%------------------------------------------------------------------------------
% File : Zipperpin---2.1.9999
% Problem : SET002-6 : TPTP v9.2.0. Bugfixed v2.1.0.
% Transfm : none
% Format : tptp:raw
% Command : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.tJGb6KDbgL true
% Computer : n027.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 04:51:03 PM UTC 2025
% Result : Unsatisfiable 40.43s 6.37s
% Output : Refutation 40.43s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.08/0.09 % Problem : SET002-6 : TPTP v9.2.0. Bugfixed v2.1.0.
% 0.08/0.10 % Command : python3 /export/starexec/sandbox2/solver/bin/portfolio.lams.parallel.py %s %d /export/starexec/sandbox2/tmp/tmp.tJGb6KDbgL true
% 0.10/0.30 % Computer : n027.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 13:07:53 EDT 2025
% 0.10/0.30 % CPUTime :
% 0.10/0.30 % Running portfolio for 300 s
% 0.10/0.30 % File : /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.10/0.31 % Number of cores: 8
% 0.10/0.31 % Python version: Python 3.6.8
% 0.10/0.31 % Running in FO mode
% 0.43/0.55 % Total configuration time : 435
% 0.43/0.55 % Estimated wc time : 1092
% 0.43/0.55 % Estimated cpu time (7 cpus) : 156.0
% 0.45/0.66 % /export/starexec/sandbox2/solver/bin/fo/fo6_bce.sh running for 75s
% 0.45/0.66 % /export/starexec/sandbox2/solver/bin/fo/fo1_av.sh running for 75s
% 0.45/0.67 % /export/starexec/sandbox2/solver/bin/fo/fo3_bce.sh running for 75s
% 0.45/0.67 % /export/starexec/sandbox2/solver/bin/fo/fo7.sh running for 63s
% 0.45/0.67 % /export/starexec/sandbox2/solver/bin/fo/fo5.sh running for 50s
% 0.45/0.67 % /export/starexec/sandbox2/solver/bin/fo/fo4.sh running for 50s
% 0.45/0.67 % /export/starexec/sandbox2/solver/bin/fo/fo13.sh running for 50s
% 0.47/0.71 % /export/starexec/sandbox2/solver/bin/fo/fo1_lcnf.sh running for 50s
% 40.43/6.37 % Solved by fo/fo6_bce.sh.
% 40.43/6.37 % BCE start: 113
% 40.43/6.37 % BCE eliminated: 1
% 40.43/6.37 % PE start: 112
% 40.43/6.37 logic: eq
% 40.43/6.37 % PE eliminated: 19
% 40.43/6.37 % done 2111 iterations in 5.679s
% 40.43/6.37 % SZS status Theorem for '/export/starexec/sandbox2/benchmark/theBenchmark.p'
% 40.43/6.37 % SZS output start Refutation
% 40.43/6.37 thf(universal_class_type, type, universal_class: $i).
% 40.43/6.37 thf(union_type, type, union: $i > $i > $i).
% 40.43/6.37 thf(member_type, type, member: $i > $i > $o).
% 40.43/6.37 thf(x_type, type, x: $i).
% 40.43/6.37 thf(complement_type, type, complement: $i > $i).
% 40.43/6.37 thf(intersection_type, type, intersection: $i > $i > $i).
% 40.43/6.37 thf(subclass_type, type, subclass: $i > $i > $o).
% 40.43/6.37 thf(not_subclass_element_type, type, not_subclass_element: $i > $i > $i).
% 40.43/6.37 thf(prove_idempotency_of_union_1, conjecture, (( union @ x @ x ) = ( x ))).
% 40.43/6.37 thf(zf_stmt_0, negated_conjecture, (( union @ x @ x ) != ( x )),
% 40.43/6.37 inference('cnf.neg', [status(esa)], [prove_idempotency_of_union_1])).
% 40.43/6.37 thf(zip_derived_cl112, plain, (((union @ x @ x) != (x))),
% 40.43/6.37 inference('cnf', [status(esa)], [zf_stmt_0])).
% 40.43/6.37 thf(not_subclass_members1, axiom,
% 40.43/6.37 (( member @ ( not_subclass_element @ X @ Y ) @ X ) | ( subclass @ X @ Y ))).
% 40.43/6.37 thf(zip_derived_cl1, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @ (not_subclass_element @ X0 @ X1) @ X0)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members1])).
% 40.43/6.37 thf(intersection3, axiom,
% 40.43/6.37 (( ~( member @ Z @ X ) ) | ( ~( member @ Z @ Y ) ) |
% 40.43/6.37 ( member @ Z @ ( intersection @ X @ Y ) ))).
