TSTP Solution File: SET411-6 by Prover9---1109a
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- Process Solution
%------------------------------------------------------------------------------
% File : Prover9---1109a
% Problem : SET411-6 : TPTP v8.1.0. Bugfixed v2.1.0.
% Transfm : none
% Format : tptp:raw
% Command : tptp2X_and_run_prover9 %d %s
% Computer : n026.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 : 600s
% DateTime : Tue Jul 19 04:29:26 EDT 2022
% Result : Unsatisfiable 4.95s 5.23s
% Output : Refutation 4.95s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.10/0.12 % Problem : SET411-6 : TPTP v8.1.0. Bugfixed v2.1.0.
% 0.10/0.12 % Command : tptp2X_and_run_prover9 %d %s
% 0.12/0.33 % Computer : n026.cluster.edu
% 0.12/0.33 % Model : x86_64 x86_64
% 0.12/0.33 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.33 % Memory : 8042.1875MB
% 0.12/0.33 % OS : Linux 3.10.0-693.el7.x86_64
% 0.12/0.33 % CPULimit : 300
% 0.12/0.33 % WCLimit : 600
% 0.12/0.33 % DateTime : Sat Jul 9 23:04:11 EDT 2022
% 0.12/0.33 % CPUTime :
% 0.73/1.01 ============================== Prover9 ===============================
% 0.73/1.01 Prover9 (32) version 2009-11A, November 2009.
% 0.73/1.01 Process 22275 was started by sandbox on n026.cluster.edu,
% 0.73/1.01 Sat Jul 9 23:04:11 2022
% 0.73/1.01 The command was "/export/starexec/sandbox/solver/bin/prover9 -t 300 -f /tmp/Prover9_22122_n026.cluster.edu".
% 0.73/1.01 ============================== end of head ===========================
% 0.73/1.01
% 0.73/1.01 ============================== INPUT =================================
% 0.73/1.01
% 0.73/1.01 % Reading from file /tmp/Prover9_22122_n026.cluster.edu
% 0.73/1.01
% 0.73/1.01 set(prolog_style_variables).
% 0.73/1.01 set(auto2).
% 0.73/1.01 % set(auto2) -> set(auto).
% 0.73/1.01 % set(auto) -> set(auto_inference).
% 0.73/1.01 % set(auto) -> set(auto_setup).
% 0.73/1.01 % set(auto_setup) -> set(predicate_elim).
% 0.73/1.01 % set(auto_setup) -> assign(eq_defs, unfold).
% 0.73/1.01 % set(auto) -> set(auto_limits).
% 0.73/1.01 % set(auto_limits) -> assign(max_weight, "100.000").
% 0.73/1.01 % set(auto_limits) -> assign(sos_limit, 20000).
% 0.73/1.01 % set(auto) -> set(auto_denials).
% 0.73/1.01 % set(auto) -> set(auto_process).
% 0.73/1.01 % set(auto2) -> assign(new_constants, 1).
% 0.73/1.01 % set(auto2) -> assign(fold_denial_max, 3).
% 0.73/1.01 % set(auto2) -> assign(max_weight, "200.000").
% 0.73/1.01 % set(auto2) -> assign(max_hours, 1).
% 0.73/1.01 % assign(max_hours, 1) -> assign(max_seconds, 3600).
% 0.73/1.01 % set(auto2) -> assign(max_seconds, 0).
% 0.73/1.01 % set(auto2) -> assign(max_minutes, 5).
% 0.73/1.01 % assign(max_minutes, 5) -> assign(max_seconds, 300).
% 0.73/1.01 % set(auto2) -> set(sort_initial_sos).
% 0.73/1.01 % set(auto2) -> assign(sos_limit, -1).
% 0.73/1.01 % set(auto2) -> assign(lrs_ticks, 3000).
% 0.73/1.01 % set(auto2) -> assign(max_megs, 400).
% 0.73/1.01 % set(auto2) -> assign(stats, some).
% 0.73/1.01 % set(auto2) -> clear(echo_input).
% 0.73/1.01 % set(auto2) -> set(quiet).
% 0.73/1.01 % set(auto2) -> clear(print_initial_clauses).
% 0.73/1.01 % set(auto2) -> clear(print_given).
% 0.73/1.01 assign(lrs_ticks,-1).
