%------------------------------------------------------------------------------
% File : Zipperpin---2.1.9999
% Problem : GRP554-1 : TPTP v9.2.0. Released v2.6.0.
% Transfm : none
% Format : tptp:raw
% Command : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.CuD8hfKExZ true
% Computer : n011.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 04:36:40 PM UTC 2025
% Result : Unsatisfiable 0.61s 1.13s
% Output : Refutation 0.61s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.07/0.12 % Problem : GRP554-1 : TPTP v9.2.0. Released v2.6.0.
% 0.07/0.13 % Command : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.CuD8hfKExZ true
% 0.14/0.34 % Computer : n011.cluster.edu
% 0.14/0.34 % Model : x86_64 x86_64
% 0.14/0.34 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.14/0.34 % Memory : 8042.1875MB
% 0.14/0.34 % OS : Linux 3.10.0-693.el7.x86_64
% 0.14/0.34 % CPULimit : 300
% 0.14/0.34 % WCLimit : 300
% 0.14/0.34 % DateTime : Wed Oct 1 14:05:08 EDT 2025
% 0.14/0.34 % CPUTime :
% 0.14/0.34 % Running portfolio for 300 s
% 0.14/0.34 % File : /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.14/0.34 % Number of cores: 8
% 0.14/0.34 % Python version: Python 3.6.8
% 0.14/0.35 % Running in FO mode
% 0.59/0.64 % Total configuration time : 435
% 0.59/0.64 % Estimated wc time : 1092
% 0.59/0.64 % Estimated cpu time (7 cpus) : 156.0
% 0.60/0.76 % /export/starexec/sandbox2/solver/bin/fo/fo3_bce.sh running for 75s
% 0.60/0.77 % /export/starexec/sandbox2/solver/bin/fo/fo6_bce.sh running for 75s
% 0.60/0.77 % /export/starexec/sandbox2/solver/bin/fo/fo13.sh running for 50s
% 0.60/0.77 % /export/starexec/sandbox2/solver/bin/fo/fo7.sh running for 63s
% 0.60/0.77 % /export/starexec/sandbox2/solver/bin/fo/fo1_av.sh running for 75s
% 0.60/0.79 % /export/starexec/sandbox2/solver/bin/fo/fo4.sh running for 50s
% 0.60/0.80 % /export/starexec/sandbox2/solver/bin/fo/fo5.sh running for 50s
% 0.61/1.13 % Solved by fo/fo4.sh.
% 0.61/1.13 % done 67 iterations in 0.313s
% 0.61/1.13 % SZS status Theorem for '/export/starexec/sandbox2/benchmark/theBenchmark.p'
% 0.61/1.13 % SZS output start Refutation
% 0.61/1.13 thf(inverse_type, type, inverse: $i > $i).
% 0.61/1.13 thf(multiply_type, type, multiply: $i > $i > $i).
% 0.61/1.13 thf(a2_type, type, a2: $i).
% 0.61/1.13 thf(divide_type, type, divide: $i > $i > $i).
% 0.61/1.13 thf(b2_type, type, b2: $i).
% 0.61/1.13 thf(prove_these_axioms_2, conjecture,
% 0.61/1.13 (( multiply @ ( multiply @ ( inverse @ b2 ) @ b2 ) @ a2 ) = ( a2 ))).
% 0.61/1.13 thf(zf_stmt_0, negated_conjecture,
% 0.61/1.13 (( multiply @ ( multiply @ ( inverse @ b2 ) @ b2 ) @ a2 ) != ( a2 )),
% 0.61/1.13 inference('cnf.neg', [status(esa)], [prove_these_axioms_2])).
% 0.61/1.13 thf(zip_derived_cl2, plain,
% 0.61/1.13 (((multiply @ (multiply @ (inverse @ b2) @ b2) @ a2) != (a2))),
% 0.61/1.13 inference('cnf', [status(esa)], [zf_stmt_0])).
% 0.61/1.13 thf(single_axiom, axiom,
% 0.61/1.13 (( divide @
% 0.61/1.13 ( divide @ A @ ( inverse @ ( divide @ B @ ( divide @ A @ C ) ) ) ) @ C ) =
% 0.61/1.13 ( B ))).
% 0.61/1.13 thf(zip_derived_cl0, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @
% 0.61/1.13 (divide @ X1 @ (inverse @ (divide @ X0 @ (divide @ X1 @ X2)))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('cnf', [status(esa)], [single_axiom])).
% 0.61/1.13 thf(multiply, axiom,
% 0.61/1.13 (( multiply @ A @ B ) = ( divide @ A @ ( inverse @ B ) ))).