% 40.43/6.37 thf(zip_derived_cl22, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i, X2 : $i]:
% 40.43/6.37 (~ (member @ X0 @ X1)
% 40.43/6.37 | ~ (member @ X0 @ X2)
% 40.43/6.37 | (member @ X0 @ (intersection @ X1 @ X2)))),
% 40.43/6.37 inference('cnf', [status(esa)], [intersection3])).
% 40.43/6.37 thf(not_subclass_members2, axiom,
% 40.43/6.37 (( ~( member @ ( not_subclass_element @ X @ Y ) @ Y ) ) |
% 40.43/6.37 ( subclass @ X @ Y ))).
% 40.43/6.37 thf(zip_derived_cl2, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ (not_subclass_element @ X0 @ X1) @ X1)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members2])).
% 40.43/6.37 thf(zip_derived_cl603, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i, X2 : $i]:
% 40.43/6.37 (~ (member @ (not_subclass_element @ X2 @ (intersection @ X1 @ X0)) @
% 40.43/6.37 X0)
% 40.43/6.37 | ~ (member @
% 40.43/6.37 (not_subclass_element @ X2 @ (intersection @ X1 @ X0)) @ X1)
% 40.43/6.37 | (subclass @ X2 @ (intersection @ X1 @ X0)))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl22, zip_derived_cl2])).
% 40.43/6.37 thf(zip_derived_cl2080, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ X1 @ (intersection @ X0 @ X0))
% 40.43/6.37 | ~ (member @
% 40.43/6.37 (not_subclass_element @ X1 @ (intersection @ X0 @ X0)) @ X0))),
% 40.43/6.37 inference('eq_fact', [status(thm)], [zip_derived_cl603])).
% 40.43/6.37 thf(zip_derived_cl7466, plain,
% 40.43/6.37 (![X0 : $i]:
% 40.43/6.37 ( (subclass @ X0 @ (intersection @ X0 @ X0))
% 40.43/6.37 | (subclass @ X0 @ (intersection @ X0 @ X0)))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl2080])).
% 40.43/6.37 thf(zip_derived_cl7486, plain,
% 40.43/6.37 (![X0 : $i]: (subclass @ X0 @ (intersection @ X0 @ X0))),
% 40.43/6.37 inference('simplify', [status(thm)], [zip_derived_cl7466])).
% 40.43/6.37 thf(zip_derived_cl1, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @ (not_subclass_element @ X0 @ X1) @ X0)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members1])).
% 40.43/6.37 thf(intersection1, axiom,
% 40.43/6.37 (( ~( member @ Z @ ( intersection @ X @ Y ) ) ) | ( member @ Z @ X ))).
% 40.43/6.37 thf(zip_derived_cl20, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i, X2 : $i]:
% 40.43/6.37 (~ (member @ X0 @ (intersection @ X1 @ X2)) | (member @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [intersection1])).
% 40.43/6.37 thf(zip_derived_cl558, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i, X2 : $i]:
% 40.43/6.37 ( (subclass @ (intersection @ X1 @ X0) @ X2)
% 40.43/6.37 | (member @
% 40.43/6.37 (not_subclass_element @ (intersection @ X1 @ X0) @ X2) @ X1))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl20])).
% 40.43/6.37 thf(zip_derived_cl2, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ (not_subclass_element @ X0 @ X1) @ X1)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members2])).
% 40.43/6.37 thf(zip_derived_cl1590, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ (intersection @ X0 @ X1) @ X0)
% 40.43/6.37 | (subclass @ (intersection @ X0 @ X1) @ X0))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl558, zip_derived_cl2])).
% 40.43/6.37 thf(zip_derived_cl1607, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]: (subclass @ (intersection @ X0 @ X1) @ X0)),
% 40.43/6.37 inference('simplify', [status(thm)], [zip_derived_cl1590])).
% 40.43/6.37 thf(subclass_implies_equal, axiom,
% 40.43/6.37 (( ~( subclass @ X @ Y ) ) | ( ~( subclass @ Y @ X ) ) | ( ( X ) = ( Y ) ))).
% 40.43/6.37 thf(zip_derived_cl6, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (subclass @ X0 @ X1) | ~ (subclass @ X1 @ X0) | ((X0) = (X1)))),
% 40.43/6.37 inference('cnf', [status(esa)], [subclass_implies_equal])).
% 40.43/6.37 thf(zip_derived_cl1710, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (subclass @ X0 @ (intersection @ X0 @ X1))
% 40.43/6.37 | ((intersection @ X0 @ X1) = (X0)))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1607, zip_derived_cl6])).
% 40.43/6.37 thf(zip_derived_cl7516, plain,
% 40.43/6.37 (![X0 : $i]: ((intersection @ X0 @ X0) = (X0))),
% 40.43/6.37 inference('s_sup-', [status(thm)],
% 40.43/6.37 [zip_derived_cl7486, zip_derived_cl1710])).