% 0.73/1.01 assign(sos_limit,10000).
% 0.73/1.01 assign(order,kbo).
% 0.73/1.01 set(lex_order_vars).
% 0.73/1.01 clear(print_given).
% 0.73/1.01
% 0.73/1.01 % formulas(sos). % not echoed (114 formulas)
% 0.73/1.01
% 0.73/1.01 ============================== end of input ==========================
% 0.73/1.01
% 0.73/1.01 % From the command line: assign(max_seconds, 300).
% 0.73/1.01
% 0.73/1.01 ============================== PROCESS NON-CLAUSAL FORMULAS ==========
% 0.73/1.01
% 0.73/1.01 % Formulas that are not ordinary clauses:
% 0.73/1.01
% 0.73/1.01 ============================== end of process non-clausal formulas ===
% 0.73/1.01
% 0.73/1.01 ============================== PROCESS INITIAL CLAUSES ===============
% 0.73/1.01
% 0.73/1.01 ============================== PREDICATE ELIMINATION =================
% 0.73/1.01 1 -member(null_class,A) | -subclass(image(successor_relation,A),A) | inductive(A) # label(inductive3) # label(axiom). [assumption].
% 0.73/1.01 2 -inductive(A) | member(null_class,A) # label(inductive1) # label(axiom). [assumption].
% 0.73/1.01 3 -inductive(A) | subclass(image(successor_relation,A),A) # label(inductive2) # label(axiom). [assumption].
% 0.73/1.01 4 inductive(omega) # label(omega_is_inductive1) # label(axiom). [assumption].
% 0.73/1.01 Derived: member(null_class,omega). [resolve(4,a,2,a)].
% 0.73/1.01 Derived: subclass(image(successor_relation,omega),omega). [resolve(4,a,3,a)].
% 0.73/1.01 5 -inductive(A) | subclass(omega,A) # label(omega_is_inductive2) # label(axiom). [assumption].
% 0.73/1.01 Derived: subclass(omega,A) | -member(null_class,A) | -subclass(image(successor_relation,A),A). [resolve(5,a,1,c)].
% 0.73/1.01 Derived: subclass(omega,omega). [resolve(5,a,4,a)].
% 0.73/1.01 6 -subclass(compose(A,inverse(A)),identity_relation) | single_valued_class(A) # label(single_valued_class2) # label(axiom). [assumption].
% 0.73/1.01 7 -single_valued_class(A) | subclass(compose(A,inverse(A)),identity_relation) # label(single_valued_class1) # label(axiom). [assumption].
% 0.73/1.01 8 -function(inverse(A)) | -function(A) | one_to_one(A) # label(one_to_one3) # label(axiom). [assumption].
% 0.73/1.01 9 -one_to_one(A) | function(A) # label(one_to_one1) # label(axiom). [assumption].
% 0.73/1.01 10 -one_to_one(A) | function(inverse(A)) # label(one_to_one2) # label(axiom). [assumption].
% 0.73/1.01 11 -subclass(A,cross_product(universal_class,universal_class)) | -subclass(compose(A,inverse(A)),identity_relation) | function(A) # label(function3) # label(axiom). [assumption].
% 0.73/1.01 12 -function(A) | subclass(A,cross_product(universal_class,universal_class)) # label(function1) # label(axiom). [assumption].
% 0.73/1.01 13 -function(A) | subclass(compose(A,inverse(A)),identity_relation) # label(function2) # label(axiom). [assumption].
% 0.73/1.02 14 -function(A) | -member(B,universal_class) | member(image(A,B),universal_class) # label(replacement) # label(axiom). [assumption].
% 0.73/1.02 Derived: -member(A,universal_class) | member(image(B,A),universal_class) | -subclass(B,cross_product(universal_class,universal_class)) | -subclass(compose(B,inverse(B)),identity_relation). [resolve(14,a,11,c)].
% 0.73/1.02 15 function(choice) # label(choice1) # label(axiom). [assumption].
% 0.73/1.02 Derived: subclass(choice,cross_product(universal_class,universal_class)). [resolve(15,a,12,a)].
% 0.73/1.02 Derived: subclass(compose(choice,inverse(choice)),identity_relation). [resolve(15,a,13,a)].
% 0.73/1.02 Derived: -member(A,universal_class) | member(image(choice,A),universal_class). [resolve(15,a,14,a)].
