Theorem isoeq5 5487

Description: Equality theorem for isomorphisms. (Contributed by set.mm contributors, 17-May-2004.)

Assertion

Ref	Expression
isoeq5	|- (B = C -> (H Isom R, S (A, B) <-> H Isom R, S (A, C)))

Proof of Theorem isoeq5

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		f1oeq3 5284	. . 3 |- (B = C -> (H:A-1-1-onto->B <-> H:A-1-1-onto->C))
2	1	anbi1d 685	. 2 |- (B = C -> ((H:A-1-1-onto->B /\ A.x e. A A.y e. A (xRy <-> (H` x)S(H` y))) <-> (H:A-1-1-onto->C /\ A.x e. A A.y e. A (xRy <-> (H` x)S(H` y)))))
3		df-iso 4797	. 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))))
4		df-iso 4797	. 2 |- (H Isom R, S (A, C) <-> (H:A-1-1-onto->C /\ A.x e. A A.y e. A (xRy <-> (H` x)S(H` y))))
5	2, 3, 4	3bitr4g 279	1 |- (B = C -> (H Isom R, S (A, B) <-> H Isom R, S (A, C)))

Syntax hints:   -> wi 4   <-> wb 176   /\ wa 358   = wceq 1642  A.wral 2615   class class class wbr 4640  -1-1-onto->wf1o 4781  ` cfv 4782   Isom wiso 4783

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-v 2862  df-nin 3212  df-compl 3213  df-in 3214  df-ss 3260  df-f 4792  df-f1 4793  df-fo 4794  df-f1o 4795  df-iso 4797

This theorem is referenced by: (None)