%------------------------------------------------------------------------------
% File : Z3---4.15.1
% Problem : SET590+3 : TPTP v9.0.0. Released v2.2.0.
% Transfm : none
% Format : tptp
% Command : run_E %s %d THM
% Computer : n008.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 : Sat Jun 21 05:25:55 AM UTC 2025
% Result : Theorem 0.12s 0.37s
% Output : Proof 0.12s
% Verified :
% SZS Type : -
% Comments :
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.10/0.12 % Problem : SET590+3 : TPTP v9.0.0. Released v2.2.0.
% 0.10/0.12 % Command : run_E %s %d THM
% 0.12/0.34 % Computer : n008.cluster.edu
% 0.12/0.34 % Model : x86_64 x86_64
% 0.12/0.34 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.34 % Memory : 8042.1875MB
% 0.12/0.34 % OS : Linux 3.10.0-693.el7.x86_64
% 0.12/0.34 % CPULimit : 300
% 0.12/0.34 % WCLimit : 300
% 0.12/0.34 % DateTime : Fri Jun 20 05:29:48 EDT 2025
% 0.12/0.34 % CPUTime :
% 0.12/0.37 % SZS status Theorem
% 0.12/0.37 % SZS output start Proof
% 0.12/0.37 tff(member_type, type, (
% 0.12/0.37 member: ( $i * $i ) > $o)).
% 0.12/0.37 tff(difference_type, type, (
% 0.12/0.37 difference: ( $i * $i ) > $i)).
% 0.12/0.37 tff(tptp_fun_C_1_type, type, (
% 0.12/0.37 tptp_fun_C_1: $i)).
% 0.12/0.37 tff(tptp_fun_B_2_type, type, (
% 0.12/0.37 tptp_fun_B_2: $i)).
% 0.12/0.37 tff(tptp_fun_D_0_type, type, (
% 0.12/0.37 tptp_fun_D_0: ( $i * $i ) > $i)).
% 0.12/0.37 tff(subset_type, type, (
% 0.12/0.37 subset: ( $i * $i ) > $o)).
% 0.12/0.37 tff(1,plain,
% 0.12/0.37 (^[B: $i, C: $i] : refl((~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))) <=> (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))))),
% 0.12/0.37 inference(bind,[status(th)],[])).
% 0.12/0.37 tff(2,plain,
% 0.12/0.37 (![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))) <=> ![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))),
% 0.12/0.37 inference(quant_intro,[status(thm)],[1])).
% 0.12/0.37 tff(3,plain,
% 0.12/0.37 (^[B: $i, C: $i] : rewrite((~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))) <=> (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))))),
% 0.12/0.37 inference(bind,[status(th)],[])).
% 0.12/0.37 tff(4,plain,
% 0.12/0.37 (![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))) <=> ![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))),
% 0.12/0.37 inference(quant_intro,[status(thm)],[3])).
% 0.12/0.37 tff(5,plain,
% 0.12/0.37 (![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))) <=> ![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))),
% 0.12/0.37 inference(transitivity,[status(thm)],[4, 2])).
% 0.12/0.37 tff(6,plain,
% 0.12/0.37 (^[B: $i, C: $i] : trans(monotonicity(rewrite(((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) <=> ((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))), rewrite((subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))) <=> (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))), ((((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) & (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))) <=> (((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) & (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))))), rewrite((((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) & (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))) <=> (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))), ((((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) & (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))) <=> (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))))),
% 0.12/0.37 inference(bind,[status(th)],[])).
% 0.12/0.37 tff(7,plain,
% 0.12/0.37 (![B: $i, C: $i] : (((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) & (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C))))) <=> ![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))),
% 0.12/0.38 inference(quant_intro,[status(thm)],[6])).
% 0.12/0.38 tff(8,plain,
% 0.12/0.38 (![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : ((~member(D, B)) | member(D, C))) <=> ![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : ((~member(D, B)) | member(D, C)))),
% 0.12/0.38 inference(rewrite,[status(thm)],[])).
% 0.12/0.38 tff(9,plain,
% 0.12/0.38 (^[B: $i, C: $i] : rewrite((subset(B, C) <=> ![D: $i] : (member(D, B) => member(D, C))) <=> (subset(B, C) <=> ![D: $i] : ((~member(D, B)) | member(D, C))))),
% 0.12/0.38 inference(bind,[status(th)],[])).
% 0.12/0.38 tff(10,plain,
% 0.12/0.38 (![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : (member(D, B) => member(D, C))) <=> ![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : ((~member(D, B)) | member(D, C)))),
% 0.12/0.38 inference(quant_intro,[status(thm)],[9])).