% 0.73/1.02 16 -operation(A) | function(A) # label(operation1) # label(axiom). [assumption].
% 0.73/1.02 Derived: -operation(A) | subclass(A,cross_product(universal_class,universal_class)). [resolve(16,b,12,a)].
% 0.73/1.02 Derived: -operation(A) | subclass(compose(A,inverse(A)),identity_relation). [resolve(16,b,13,a)].
% 0.73/1.02 Derived: -operation(A) | -member(B,universal_class) | member(image(A,B),universal_class). [resolve(16,b,14,a)].
% 0.73/1.02 17 -function(A) | cross_product(domain_of(domain_of(A)),domain_of(domain_of(A))) != domain_of(A) | -subclass(range_of(A),domain_of(domain_of(A))) | operation(A) # label(operation4) # label(axiom). [assumption].
% 0.73/1.02 Derived: cross_product(domain_of(domain_of(A)),domain_of(domain_of(A))) != domain_of(A) | -subclass(range_of(A),domain_of(domain_of(A))) | operation(A) | -subclass(A,cross_product(universal_class,universal_class)) | -subclass(compose(A,inverse(A)),identity_relation). [resolve(17,a,11,c)].
% 0.73/1.02 Derived: cross_product(domain_of(domain_of(choice)),domain_of(domain_of(choice))) != domain_of(choice) | -subclass(range_of(choice),domain_of(domain_of(choice))) | operation(choice). [resolve(17,a,15,a)].
% 0.73/1.02 18 -compatible(A,B,C) | function(A) # label(compatible1) # label(axiom). [assumption].
% 0.73/1.02 Derived: -compatible(A,B,C) | subclass(A,cross_product(universal_class,universal_class)). [resolve(18,b,12,a)].
% 0.73/1.02 Derived: -compatible(A,B,C) | subclass(compose(A,inverse(A)),identity_relation). [resolve(18,b,13,a)].
% 0.73/1.02 Derived: -compatible(A,B,C) | -member(D,universal_class) | member(image(A,D),universal_class). [resolve(18,b,14,a)].
% 0.73/1.02 Derived: -compatible(A,B,C) | cross_product(domain_of(domain_of(A)),domain_of(domain_of(A))) != domain_of(A) | -subclass(range_of(A),domain_of(domain_of(A))) | operation(A). [resolve(18,b,17,a)].
% 0.73/1.02 19 -function(A) | domain_of(domain_of(B)) != domain_of(A) | -subclass(range_of(A),domain_of(domain_of(C))) | compatible(A,B,C) # label(compatible4) # label(axiom). [assumption].
% 0.73/1.02 Derived: domain_of(domain_of(A)) != domain_of(B) | -subclass(range_of(B),domain_of(domain_of(C))) | compatible(B,A,C) | -subclass(B,cross_product(universal_class,universal_class)) | -subclass(compose(B,inverse(B)),identity_relation). [resolve(19,a,11,c)].
% 0.73/1.02 Derived: domain_of(domain_of(A)) != domain_of(choice) | -subclass(range_of(choice),domain_of(domain_of(B))) | compatible(choice,A,B). [resolve(19,a,15,a)].
% 0.73/1.02 Derived: domain_of(domain_of(A)) != domain_of(B) | -subclass(range_of(B),domain_of(domain_of(C))) | compatible(B,A,C) | -operation(B). [resolve(19,a,16,b)].
% 0.73/1.02 Derived: domain_of(domain_of(A)) != domain_of(B) | -subclass(range_of(B),domain_of(domain_of(C))) | compatible(B,A,C) | -compatible(B,D,E). [resolve(19,a,18,b)].
% 0.73/1.02 20 -maps(A,B,C) | function(A) # label(maps1) # label(axiom). [assumption].
% 0.73/1.02 Derived: -maps(A,B,C) | subclass(A,cross_product(universal_class,universal_class)). [resolve(20,b,12,a)].
% 0.73/1.02 Derived: -maps(A,B,C) | subclass(compose(A,inverse(A)),identity_relation). [resolve(20,b,13,a)].
% 0.73/1.02 Derived: -maps(A,B,C) | -member(D,universal_class) | member(image(A,D),universal_class). [resolve(20,b,14,a)].
