let Y be non empty set ; :: thesis: for G being Subset of (PARTITIONS Y)
for A, B, C, D, E, F, J, M being a_partition of Y
for z, u being Element of Y st G is independent & G = {A,B,C,D,E,F,J,M} & A <> B & A <> C & A <> D & A <> E & A <> F & A <> J & A <> M & B <> C & B <> D & B <> E & B <> F & B <> J & B <> M & C <> D & C <> E & C <> F & C <> J & C <> M & D <> E & D <> F & D <> J & D <> M & E <> F & E <> J & E <> M & F <> J & F <> M & J <> M holds
(EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M)) /\ (EqClass z,A) <> {}
let G be Subset of (PARTITIONS Y); :: thesis: for A, B, C, D, E, F, J, M being a_partition of Y
for z, u being Element of Y st G is independent & G = {A,B,C,D,E,F,J,M} & A <> B & A <> C & A <> D & A <> E & A <> F & A <> J & A <> M & B <> C & B <> D & B <> E & B <> F & B <> J & B <> M & C <> D & C <> E & C <> F & C <> J & C <> M & D <> E & D <> F & D <> J & D <> M & E <> F & E <> J & E <> M & F <> J & F <> M & J <> M holds
(EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M)) /\ (EqClass z,A) <> {}
let A, B, C, D, E, F, J, M be a_partition of Y; :: thesis: for z, u being Element of Y st G is independent & G = {A,B,C,D,E,F,J,M} & A <> B & A <> C & A <> D & A <> E & A <> F & A <> J & A <> M & B <> C & B <> D & B <> E & B <> F & B <> J & B <> M & C <> D & C <> E & C <> F & C <> J & C <> M & D <> E & D <> F & D <> J & D <> M & E <> F & E <> J & E <> M & F <> J & F <> M & J <> M holds
(EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M)) /\ (EqClass z,A) <> {}
let z, u be Element of Y; :: thesis: ( G is independent & G = {A,B,C,D,E,F,J,M} & A <> B & A <> C & A <> D & A <> E & A <> F & A <> J & A <> M & B <> C & B <> D & B <> E & B <> F & B <> J & B <> M & C <> D & C <> E & C <> F & C <> J & C <> M & D <> E & D <> F & D <> J & D <> M & E <> F & E <> J & E <> M & F <> J & F <> M & J <> M implies (EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M)) /\ (EqClass z,A) <> {} )
assume that
A1: G is independent and
A2: G = {A,B,C,D,E,F,J,M} and
A3: ( A <> B & A <> C & A <> D & A <> E & A <> F & A <> J ) and
A4: A <> M and
A5: ( B <> C & B <> D & B <> E & B <> F & B <> J & B <> M & C <> D & C <> E & C <> F & C <> J & C <> M & D <> E & D <> F & D <> J & D <> M & E <> F & E <> J & E <> M & F <> J & F <> M & J <> M ) ; :: thesis: (EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M)) /\ (EqClass z,A) <> {}
set h = (((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A));
A6: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . B = EqClass u,B by A3, A5, Th65;
reconsider GG = EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M) as set ;
reconsider I = EqClass z,A as set ;
GG = (EqClass u,(((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J)) /\ (EqClass u,M) by Th1;
then GG = ((EqClass u,((((B '/\' C) '/\' D) '/\' E) '/\' F)) /\ (EqClass u,J)) /\ (EqClass u,M) by Th1;
then GG = (((EqClass u,(((B '/\' C) '/\' D) '/\' E)) /\ (EqClass u,F)) /\ (EqClass u,J)) /\ (EqClass u,M) by Th1;
then GG = ((((EqClass u,((B '/\' C) '/\' D)) /\ (EqClass u,E)) /\ (EqClass u,F)) /\ (EqClass u,J)) /\ (EqClass u,M) by Th1;
then GG = (((((EqClass u,(B '/\' C)) /\ (EqClass u,D)) /\ (EqClass u,E)) /\ (EqClass u,F)) /\ (EqClass u,J)) /\ (EqClass u,M) by Th1;
then A7: GG /\ I = (((((((EqClass u,B) /\ (EqClass u,C)) /\ (EqClass u,D)) /\ (EqClass u,E)) /\ (EqClass u,F)) /\ (EqClass u,J)) /\ (EqClass u,M)) /\ (EqClass z,A) by Th1;
A8: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . A = EqClass z,A by FUNCT_7:96;
A9: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . C = EqClass u,C by A3, A5, Th65;
A10: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . M = EqClass u,M by A4, Lm2;
A11: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . J = EqClass u,J by A3, A5, Th65;
A12: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . F = EqClass u,F by A3, A5, Th65;
A13: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . E = EqClass u,E by A3, A5, Th65;
A14: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . D = EqClass u,D by A3, A5, Th65;
A15: rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) = {(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . A),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . B),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . C),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . D),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . E),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . F),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . J),(((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . M)} by Th67;
rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) c= bool Y

