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((multiply @ X1 @ X0) = (inverse @ (double_divide @ X0 @ X1)))),
% 0.48/0.82 inference('cnf', [status(esa)], [multiply])).
% 0.48/0.82 thf(zip_derived_cl1, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((multiply @ X1 @ X0) = (inverse @ (double_divide @ X0 @ X1)))),
% 0.48/0.82 inference('cnf', [status(esa)], [multiply])).
% 0.48/0.82 thf(zip_derived_cl3, plain,
% 0.48/0.82 (((inverse @ (double_divide @ b @ a))
% 0.48/0.82 != (inverse @ (double_divide @ a @ b)))),
% 0.48/0.82 inference('demod', [status(thm)],
% 0.48/0.82 [zip_derived_cl2, zip_derived_cl1, zip_derived_cl1])).
% 0.48/0.82 thf(single_axiom, axiom,
% 0.48/0.82 (( double_divide @
% 0.48/0.82 ( double_divide @ A @ B ) @
% 0.48/0.82 ( inverse @
% 0.48/0.82 ( double_divide @
% 0.48/0.82 A @ ( inverse @ ( double_divide @ ( inverse @ C ) @ B ) ) ) ) ) =
% 0.48/0.82 ( C ))).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl4, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ (double_divide @ X3 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X3 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl0, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl4, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ (double_divide @ X3 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X3 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl0, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl22, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @
% 0.48/0.82 (double_divide @ (double_divide @ X3 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X3 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ (inverse @ X1)) @ X2))))) @
% 0.48/0.82 (inverse @ X0))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl4, zip_derived_cl4])).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl31, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X1) @ (inverse @ X0))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl22, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl35, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ (inverse @ X1)) @
% 0.48/0.82 (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl31, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl31, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X1) @ (inverse @ X0))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl22, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl52, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X0 @ (inverse @ X0)))) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl35, zip_derived_cl31])).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl63, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ (inverse @ X0) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X2 @ (inverse @ X2))))))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl52, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl52, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X0 @ (inverse @ X0)))) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl35, zip_derived_cl31])).
% 0.48/0.82 thf(zip_derived_cl77, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ X0 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ (inverse @ X1))))
% 0.48/0.82 = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl63, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl52, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X0 @ (inverse @ X0)))) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl35, zip_derived_cl31])).
% 0.48/0.82 thf(zip_derived_cl170, plain,
% 0.48/0.82 (![X0 : $i]: ((inverse @ (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl77, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl170, plain,
% 0.48/0.82 (![X0 : $i]: ((inverse @ (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl77, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl35, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ (inverse @ X1)) @
% 0.48/0.82 (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl31, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl52, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X0 @ (inverse @ X0)))) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl35, zip_derived_cl31])).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl0, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X2) @
% 0.48/0.82 (inverse @
% 0.48/0.82 (double_divide @ X1 @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2)))))
% 0.48/0.82 = (X0))),
% 0.48/0.82 inference('cnf', [status(esa)], [single_axiom])).
% 0.48/0.82 thf(zip_derived_cl5, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @
% 0.48/0.82 (double_divide @ (double_divide @ (inverse @ X1) @ X2) @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2))) @
% 0.48/0.82 (inverse @ X0)) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl0, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl69, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @
% 0.48/0.82 (double_divide @
% 0.48/0.82 (double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X2 @ (inverse @ X2)))) @
% 0.48/0.82 (inverse @ X0)) @
% 0.48/0.82 (inverse @ X0)) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl52, zip_derived_cl5])).
% 0.48/0.82 thf(zip_derived_cl52, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (inverse @ X1) @
% 0.48/0.82 (inverse @ (double_divide @ X0 @ (inverse @ X0)))) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl35, zip_derived_cl31])).
% 0.48/0.82 thf(zip_derived_cl79, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ (inverse @ X0)) @
% 0.48/0.82 (inverse @ X0)) = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl69, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl92, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ X0 @ (inverse @ X0))
% 0.48/0.82 = (double_divide @ X1 @ (inverse @ X1)))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl35, zip_derived_cl79])).
% 0.48/0.82 thf(zip_derived_cl189, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (inverse @ X0) @ X0)
% 0.48/0.82 = (double_divide @ X1 @ (inverse @ X1)))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl170, zip_derived_cl92])).
% 0.48/0.82 thf(zip_derived_cl5, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @
% 0.48/0.82 (double_divide @ (double_divide @ (inverse @ X1) @ X2) @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X0) @ X2))) @
% 0.48/0.82 (inverse @ X0)) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl0, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl236, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @
% 0.48/0.82 (double_divide @ (double_divide @ X0 @ (inverse @ X0)) @
% 0.48/0.82 (inverse @ (double_divide @ (inverse @ X2) @ X1))) @
% 0.48/0.82 (inverse @ X2)) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl189, zip_derived_cl5])).
% 0.48/0.82 thf(zip_derived_cl35, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ (inverse @ X1)) @
% 0.48/0.82 (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl31, zip_derived_cl0])).
% 0.48/0.82 thf(zip_derived_cl262, plain,
% 0.48/0.82 (![X1 : $i, X2 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ (inverse @ X2) @ X1) @
% 0.48/0.82 (inverse @ X2)) = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl236, zip_derived_cl35])).
% 0.48/0.82 thf(zip_derived_cl372, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ (inverse @ (inverse @ X0)) @ X1) @
% 0.48/0.82 X0) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl170, zip_derived_cl262])).
% 0.48/0.82 thf(zip_derived_cl170, plain,
% 0.48/0.82 (![X0 : $i]: ((inverse @ (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl77, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl384, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X0 @ X1) @ X0) = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl372, zip_derived_cl170])).
% 0.48/0.82 thf(zip_derived_cl170, plain,
% 0.48/0.82 (![X0 : $i]: ((inverse @ (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl77, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl79, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ (inverse @ X0)) @
% 0.48/0.82 (inverse @ X0)) = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl69, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl187, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ (inverse @ (inverse @ X0))) @
% 0.48/0.82 X0) = (X1))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl170, zip_derived_cl79])).
% 0.48/0.82 thf(zip_derived_cl170, plain,
% 0.48/0.82 (![X0 : $i]: ((inverse @ (inverse @ X0)) = (X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl77, zip_derived_cl52])).
% 0.48/0.82 thf(zip_derived_cl204, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ (double_divide @ X1 @ X0) @ X0) = (X1))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl187, zip_derived_cl170])).
% 0.48/0.82 thf(zip_derived_cl395, plain,
% 0.48/0.82 (![X0 : $i, X1 : $i]:
% 0.48/0.82 ((double_divide @ X0 @ X1) = (double_divide @ X1 @ X0))),
% 0.48/0.82 inference('sup+', [status(thm)], [zip_derived_cl384, zip_derived_cl204])).
% 0.48/0.82 thf(zip_derived_cl483, plain,
% 0.48/0.82 (((inverse @ (double_divide @ a @ b))
% 0.48/0.82 != (inverse @ (double_divide @ a @ b)))),
% 0.48/0.82 inference('demod', [status(thm)], [zip_derived_cl3, zip_derived_cl395])).
% 0.48/0.82 thf(zip_derived_cl484, plain, ($false),
% 0.48/0.82 inference('simplify', [status(thm)], [zip_derived_cl483])).
% 0.48/0.82
% 0.48/0.82 % SZS output end Refutation
% 0.48/0.82
% 0.48/0.82
% 0.48/0.82 % Terminating...
% 0.50/0.90 % Runner terminated.
% 0.50/0.91 % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------