% 0.73/1.02 Derived: -maps(A,B,C) | cross_product(domain_of(domain_of(A)),domain_of(domain_of(A))) != domain_of(A) | -subclass(range_of(A),domain_of(domain_of(A))) | operation(A). [resolve(20,b,17,a)].
% 0.73/1.02 Derived: -maps(A,B,C) | domain_of(domain_of(D)) != domain_of(A) | -subclass(range_of(A),domain_of(domain_of(E))) | compatible(A,D,E). [resolve(20,b,19,a)].
% 1.41/1.76 21 -function(A) | -subclass(range_of(A),B) | maps(A,domain_of(A),B) # label(maps4) # label(axiom). [assumption].
% 1.41/1.76 Derived: -subclass(range_of(A),B) | maps(A,domain_of(A),B) | -subclass(A,cross_product(universal_class,universal_class)) | -subclass(compose(A,inverse(A)),identity_relation). [resolve(21,a,11,c)].
% 1.41/1.76 Derived: -subclass(range_of(choice),A) | maps(choice,domain_of(choice),A). [resolve(21,a,15,a)].
% 1.41/1.76 Derived: -subclass(range_of(A),B) | maps(A,domain_of(A),B) | -operation(A). [resolve(21,a,16,b)].
% 1.41/1.76 Derived: -subclass(range_of(A),B) | maps(A,domain_of(A),B) | -compatible(A,C,D). [resolve(21,a,18,b)].
% 1.41/1.76 Derived: -subclass(range_of(A),B) | maps(A,domain_of(A),B) | -maps(A,C,D). [resolve(21,a,20,b)].
% 1.41/1.76 22 -operation(A) | -operation(B) | -compatible(C,A,B) | member(ordered_pair(not_homomorphism1(C,A,B),not_homomorphism2(C,A,B)),domain_of(A)) | homomorphism(C,A,B) # label(homomorphism5) # label(axiom). [assumption].
% 1.41/1.76 23 -homomorphism(A,B,C) | operation(B) # label(homomorphism1) # label(axiom). [assumption].
% 1.41/1.76 24 -homomorphism(A,B,C) | operation(C) # label(homomorphism2) # label(axiom). [assumption].
% 1.41/1.76 25 -homomorphism(A,B,C) | compatible(A,B,C) # label(homomorphism3) # label(axiom). [assumption].
% 1.41/1.76 26 -homomorphism(A,B,C) | -member(ordered_pair(D,E),domain_of(B)) | apply(C,ordered_pair(apply(A,D),apply(A,E))) = apply(A,apply(B,ordered_pair(D,E))) # label(homomorphism4) # label(axiom). [assumption].
% 1.41/1.76 Derived: -operation(A) | -operation(B) | -compatible(C,A,B) | member(ordered_pair(not_homomorphism1(C,A,B),not_homomorphism2(C,A,B)),domain_of(A)) | -member(ordered_pair(D,E),domain_of(A)) | apply(B,ordered_pair(apply(C,D),apply(C,E))) = apply(C,apply(A,ordered_pair(D,E))). [resolve(22,e,26,a)].
% 1.41/1.76 27 -operation(A) | -operation(B) | -compatible(C,A,B) | apply(B,ordered_pair(apply(C,not_homomorphism1(C,A,B)),apply(C,not_homomorphism2(C,A,B)))) != apply(C,apply(A,ordered_pair(not_homomorphism1(C,A,B),not_homomorphism2(C,A,B)))) | homomorphism(C,A,B) # label(homomorphism6) # label(axiom). [assumption].
% 1.41/1.76 Derived: -operation(A) | -operation(B) | -compatible(C,A,B) | apply(B,ordered_pair(apply(C,not_homomorphism1(C,A,B)),apply(C,not_homomorphism2(C,A,B)))) != apply(C,apply(A,ordered_pair(not_homomorphism1(C,A,B),not_homomorphism2(C,A,B)))) | -member(ordered_pair(D,E),domain_of(A)) | apply(B,ordered_pair(apply(C,D),apply(C,E))) = apply(C,apply(A,ordered_pair(D,E))). [resolve(27,e,26,a)].
% 1.41/1.76
% 1.41/1.76 ============================== end predicate elimination =============
% 1.41/1.76
% 1.41/1.76 Auto_denials: (non-Horn, no changes).
