Theorem cbvrab 2914

Description: Rule to change the bound variable in a restricted class abstraction, using implicit substitution. This version has bound-variable hypotheses in place of distinct variable conditions. (Contributed by Andrew Salmon, 11-Jul-2011.) (Revised by Mario Carneiro, 9-Oct-2016.)

Hypotheses

Ref	Expression
cbvrab.1	|- F/_ x A
cbvrab.2	|- F/_ y A
cbvrab.3	|- F/ y ph
cbvrab.4	|- F/ x ps
cbvrab.5	|- ( x = y -> ( ph <-> ps ) )

Assertion

Ref	Expression
cbvrab	|- { x e. A | ph } = { y e. A | ps }

Proof of Theorem cbvrab

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfv 1626	. . . 4 |- F/ z ( x e. A /\ ph )
2		cbvrab.1	. . . . . 6 |- F/_ x A
3	2	nfcri 2534	. . . . 5 |- F/ x z e. A
4		nfs1v 2155	. . . . 5 |- F/ x [ z / x ] ph
5	3, 4	nfan 1842	. . . 4 |- F/ x ( z e. A /\ [ z / x ] ph )
6		eleq1 2464	. . . . 5 |- ( x = z -> ( x e. A <-> z e. A ) )
7		sbequ12 1940	. . . . 5 |- ( x = z -> ( ph <-> [ z / x ] ph ) )
8	6, 7	anbi12d 692	. . . 4 |- ( x = z -> ( ( x e. A /\ ph ) <-> ( z e. A /\ [ z / x ] ph ) ) )
9	1, 5, 8	cbvab 2522	. . 3 |- { x | ( x e. A /\ ph ) } = { z | ( z e. A /\ [ z / x ] ph ) }
10		cbvrab.2	. . . . . 6 |- F/_ y A
11	10	nfcri 2534	. . . . 5 |- F/ y z e. A
12		cbvrab.3	. . . . . 6 |- F/ y ph
13	12	nfsb 2158	. . . . 5 |- F/ y [ z / x ] ph
14	11, 13	nfan 1842	. . . 4 |- F/ y ( z e. A /\ [ z / x ] ph )
15		nfv 1626	. . . 4 |- F/ z ( y e. A /\ ps )
16		eleq1 2464	. . . . 5 |- ( z = y -> ( z e. A <-> y e. A ) )
17		sbequ 2109	. . . . . 6 |- ( z = y -> ( [ z / x ] ph <-> [ y / x ] ph ) )
18		cbvrab.4	. . . . . . 7 |- F/ x ps
19		cbvrab.5	. . . . . . 7 |- ( x = y -> ( ph <-> ps ) )
20	18, 19	sbie 2087	. . . . . 6 |- ( [ y / x ] ph <-> ps )
21	17, 20	syl6bb 253	. . . . 5 |- ( z = y -> ( [ z / x ] ph <-> ps ) )
22	16, 21	anbi12d 692	. . . 4 |- ( z = y -> ( ( z e. A /\ [ z / x ] ph ) <-> ( y e. A /\ ps ) ) )
23	14, 15, 22	cbvab 2522	. . 3 |- { z | ( z e. A /\ [ z / x ] ph ) } = { y | ( y e. A /\ ps ) }
24	9, 23	eqtri 2424	. 2 |- { x | ( x e. A /\ ph ) } = { y | ( y e. A /\ ps ) }
25		df-rab 2675	. 2 |- { x e. A | ph } = { x | ( x e. A /\ ph ) }
26		df-rab 2675	. 2 |- { y e. A | ps } = { y | ( y e. A /\ ps ) }
27	24, 25, 26	3eqtr4i 2434	1 |- { x e. A | ph } = { y e. A | ps }

Syntax hints:   -> wi 4   <-> wb 177   /\ wa 359   F/wnf 1550   = wceq 1649   [wsb 1655   e. wcel 1721   {cab 2390   F/_wnfc 2527   {crab 2670

This theorem is referenced by:  cbvrabv  2915  elrabsf  3159  tfis  4793  scottexs  7767  scott0s  7768  elmptrab  17812  suppss2f  24002  eq0rabdioph  26725  rexrabdioph  26744  rexfrabdioph  26745  elnn0rabdioph  26753  dvdsrabdioph  26760  stoweidlem34  27650  stoweidlem59  27675  bnj1534  28930

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1662  ax-8 1683  ax-6 1740  ax-7 1745  ax-11 1757  ax-12 1946  ax-ext 2385

This theorem depends on definitions:  df-bi 178  df-an 361  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-clab 2391  df-cleq 2397  df-clel 2400  df-nfc 2529  df-rab 2675