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Theorem isoeq1 2925
Description: Equality theorem for isomorphisms.
Assertion
Ref Expression
isoeq1 |- (H = G -> (H Isom R, S (A, B) <-> G Isom R, S (A, B)))

Proof of Theorem isoeq1
StepHypRef Expression
1 f1oeq1 2795 . . 3 |- (H = G -> (H:A-1-1-onto->B <-> G:A-1-1-onto->B))
2 fveq1 2831 . . . . . . 7 |- (H = G -> (H` x) = (G` x))
3 fveq1 2831 . . . . . . 7 |- (H = G -> (H` y) = (G` y))
42, 3breq12d 2073 . . . . . 6 |- (H = G -> ((H` x)S(H` y) <-> (G` x)S(G` y)))
54bibi2d 470 . . . . 5 |- (H = G -> ((xRy <-> (H` x)S(H` y)) <-> (xRy <-> (G` x)S(G` y))))
65biraldv 1219 . . . 4 |- (H = G -> (A.y e. A (xRy <-> (H` x)S(H` y)) <-> A.y e. A (xRy <-> (G` x)S(G` y))))
76biraldv 1219 . . 3 |- (H = G -> (A.x e. A A.y e. A (xRy <-> (H` x)S(H` y)) <-> A.x e. A A.y e. A (xRy <-> (G` x)S(G` y))))
81, 7anbi12d 476 . 2 |- (H = G -> ((H:A-1-1-onto->B /\ A.x e. A A.y e. A (xRy <-> (H` x)S(H` y))) <-> (G:A-1-1-onto->B /\ A.x e. A A.y e. A (xRy <-> (G` x)S(G` y)))))
9 df-iso 2439 . 2 |- (H Isom R, S (A, B) <-> (H:A-1-1-onto->B /\ A.x e. A A.y e. A (xRy <-> (H` x)S(H` y))))
10 df-iso 2439 . 2 |- (G Isom R, S (A, B) <-> (G:A-1-1-onto->B /\ A.x e. A A.y e. A (xRy <-> (G` x)S(G` y))))
118, 9, 103bitr4g 428 1 |- (H = G -> (H Isom R, S (A, B) <-> G Isom R, S (A, B)))
Colors of variables: wff set class
Syntax hints:   -> wi 2   <-> wb 127   /\ wa 196   = wceq 1091  A.wral 1201   class class class wbr 2054  -1-1-onto->wf1o 2421  ` cfv 2422   Isom wiso 2423
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-ral 1205  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-br 2063  df-opab 2098  df-id 2125  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fn 2433  df-f 2434  df-f1 2435  df-fo 2436  df-f1o 2437  df-fv 2438  df-iso 2439
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