% 1.41/1.76
% 1.41/1.76 Term ordering decisions:
% 1.41/1.76 Function symbol KB weights: universal_class=1. choice=1. identity_relation=1. element_relation=1. null_class=1. omega=1. successor_relation=1. application_function=1. composition_function=1. domain_relation=1. subset_relation=1. singleton_relation=1. x=1. y=1. ordered_pair=1. cross_product=1. compose=1. apply=1. intersection=1. image=1. unordered_pair=1. not_subclass_element=1. union=1. symmetric_difference=1. domain_of=1. range_of=1. inverse=1. complement=1. singleton=1. flip=1. compose_class=1. first=1. rotate=1. second=1. successor=1. sum_class=1. diagonalise=1. power_class=1. regular=1. single_valued1=1. single_valued2=1. cantor=1. single_valued3=1. restrict=1. not_homomorphism1=1. not_homomorphism2=1. domain=1. range=1.
% 1.41/1.76
% 1.41/1.76 ============================== end of process initial clauses ========
% 1.41/1.76
% 1.41/1.76 ============================== CLAUSES FOR SEARCH ====================
% 1.41/1.76
% 1.41/1.76 ============================== end of clauses for search =============
% 1.41/1.76
% 1.41/1.76 ============================== SEARCH ================================
% 1.41/1.76
% 1.41/1.76 % Starting search at 0.04 seconds.
% 1.41/1.76
% 1.41/1.76 NOTE: Back_subsumption disabled, ratio of kept to back_subsumed is 46 (0.00 of 0.65 sec).
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=49.000, iters=3384
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=40.000, iters=3363
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=29.000, iters=3370
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=25.000, iters=3343
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=24.000, iters=3427
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=23.000, iters=3400
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=22.000, iters=3347
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=20.000, iters=3491
% 1.41/1.76
% 1.41/1.76 Low Water (keep): wt=19.000, iters=3335
% 4.95/5.23
% 4.95/5.23 Low Water (keep): wt=17.000, iters=3341
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=3671, wt=189.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=2754, wt=175.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=2723, wt=171.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=2720, wt=155.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=12981, wt=15.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=12991, wt=13.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=13053, wt=12.000
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=13055, wt=11.000
% 4.95/5.23
% 4.95/5.23 Low Water (keep): wt=16.000, iters=3339
% 4.95/5.23
% 4.95/5.23 Low Water (keep): wt=15.000, iters=3358
% 4.95/5.23
% 4.95/5.23 Low Water (displace): id=21170, wt=10.000
% 4.95/5.23
% 4.95/5.23 Low Water (keep): wt=13.000, iters=4685
% 4.95/5.23
% 4.95/5.23 ============================== PROOF =================================
% 4.95/5.23 % SZS status Unsatisfiable
% 4.95/5.23 % SZS output start Refutation
% 4.95/5.23
% 4.95/5.23 % Proof 1 at 4.05 (+ 0.18) seconds.
% 4.95/5.23 % Length of proof is 28.
% 4.95/5.23 % Level of proof is 8.
% 4.95/5.23 % Maximum clause weight is 17.000.
% 4.95/5.23 % Given clauses 3028.
% 4.95/5.23
% 4.95/5.23 28 -subclass(A,B) | -member(C,A) | member(C,B) # label(subclass_members) # label(axiom). [assumption].
% 4.95/5.23 31 subclass(A,universal_class) # label(class_elements_are_sets) # label(axiom). [assumption].
% 4.95/5.23 35 -member(A,unordered_pair(B,C)) | A = B | A = C # label(unordered_pair_member) # label(axiom). [assumption].
% 4.95/5.23 39 unordered_pair(A,A) = singleton(A) # label(singleton_set) # label(axiom). [assumption].
% 4.95/5.23 40 singleton(A) = unordered_pair(A,A). [copy(39),flip(a)].
% 4.95/5.23 41 unordered_pair(singleton(A),unordered_pair(A,singleton(B))) = ordered_pair(A,B) # label(ordered_pair) # label(axiom). [assumption].
% 4.95/5.23 42 ordered_pair(A,B) = unordered_pair(unordered_pair(A,A),unordered_pair(A,unordered_pair(B,B))). [copy(41),rewrite([40(1),40(2)]),flip(a)].
% 4.95/5.23 52 -member(ordered_pair(A,B),element_relation) | member(A,B) # label(element_relation2) # label(axiom). [assumption].