% 0.12/0.38 tff(11,axiom,(![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : (member(D, B) => member(D, C)))), file('/export/starexec/sandbox/benchmark/theBenchmark.p','subset_defn')).
% 0.12/0.38 tff(12,plain,
% 0.12/0.38 (![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : ((~member(D, B)) | member(D, C)))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[11, 10])).
% 0.12/0.38 tff(13,plain,
% 0.12/0.38 (![B: $i, C: $i] : (subset(B, C) <=> ![D: $i] : ((~member(D, B)) | member(D, C)))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[12, 8])).
% 0.12/0.38 tff(14,plain,(
% 0.12/0.38 ![B: $i, C: $i] : (((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C))) & (subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))),
% 0.12/0.38 inference(skolemize,[status(sab)],[13])).
% 0.12/0.38 tff(15,plain,
% 0.12/0.38 (![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[14, 7])).
% 0.12/0.38 tff(16,plain,
% 0.12/0.38 (![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[15, 5])).
% 0.12/0.38 tff(17,plain,
% 0.12/0.38 ((~![B: $i, C: $i] : (~((~((~subset(B, C)) | ![D: $i] : ((~member(D, B)) | member(D, C)))) | (~(subset(B, C) | (~((~member(tptp_fun_D_0(C, B), B)) | member(tptp_fun_D_0(C, B), C)))))))) | (~((~((~subset(difference(B!2, C!1), B!2)) | ![D: $i] : ((~member(D, difference(B!2, C!1))) | member(D, B!2)))) | (~(subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)))))))),
% 0.12/0.38 inference(quant_inst,[status(thm)],[])).
% 0.12/0.38 tff(18,plain,
% 0.12/0.38 (~((~((~subset(difference(B!2, C!1), B!2)) | ![D: $i] : ((~member(D, difference(B!2, C!1))) | member(D, B!2)))) | (~(subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2))))))),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[17, 16])).
% 0.12/0.38 tff(19,plain,
% 0.12/0.38 (((~((~subset(difference(B!2, C!1), B!2)) | ![D: $i] : ((~member(D, difference(B!2, C!1))) | member(D, B!2)))) | (~(subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)))))) | (subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2))))),
% 0.12/0.38 inference(tautology,[status(thm)],[])).
% 0.12/0.38 tff(20,plain,
% 0.12/0.38 (subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)))),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[19, 18])).
% 0.12/0.38 tff(21,plain,
% 0.12/0.38 ((~![B: $i, C: $i] : subset(difference(B, C), B)) <=> (~![B: $i, C: $i] : subset(difference(B, C), B))),
% 0.12/0.38 inference(rewrite,[status(thm)],[])).
% 0.12/0.38 tff(22,axiom,(~![B: $i, C: $i] : subset(difference(B, C), B)), file('/export/starexec/sandbox/benchmark/theBenchmark.p','prove_th49')).
% 0.12/0.38 tff(23,plain,
% 0.12/0.38 (~![B: $i, C: $i] : subset(difference(B, C), B)),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[22, 21])).
% 0.12/0.38 tff(24,plain,
% 0.12/0.38 (~![B: $i, C: $i] : subset(difference(B, C), B)),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[23, 21])).
% 0.12/0.38 tff(25,plain,
% 0.12/0.38 (~![B: $i, C: $i] : subset(difference(B, C), B)),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[24, 21])).
% 0.12/0.38 tff(26,plain,
% 0.12/0.38 (~![B: $i, C: $i] : subset(difference(B, C), B)),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[25, 21])).
% 0.12/0.38 tff(27,plain,(
% 0.12/0.38 ~subset(difference(B!2, C!1), B!2)),
% 0.12/0.38 inference(skolemize,[status(sab)],[26])).
% 0.12/0.38 tff(28,plain,
% 0.12/0.38 ((~(subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2))))) | subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)))),
% 0.12/0.38 inference(tautology,[status(thm)],[])).
% 0.12/0.38 tff(29,plain,
% 0.12/0.38 ((~(subset(difference(B!2, C!1), B!2) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2))))) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)))),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[28, 27])).
% 0.12/0.38 tff(30,plain,
% 0.12/0.38 (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2))),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[29, 20])).
% 0.12/0.38 tff(31,plain,
% 0.12/0.38 (((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | (~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2))),
% 0.12/0.38 inference(tautology,[status(thm)],[])).
% 0.12/0.38 tff(32,plain,
% 0.12/0.38 (~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[31, 30])).
