Theorem nfrab 2792

Description: A variable not free in a wff remains so in a restricted class abstraction. (Contributed by NM, 13-Oct-2003.) (Revised by Mario Carneiro, 9-Oct-2016.)

Hypotheses

Ref	Expression
nfrab.1	|- F/xph
nfrab.2	|- F/_xA

Assertion

Ref	Expression
nfrab	|- F/_x{y e. A | ph}

Proof of Theorem nfrab

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-rab 2623	. 2 |- {y e. A | ph} = {y | (y e. A /\ ph)}
2		nftru 1554	. . . 4 |- F/y T.
3		nfrab.2	. . . . . . . 8 |- F/_xA
4	3	nfcri 2483	. . . . . . 7 |- F/x z e. A
5		eleq1 2413	. . . . . . 7 |- (z = y -> (z e. A <-> y e. A))
6	4, 5	dvelimnf 2017	. . . . . 6 |- (-. A.x x = y -> F/x y e. A)
7		nfrab.1	. . . . . . 7 |- F/xph
8	7	a1i 10	. . . . . 6 |- (-. A.x x = y -> F/xph)
9	6, 8	nfand 1822	. . . . 5 |- (-. A.x x = y -> F/x(y e. A /\ ph))
10	9	adantl 452	. . . 4 |- (( T. /\ -. A.x x = y) -> F/x(y e. A /\ ph))
11	2, 10	nfabd2 2507	. . 3 |- ( T. -> F/_x{y | (y e. A /\ ph)})
12	11	trud 1323	. 2 |- F/_x{y | (y e. A /\ ph)}
13	1, 12	nfcxfr 2486	1 |- F/_x{y e. A | ph}

Syntax hints:  -. wn 3   /\ wa 358   T. wtru 1316  A.wal 1540   F/wnf 1544   = wceq 1642   e. wcel 1710  {cab 2339   F/_wnfc 2476  {crab 2618

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-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-rab 2623

This theorem is referenced by: (None)