Theorem nfabd2 2507

Description: Bound-variable hypothesis builder for a class abstraction. (Contributed by Mario Carneiro, 8-Oct-2016.)

Hypotheses

Ref	Expression
nfabd2.1	|- F/yph
nfabd2.2	|- ((ph /\ -. A.x x = y) -> F/xps)

Assertion

Ref	Expression
nfabd2	|- (ph -> F/_x{y | ps})

Proof of Theorem nfabd2

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfv 1619	. . . 4 |- F/z(ph /\ -. A.x x = y)
2		df-clab 2340	. . . . 5 |- (z e. {y | ps} <-> [z / y]ps)
3		nfabd2.1	. . . . . . 7 |- F/yph
4		nfnae 1956	. . . . . . 7 |- F/y -. A.x x = y
5	3, 4	nfan 1824	. . . . . 6 |- F/y(ph /\ -. A.x x = y)
6		nfabd2.2	. . . . . 6 |- ((ph /\ -. A.x x = y) -> F/xps)
7	5, 6	nfsbd 2111	. . . . 5 |- ((ph /\ -. A.x x = y) -> F/x[z / y]ps)
8	2, 7	nfxfrd 1571	. . . 4 |- ((ph /\ -. A.x x = y) -> F/x z e. {y | ps})
9	1, 8	nfcd 2484	. . 3 |- ((ph /\ -. A.x x = y) -> F/_x{y | ps})
10	9	ex 423	. 2 |- (ph -> (-. A.x x = y -> F/_x{y | ps}))
11		nfab1 2491	. . 3 |- F/_y{y | ps}
12		eqidd 2354	. . . 4 |- (A.x x = y -> {y | ps} = {y | ps})
13	12	drnfc1 2505	. . 3 |- (A.x x = y -> ( F/_x{y | ps} <-> F/_y{y | ps}))
14	11, 13	mpbiri 224	. 2 |- (A.x x = y -> F/_x{y | ps})
15	10, 14	pm2.61d2 152	1 |- (ph -> F/_x{y | ps})

Syntax hints:  -. wn 3   -> wi 4   /\ wa 358  A.wal 1540   F/wnf 1544   = wceq 1642  [wsb 1648   e. wcel 1710  {cab 2339   F/_wnfc 2476

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-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

This theorem is referenced by:  nfabd  2508  nfrab  2792