Theorem isocnv2 6240

Description: Converse law for isomorphism. (Contributed by Mario Carneiro, 30-Jan-2014.)

Assertion

Ref	Expression
isocnv2	|- ( H Isom R , S ( A , B ) <-> H Isom `' R , `' S ( A , B ) )

Proof of Theorem isocnv2

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

Step	Hyp	Ref	Expression
1		ralcom 2937	. . . 4 |- ( A. y e. A A. x e. A ( y R x <-> ( H ` y ) S ( H ` x ) ) <-> A. x e. A A. y e. A ( y R x <-> ( H ` y ) S ( H ` x ) ) )
2		vex 3034	. . . . . . 7 |- x e. _V
3		vex 3034	. . . . . . 7 |- y e. _V
4	2, 3	brcnv 5022	. . . . . 6 |- ( x `' R y <-> y R x )
5		fvex 5889	. . . . . . 7 |- ( H ` x ) e. _V
6		fvex 5889	. . . . . . 7 |- ( H ` y ) e. _V
7	5, 6	brcnv 5022	. . . . . 6 |- ( ( H ` x ) `' S ( H ` y ) <-> ( H ` y ) S ( H ` x ) )
8	4, 7	bibi12i 322	. . . . 5 |- ( ( x `' R y <-> ( H ` x ) `' S ( H ` y ) ) <-> ( y R x <-> ( H ` y ) S ( H ` x ) ) )
9	8	2ralbii 2824	. . . 4 |- ( A. x e. A A. y e. A ( x `' R y <-> ( H ` x ) `' S ( H ` y ) ) <-> A. x e. A A. y e. A ( y R x <-> ( H ` y ) S ( H ` x ) ) )
10	1, 9	bitr4i 260	. . 3 |- ( A. y e. A A. x e. A ( y R x <-> ( H ` y ) S ( H ` x ) ) <-> A. x e. A A. y e. A ( x `' R y <-> ( H ` x ) `' S ( H ` y ) ) )
11	10	anbi2i 708	. 2 |- ( ( H : A -1-1-onto-> B /\ A. y e. A A. x e. A ( y R x <-> ( H ` y ) S ( H ` x ) ) ) <-> ( H : A -1-1-onto-> B /\ A. x e. A A. y e. A ( x `' R y <-> ( H ` x ) `' S ( H ` y ) ) ) )
12		df-isom 5598	. 2 |- ( H Isom R , S ( A , B ) <-> ( H : A -1-1-onto-> B /\ A. y e. A A. x e. A ( y R x <-> ( H ` y ) S ( H ` x ) ) ) )
13		df-isom 5598	. 2 |- ( H Isom `' R , `' S ( A , B ) <-> ( H : A -1-1-onto-> B /\ A. x e. A A. y e. A ( x `' R y <-> ( H ` x ) `' S ( H ` y ) ) ) )
14	11, 12, 13	3bitr4i 285	1 |- ( H Isom R , S ( A , B ) <-> H Isom `' R , `' S ( A , B ) )

Syntax hints:   <-> wb 189   /\ wa 376   A.wral 2756   class class class wbr 4395   `'ccnv 4838   -1-1-onto->wf1o 5588   ` cfv 5589   Isom wiso 5590

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1677  ax-4 1690  ax-5 1766  ax-6 1813  ax-7 1859  ax-9 1913  ax-10 1932  ax-11 1937  ax-12 1950  ax-13 2104  ax-ext 2451  ax-sep 4518  ax-nul 4527  ax-pr 4639

This theorem depends on definitions:  df-bi 190  df-or 377  df-an 378  df-3an 1009  df-tru 1455  df-ex 1672  df-nf 1676  df-sb 1806  df-eu 2323  df-mo 2324  df-clab 2458  df-cleq 2464  df-clel 2467  df-nfc 2601  df-ne 2643  df-ral 2761  df-rex 2762  df-rab 2765  df-v 3033  df-sbc 3256  df-dif 3393  df-un 3395  df-in 3397  df-ss 3404  df-nul 3723  df-if 3873  df-sn 3960  df-pr 3962  df-op 3966  df-uni 4191  df-br 4396  df-opab 4455  df-cnv 4847  df-iota 5553  df-fv 5597  df-isom 5598

This theorem is referenced by:  infiso  8041  wofib  8078  leiso  12663  gtiso  28356