% 0.12/0.38 tff(33,plain,
% 0.12/0.38 (((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), C!1)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)),
% 0.12/0.38 inference(tautology,[status(thm)],[])).
% 0.12/0.38 tff(34,plain,
% 0.12/0.38 ((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), C!1)),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[33, 32])).
% 0.12/0.38 tff(35,plain,
% 0.12/0.38 (((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))),
% 0.12/0.38 inference(tautology,[status(thm)],[])).
% 0.12/0.38 tff(36,plain,
% 0.12/0.38 (member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[35, 30])).
% 0.12/0.38 tff(37,plain,
% 0.12/0.38 ((((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), C!1)) <=> member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))) | (~((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), C!1))) | (~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1)))),
% 0.12/0.38 inference(tautology,[status(thm)],[])).
% 0.12/0.38 tff(38,plain,
% 0.12/0.38 (((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), C!1)) <=> member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[37, 36, 34])).
% 0.12/0.38 tff(39,plain,
% 0.12/0.38 (^[B: $i, C: $i, D: $i] : refl((~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C)))) <=> (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C)))))),
% 0.12/0.38 inference(bind,[status(th)],[])).
% 0.12/0.38 tff(40,plain,
% 0.12/0.38 (![B: $i, C: $i, D: $i] : (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C)))) <=> ![B: $i, C: $i, D: $i] : (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))),
% 0.12/0.38 inference(quant_intro,[status(thm)],[39])).
% 0.12/0.38 tff(41,plain,
% 0.12/0.38 (^[B: $i, C: $i, D: $i] : trans(trans(monotonicity(rewrite((member(D, B) & (~member(D, C))) <=> (~((~member(D, B)) | member(D, C)))), ((member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C)))) <=> (member(D, difference(B, C)) <=> (~((~member(D, B)) | member(D, C)))))), rewrite((member(D, difference(B, C)) <=> (~((~member(D, B)) | member(D, C)))) <=> (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))), ((member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C)))) <=> (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C)))))), rewrite((~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C)))) <=> (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))), ((member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C)))) <=> (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))))),
% 0.12/0.38 inference(bind,[status(th)],[])).
% 0.12/0.38 tff(42,plain,
% 0.12/0.38 (![B: $i, C: $i, D: $i] : (member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C)))) <=> ![B: $i, C: $i, D: $i] : (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))),
% 0.12/0.38 inference(quant_intro,[status(thm)],[41])).
% 0.12/0.38 tff(43,plain,
% 0.12/0.38 (![B: $i, C: $i, D: $i] : (member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C)))) <=> ![B: $i, C: $i, D: $i] : (member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C))))),
% 0.12/0.38 inference(rewrite,[status(thm)],[])).
% 0.12/0.38 tff(44,axiom,(![B: $i, C: $i, D: $i] : (member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C))))), file('/export/starexec/sandbox/benchmark/theBenchmark.p','difference_defn')).
% 0.12/0.38 tff(45,plain,
% 0.12/0.38 (![B: $i, C: $i, D: $i] : (member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C))))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[44, 43])).
% 0.12/0.38 tff(46,plain,(
% 0.12/0.38 ![B: $i, C: $i, D: $i] : (member(D, difference(B, C)) <=> (member(D, B) & (~member(D, C))))),
% 0.12/0.38 inference(skolemize,[status(sab)],[45])).
% 0.12/0.38 tff(47,plain,
% 0.12/0.38 (![B: $i, C: $i, D: $i] : (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[46, 42])).
% 0.12/0.38 tff(48,plain,
% 0.12/0.38 (![B: $i, C: $i, D: $i] : (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))),
% 0.12/0.38 inference(modus_ponens,[status(thm)],[47, 40])).
% 0.12/0.38 tff(49,plain,
% 0.12/0.38 ((~![B: $i, C: $i, D: $i] : (~(((~member(D, B)) | member(D, C)) <=> member(D, difference(B, C))))) | (~(((~member(tptp_fun_D_0(B!2, difference(B!2, C!1)), B!2)) | member(tptp_fun_D_0(B!2, difference(B!2, C!1)), C!1)) <=> member(tptp_fun_D_0(B!2, difference(B!2, C!1)), difference(B!2, C!1))))),
% 0.12/0.38 inference(quant_inst,[status(thm)],[])).
% 0.12/0.38 tff(50,plain,
% 0.12/0.38 ($false),
% 0.12/0.38 inference(unit_resolution,[status(thm)],[49, 48, 38])).
% 0.12/0.38 % SZS output end Proof
% 0.12/0.38 % E exiting
%------------------------------------------------------------------------------