% 40.43/6.37 thf(union, axiom,
% 40.43/6.37 (( complement @ ( intersection @ ( complement @ X ) @ ( complement @ Y ) ) ) =
% 40.43/6.37 ( union @ X @ Y ))).
% 40.43/6.37 thf(zip_derived_cl25, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ((complement @ (intersection @ (complement @ X0) @ (complement @ X1)))
% 40.43/6.37 = (union @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [union])).
% 40.43/6.37 thf(zip_derived_cl7578, plain,
% 40.43/6.37 (![X0 : $i]: ((complement @ (complement @ X0)) = (union @ X0 @ X0))),
% 40.43/6.37 inference('s_sup+', [status(thm)], [zip_derived_cl7516, zip_derived_cl25])).
% 40.43/6.37 thf(zip_derived_cl7741, plain, (((complement @ (complement @ x)) != (x))),
% 40.43/6.37 inference('demod', [status(thm)], [zip_derived_cl112, zip_derived_cl7578])).
% 40.43/6.37 thf(complement2, axiom,
% 40.43/6.37 (( ~( member @ Z @ universal_class ) ) |
% 40.43/6.37 ( member @ Z @ ( complement @ X ) ) | ( member @ Z @ X ))).
% 40.43/6.37 thf(zip_derived_cl24, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ X0 @ universal_class)
% 40.43/6.37 | (member @ X0 @ (complement @ X1))
% 40.43/6.37 | (member @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [complement2])).
% 40.43/6.37 thf(zip_derived_cl1, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @ (not_subclass_element @ X0 @ X1) @ X0)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members1])).
% 40.43/6.37 thf(complement1, axiom,
% 40.43/6.37 (( ~( member @ Z @ ( complement @ X ) ) ) | ( ~( member @ Z @ X ) ))).
% 40.43/6.37 thf(zip_derived_cl23, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ X0 @ (complement @ X1)) | ~ (member @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [complement1])).
% 40.43/6.37 thf(zip_derived_cl494, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ (complement @ X0) @ X1)
% 40.43/6.37 | ~ (member @ (not_subclass_element @ (complement @ X0) @ X1) @ X0))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl23])).
% 40.43/6.37 thf(zip_derived_cl620, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @
% 40.43/6.37 (not_subclass_element @ (complement @ (complement @ X0)) @ X1) @ X0)
% 40.43/6.37 | ~ (member @
% 40.43/6.37 (not_subclass_element @ (complement @ (complement @ X0)) @ X1) @
% 40.43/6.37 universal_class)
% 40.43/6.37 | (subclass @ (complement @ (complement @ X0)) @ X1))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl24, zip_derived_cl494])).
% 40.43/6.37 thf(zip_derived_cl1, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @ (not_subclass_element @ X0 @ X1) @ X0)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members1])).
% 40.43/6.37 thf(class_elements_are_sets, axiom, (subclass @ X @ universal_class)).
% 40.43/6.37 thf(zip_derived_cl3, plain, (![X0 : $i]: (subclass @ X0 @ universal_class)),
% 40.43/6.37 inference('cnf', [status(esa)], [class_elements_are_sets])).
% 40.43/6.37 thf(subclass_members, axiom,
% 40.43/6.37 (( ~( subclass @ X @ Y ) ) | ( ~( member @ U @ X ) ) | ( member @ U @ Y ))).
% 40.43/6.37 thf(zip_derived_cl0, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i, X2 : $i]:
% 40.43/6.37 (~ (subclass @ X0 @ X1) | ~ (member @ X2 @ X0) | (member @ X2 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [subclass_members])).
% 40.43/6.37 thf(zip_derived_cl493, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ X1 @ X0) | (member @ X1 @ universal_class))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl3, zip_derived_cl0])).
% 40.43/6.37 thf(zip_derived_cl498, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ X0 @ X1)
% 40.43/6.37 | (member @ (not_subclass_element @ X0 @ X1) @ universal_class))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl493])).
% 40.43/6.37 thf(zip_derived_cl2259, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ (complement @ (complement @ X0)) @ X1)
% 40.43/6.37 | (member @
% 40.43/6.37 (not_subclass_element @ (complement @ (complement @ X0)) @ X1) @
% 40.43/6.37 X0))),
% 40.43/6.37 inference('clc', [status(thm)], [zip_derived_cl620, zip_derived_cl498])).
% 40.43/6.37 thf(zip_derived_cl2, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ (not_subclass_element @ X0 @ X1) @ X1)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members2])).
% 40.43/6.37 thf(zip_derived_cl2288, plain,
% 40.43/6.37 (![X0 : $i]:
% 40.43/6.37 ( (subclass @ (complement @ (complement @ X0)) @ X0)
% 40.43/6.37 | (subclass @ (complement @ (complement @ X0)) @ X0))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl2259, zip_derived_cl2])).