% 4.95/5.23 53 -member(unordered_pair(unordered_pair(A,A),unordered_pair(A,unordered_pair(B,B))),element_relation) | member(A,B). [copy(52),rewrite([42(1)])].
% 4.95/5.23 57 -member(A,intersection(B,C)) | member(A,C) # label(intersection2) # label(axiom). [assumption].
% 4.95/5.23 114 A = null_class | member(regular(A),A) # label(regularity1) # label(axiom). [assumption].
% 4.95/5.23 115 null_class = A | member(regular(A),A). [copy(114),flip(a)].
% 4.95/5.23 157 intersection(complement(compose(element_relation,complement(identity_relation))),element_relation) = singleton_relation # label(compose_can_define_singleton) # label(axiom). [assumption].
% 4.95/5.23 168 member(ordered_pair(x,y),singleton_relation) # label(prove_compose_condition_for_singleton_membership1_1) # label(negated_conjecture). [assumption].
% 4.95/5.23 169 member(unordered_pair(unordered_pair(x,x),unordered_pair(x,unordered_pair(y,y))),singleton_relation). [copy(168),rewrite([42(3)])].
% 4.95/5.23 170 -member(x,universal_class) # label(prove_compose_condition_for_singleton_membership1_2) # label(negated_conjecture). [assumption].
% 4.95/5.23 239 -member(A,B) | member(A,universal_class). [resolve(31,a,28,a)].
% 4.95/5.23 297 unordered_pair(A,B) = null_class | regular(unordered_pair(A,B)) = A | regular(unordered_pair(A,B)) = B. [resolve(115,b,35,a),flip(a)].
% 4.95/5.23 298 unordered_pair(A,A) = null_class | regular(unordered_pair(A,A)) = A. [factor(297,b,c)].
% 4.95/5.23 323 -member(A,singleton_relation) | member(A,element_relation). [para(157(a,1),57(a,2))].
% 4.95/5.23 399 member(regular(A),universal_class) | null_class = A. [resolve(239,a,115,b)].
% 4.95/5.23 453 member(unordered_pair(unordered_pair(x,x),unordered_pair(x,unordered_pair(y,y))),element_relation). [resolve(323,a,169,a)].
% 4.95/5.23 3363 unordered_pair(A,A) = null_class | member(A,universal_class). [para(298(b,1),399(a,1)),flip(c),merge(c)].
% 4.95/5.23 3380 unordered_pair(x,x) = null_class. [resolve(3363,b,170,a)].
% 4.95/5.23 3401 member(unordered_pair(null_class,unordered_pair(x,unordered_pair(y,y))),element_relation). [back_rewrite(453),rewrite([3380(3)])].
% 4.95/5.23 3414 -member(unordered_pair(null_class,unordered_pair(x,unordered_pair(A,A))),element_relation) | member(x,A). [para(3380(a,1),53(a,1,1))].
% 4.95/5.23 29504 member(x,y). [resolve(3414,a,3401,a)].
% 4.95/5.23 29527 $F. [resolve(29504,a,239,a),unit_del(a,170)].
% 4.95/5.23
% 4.95/5.23 % SZS output end Refutation
% 4.95/5.23 ============================== end of proof ==========================
% 4.95/5.23
% 4.95/5.23 ============================== STATISTICS ============================
% 4.95/5.23
% 4.95/5.23 Given=3028. Generated=350176. Kept=29416. proofs=1.
% 4.95/5.23 Usable=2524. Sos=9488. Demods=55. Limbo=20, Disabled=17531. Hints=0.
% 4.95/5.23 Megabytes=22.72.
% 4.95/5.23 User_CPU=4.05, System_CPU=0.18, Wall_clock=5.
% 4.95/5.23
% 4.95/5.23 ============================== end of statistics =====================
% 4.95/5.23
% 4.95/5.23 ============================== end of search =========================
% 4.95/5.23
% 4.95/5.23 THEOREM PROVED
% 4.95/5.23 % SZS status Unsatisfiable
% 4.95/5.23
% 4.95/5.23 Exiting with 1 proof.
% 4.95/5.23
% 4.95/5.23 Process 22275 exit (max_proofs) Sat Jul 9 23:04:16 2022
% 4.95/5.23 Prover9 interrupted
%------------------------------------------------------------------------------