% 0.61/1.13 thf(zip_derived_cl1, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ X0 @ X1) = (divide @ X0 @ (inverse @ X1)))),
% 0.61/1.13 inference('cnf', [status(esa)], [multiply])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl1, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ X0 @ X1) = (divide @ X0 @ (inverse @ X1)))),
% 0.61/1.13 inference('cnf', [status(esa)], [multiply])).
% 0.61/1.13 thf(zip_derived_cl6, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @
% 0.61/1.13 (multiply @ X2 @ (divide @ X0 @ (divide @ X2 @ (inverse @ X1)))) @
% 0.61/1.13 X1) = (X0))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl1, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ X0 @ X1) = (divide @ X0 @ (inverse @ X1)))),
% 0.61/1.13 inference('cnf', [status(esa)], [multiply])).
% 0.61/1.13 thf(zip_derived_cl10, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ (divide @ X0 @ (multiply @ X2 @ X1))) @
% 0.61/1.13 X1) = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl6, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl12, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ X0) @ X1)
% 0.61/1.13 = (multiply @ X3 @
% 0.61/1.13 (divide @ X0 @ (divide @ X3 @ (multiply @ X2 @ X1)))))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl10])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl33, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ (multiply @ X2 @ X1) @ X0) @
% 0.61/1.13 (multiply @ X2 @ X0)) = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl12, zip_derived_cl3])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl4, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((divide @
% 0.61/1.13 (multiply @ (multiply @ X3 @ (divide @ X0 @ (divide @ X3 @ X2))) @
% 0.61/1.13 (divide @ X1 @ X0)) @
% 0.61/1.13 X2) = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl3])).
% 0.61/1.13 thf(zip_derived_cl116, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ X0 @ (divide @ X2 @ (multiply @ X2 @ (divide @ X1 @ X0))))
% 0.61/1.13 = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl33, zip_derived_cl4])).
% 0.61/1.13 thf(zip_derived_cl12, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ X0) @ X1)
% 0.61/1.13 = (multiply @ X3 @
% 0.61/1.13 (divide @ X0 @ (divide @ X3 @ (multiply @ X2 @ X1)))))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl10])).
% 0.61/1.13 thf(zip_derived_cl152, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ X1) @ (divide @ X0 @ X1))
% 0.61/1.13 = (multiply @ X2 @ X0))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl116, zip_derived_cl12])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl5, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X2 @ X0) @ X1)
% 0.61/1.13 = (multiply @ X3 @
% 0.61/1.13 (divide @ X0 @ (divide @ X3 @ (divide @ X2 @ X1)))))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl3, zip_derived_cl3])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl21, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (divide @ (multiply @ X2 @ X1) @ X0) @ (divide @ X2 @ X0))
% 0.61/1.13 = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl5, zip_derived_cl3])).
% 0.61/1.13 thf(zip_derived_cl152, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ X1) @ (divide @ X0 @ X1))
% 0.61/1.13 = (multiply @ X2 @ X0))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl116, zip_derived_cl12])).
% 0.61/1.13 thf(zip_derived_cl179, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X3 @ (divide @ X2 @ X1)) @ X0)
% 0.61/1.13 = (multiply @ X3 @ (divide @ (multiply @ X2 @ X0) @ X1)))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl21, zip_derived_cl152])).
% 0.61/1.13 thf(zip_derived_cl412, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X1 @ X0) @ X3)
% 0.61/1.13 = (multiply @ (multiply @ X1 @ X2) @
% 0.61/1.13 (divide @ (multiply @ X0 @ X3) @ X2)))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl152, zip_derived_cl179])).
% 0.61/1.13 thf(zip_derived_cl152, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ X1) @ (divide @ X0 @ X1))
% 0.61/1.13 = (multiply @ X2 @ X0))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl116, zip_derived_cl12])).
% 0.61/1.13 thf(zip_derived_cl426, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X3 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X1 @ X0) @ X3)
% 0.61/1.13 = (multiply @ X1 @ (multiply @ X0 @ X3)))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl412, zip_derived_cl152])).
% 0.61/1.13 thf(zip_derived_cl447, plain,
% 0.61/1.13 (((multiply @ (inverse @ b2) @ (multiply @ b2 @ a2)) != (a2))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl2, zip_derived_cl426])).
% 0.61/1.13 thf(zip_derived_cl426, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X3 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X1 @ X0) @ X3)
% 0.61/1.13 = (multiply @ X1 @ (multiply @ X0 @ X3)))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl412, zip_derived_cl152])).
% 0.61/1.13 thf(zip_derived_cl116, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ X0 @ (divide @ X2 @ (multiply @ X2 @ (divide @ X1 @ X0))))
% 0.61/1.13 = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl33, zip_derived_cl4])).
% 0.61/1.13 thf(zip_derived_cl468, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i, X3 : $i]:
% 0.61/1.13 ((divide @ X0 @
% 0.61/1.13 (divide @ (multiply @ X3 @ X2) @
% 0.61/1.13 (multiply @ X3 @ (multiply @ X2 @ (divide @ X1 @ X0)))))
% 0.61/1.13 = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl426, zip_derived_cl116])).