proof

let t be set ; :: according to TARSKI:def 3 :: thesis: ( not t in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) or t in bool Y )
assume t in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) ; :: thesis: t in bool Y
then ( t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . A or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . B or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . C or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . D or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . E or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . F or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . J or t = ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . M ) by A15, ENUMSET1:def 6;
hence t in bool Y by A8, A6, A9, A14, A13, A12, A11, A10; :: thesis: verum

end;

then reconsider FF = rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) as Subset-Family of Y ;
A16: dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) = G by A2, Th66;
then A in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, ENUMSET1:def 6;
then A17: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . A in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then A18: Intersect FF = meet (rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A)))) by SETFAM_1:def 10;
for d being set st d in G holds
((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . d in d

proof

let d be set ; :: thesis: ( d in G implies ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . d in d )
assume d in G ; :: thesis: ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . d in d
then ( d = A or d = B or d = C or d = D or d = E or d = F or d = J or d = M ) by A2, ENUMSET1:def 6;
hence ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . d in d by A8, A6, A9, A14, A13, A12, A11, A10; :: thesis: verum

end;

then Intersect FF <> {} by A1, A16, BVFUNC_2:def 5;
then consider m being set such that
A19: m in Intersect FF by XBOOLE_0:def 1;
C in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . C in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then A20: m in EqClass u,C by A9, A18, A19, SETFAM_1:def 1;
B in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . B in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then m in EqClass u,B by A6, A18, A19, SETFAM_1:def 1;
then A21: m in (EqClass u,B) /\ (EqClass u,C) by A20, XBOOLE_0:def 4;
D in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . D in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then m in EqClass u,D by A14, A18, A19, SETFAM_1:def 1;
then A22: m in ((EqClass u,B) /\ (EqClass u,C)) /\ (EqClass u,D) by A21, XBOOLE_0:def 4;
E in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . E in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then m in EqClass u,E by A13, A18, A19, SETFAM_1:def 1;
then A23: m in (((EqClass u,B) /\ (EqClass u,C)) /\ (EqClass u,D)) /\ (EqClass u,E) by A22, XBOOLE_0:def 4;
F in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . F in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then m in EqClass u,F by A12, A18, A19, SETFAM_1:def 1;
then A24: m in ((((EqClass u,B) /\ (EqClass u,C)) /\ (EqClass u,D)) /\ (EqClass u,E)) /\ (EqClass u,F) by A23, XBOOLE_0:def 4;
J in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . J in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then m in EqClass u,J by A11, A18, A19, SETFAM_1:def 1;
then A25: m in (((((EqClass u,B) /\ (EqClass u,C)) /\ (EqClass u,D)) /\ (EqClass u,E)) /\ (EqClass u,F)) /\ (EqClass u,J) by A24, XBOOLE_0:def 4;
M in dom ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by A2, A16, ENUMSET1:def 6;
then ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) . M in rng ((((((((B .--> (EqClass u,B)) +* (C .--> (EqClass u,C))) +* (D .--> (EqClass u,D))) +* (E .--> (EqClass u,E))) +* (F .--> (EqClass u,F))) +* (J .--> (EqClass u,J))) +* (M .--> (EqClass u,M))) +* (A .--> (EqClass z,A))) by FUNCT_1:def 5;
then m in EqClass u,M by A10, A18, A19, SETFAM_1:def 1;
then A26: m in ((((((EqClass u,B) /\ (EqClass u,C)) /\ (EqClass u,D)) /\ (EqClass u,E)) /\ (EqClass u,F)) /\ (EqClass u,J)) /\ (EqClass u,M) by A25, XBOOLE_0:def 4;
m in EqClass z,A by A8, A17, A18, A19, SETFAM_1:def 1;
hence (EqClass u,((((((B '/\' C) '/\' D) '/\' E) '/\' F) '/\' J) '/\' M)) /\ (EqClass z,A) <> {} by A7, A26, XBOOLE_0:def 4; :: thesis: verum