% 40.43/6.37 thf(zip_derived_cl2299, plain,
% 40.43/6.37 (![X0 : $i]: (subclass @ (complement @ (complement @ X0)) @ X0)),
% 40.43/6.37 inference('simplify', [status(thm)], [zip_derived_cl2288])).
% 40.43/6.37 thf(zip_derived_cl6, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (subclass @ X0 @ X1) | ~ (subclass @ X1 @ X0) | ((X0) = (X1)))),
% 40.43/6.37 inference('cnf', [status(esa)], [subclass_implies_equal])).
% 40.43/6.37 thf(zip_derived_cl2391, plain,
% 40.43/6.37 (![X0 : $i]:
% 40.43/6.37 (~ (subclass @ X0 @ (complement @ (complement @ X0)))
% 40.43/6.37 | ((complement @ (complement @ X0)) = (X0)))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl2299, zip_derived_cl6])).
% 40.43/6.37 thf(zip_derived_cl1, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @ (not_subclass_element @ X0 @ X1) @ X0)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members1])).
% 40.43/6.37 thf(zip_derived_cl24, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ X0 @ universal_class)
% 40.43/6.37 | (member @ X0 @ (complement @ X1))
% 40.43/6.37 | (member @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [complement2])).
% 40.43/6.37 thf(zip_derived_cl2, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ (not_subclass_element @ X0 @ X1) @ X1)
% 40.43/6.37 | (subclass @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [not_subclass_members2])).
% 40.43/6.37 thf(zip_derived_cl619, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (member @ (not_subclass_element @ X1 @ (complement @ X0)) @ X0)
% 40.43/6.37 | ~ (member @ (not_subclass_element @ X1 @ (complement @ X0)) @
% 40.43/6.37 universal_class)
% 40.43/6.37 | (subclass @ X1 @ (complement @ X0)))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl24, zip_derived_cl2])).
% 40.43/6.37 thf(zip_derived_cl498, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ X0 @ X1)
% 40.43/6.37 | (member @ (not_subclass_element @ X0 @ X1) @ universal_class))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl493])).
% 40.43/6.37 thf(zip_derived_cl2192, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ X1 @ (complement @ X0))
% 40.43/6.37 | (member @ (not_subclass_element @ X1 @ (complement @ X0)) @ X0))),
% 40.43/6.37 inference('clc', [status(thm)], [zip_derived_cl619, zip_derived_cl498])).
% 40.43/6.37 thf(zip_derived_cl23, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 (~ (member @ X0 @ (complement @ X1)) | ~ (member @ X0 @ X1))),
% 40.43/6.37 inference('cnf', [status(esa)], [complement1])).
% 40.43/6.37 thf(zip_derived_cl2205, plain,
% 40.43/6.37 (![X0 : $i, X1 : $i]:
% 40.43/6.37 ( (subclass @ X1 @ (complement @ (complement @ X0)))
% 40.43/6.37 | ~ (member @
% 40.43/6.37 (not_subclass_element @ X1 @ (complement @ (complement @ X0))) @
% 40.43/6.37 X0))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl2192, zip_derived_cl23])).
% 40.43/6.37 thf(zip_derived_cl21264, plain,
% 40.43/6.37 (![X0 : $i]:
% 40.43/6.37 ( (subclass @ X0 @ (complement @ (complement @ X0)))
% 40.43/6.37 | (subclass @ X0 @ (complement @ (complement @ X0))))),
% 40.43/6.37 inference('s_sup-', [status(thm)], [zip_derived_cl1, zip_derived_cl2205])).
% 40.43/6.37 thf(zip_derived_cl21313, plain,
% 40.43/6.37 (![X0 : $i]: (subclass @ X0 @ (complement @ (complement @ X0)))),
% 40.43/6.37 inference('simplify', [status(thm)], [zip_derived_cl21264])).
% 40.43/6.37 thf(zip_derived_cl21352, plain,
% 40.43/6.37 (![X0 : $i]: ((complement @ (complement @ X0)) = (X0))),
% 40.43/6.37 inference('demod', [status(thm)],
% 40.43/6.37 [zip_derived_cl2391, zip_derived_cl21313])).
% 40.43/6.37 thf(zip_derived_cl21407, plain, (((x) != (x))),
% 40.43/6.37 inference('demod', [status(thm)],
% 40.43/6.37 [zip_derived_cl7741, zip_derived_cl21352])).
% 40.43/6.37 thf(zip_derived_cl21408, plain, ($false),
% 40.43/6.37 inference('simplify', [status(thm)], [zip_derived_cl21407])).
% 40.43/6.37
% 40.43/6.37 % SZS output end Refutation
% 40.43/6.37
% 40.43/6.37
% 40.43/6.37 % Terminating...
% 40.43/6.41 % Runner terminated.
% 40.43/6.41 % Zipperpin 1.5 exiting
%------------------------------------------------------------------------------