% 0.61/1.13 thf(zip_derived_cl1, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ X0 @ X1) = (divide @ X0 @ (inverse @ X1)))),
% 0.61/1.13 inference('cnf', [status(esa)], [multiply])).
% 0.61/1.13 thf(zip_derived_cl152, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ X1) @ (divide @ X0 @ X1))
% 0.61/1.13 = (multiply @ X2 @ X0))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl116, zip_derived_cl12])).
% 0.61/1.13 thf(zip_derived_cl178, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((multiply @ (multiply @ X2 @ (inverse @ X0)) @ (multiply @ X1 @ X0))
% 0.61/1.13 = (multiply @ X2 @ X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl1, zip_derived_cl152])).
% 0.61/1.13 thf(zip_derived_cl33, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ (multiply @ X2 @ X1) @ X0) @
% 0.61/1.13 (multiply @ X2 @ X0)) = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl12, zip_derived_cl3])).
% 0.61/1.13 thf(zip_derived_cl199, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ X0) @
% 0.61/1.13 (multiply @ X1 @ (multiply @ X0 @ X2))) = (inverse @ X2))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl178, zip_derived_cl33])).
% 0.61/1.13 thf(zip_derived_cl1, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ X0 @ X1) = (divide @ X0 @ (inverse @ X1)))),
% 0.61/1.13 inference('cnf', [status(esa)], [multiply])).
% 0.61/1.13 thf(zip_derived_cl500, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]: ((multiply @ X0 @ (divide @ X1 @ X0)) = (X1))),
% 0.61/1.13 inference('demod', [status(thm)],
% 0.61/1.13 [zip_derived_cl468, zip_derived_cl199, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl116, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ X0 @ (divide @ X2 @ (multiply @ X2 @ (divide @ X1 @ X0))))
% 0.61/1.13 = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl33, zip_derived_cl4])).
% 0.61/1.13 thf(zip_derived_cl3, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X1 @ (divide @ X0 @ (divide @ X1 @ X2))) @ X2)
% 0.61/1.13 = (X0))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl0, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl149, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i, X2 : $i]:
% 0.61/1.13 ((divide @ (multiply @ X2 @ X0) @ (multiply @ X2 @ (divide @ X0 @ X1)))
% 0.61/1.13 = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl116, zip_derived_cl3])).
% 0.61/1.13 thf(zip_derived_cl613, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]: ((divide @ (multiply @ X1 @ X0) @ X0) = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl500, zip_derived_cl149])).
% 0.61/1.13 thf(zip_derived_cl500, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]: ((multiply @ X0 @ (divide @ X1 @ X0)) = (X1))),
% 0.61/1.13 inference('demod', [status(thm)],
% 0.61/1.13 [zip_derived_cl468, zip_derived_cl199, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl667, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]: ((multiply @ X1 @ X0) = (multiply @ X0 @ X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl613, zip_derived_cl500])).
% 0.61/1.13 thf(zip_derived_cl1, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ X0 @ X1) = (divide @ X0 @ (inverse @ X1)))),
% 0.61/1.13 inference('cnf', [status(esa)], [multiply])).
% 0.61/1.13 thf(zip_derived_cl500, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]: ((multiply @ X0 @ (divide @ X1 @ X0)) = (X1))),
% 0.61/1.13 inference('demod', [status(thm)],
% 0.61/1.13 [zip_derived_cl468, zip_derived_cl199, zip_derived_cl1])).
% 0.61/1.13 thf(zip_derived_cl620, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ (inverse @ X0) @ (multiply @ X1 @ X0)) = (X1))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl1, zip_derived_cl500])).
% 0.61/1.13 thf(zip_derived_cl780, plain,
% 0.61/1.13 (![X0 : $i, X1 : $i]:
% 0.61/1.13 ((multiply @ (inverse @ X1) @ (multiply @ X1 @ X0)) = (X0))),
% 0.61/1.13 inference('sup+', [status(thm)], [zip_derived_cl667, zip_derived_cl620])).
% 0.61/1.13 thf(zip_derived_cl1133, plain, (((a2) != (a2))),
% 0.61/1.13 inference('demod', [status(thm)], [zip_derived_cl447, zip_derived_cl780])).
% 0.61/1.13 thf(zip_derived_cl1134, plain, ($false),
% 0.61/1.13 inference('simplify', [status(thm)], [zip_derived_cl1133])).
% 0.61/1.13
% 0.61/1.13 % SZS output end Refutation
% 0.61/1.13
% 0.61/1.13
% 0.61/1.13 % Terminating...
% 3.58/1.19 % Runner terminated.
% 3.58/1.20 % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------