Theorem nfreud 2784

Description: Deduction version of nfreu 2786. (Contributed by NM, 15-Feb-2013.) (Revised by Mario Carneiro, 8-Oct-2016.)

Hypotheses

Ref	Expression
nfreud.1	|- F/yph
nfreud.2	|- (ph -> F/_xA)
nfreud.3	|- (ph -> F/xps)

Assertion

Ref	Expression
nfreud	|- (ph -> F/xE!y e. A ps)

Proof of Theorem nfreud

Step	Hyp	Ref	Expression
1		df-reu 2622	. 2 |- (E!y e. A ps <-> E!y(y e. A /\ ps))
2		nfreud.1	. . 3 |- F/yph
3		nfcvf 2512	. . . . . 6 |- (-. A.x x = y -> F/_xy)
4	3	adantl 452	. . . . 5 |- ((ph /\ -. A.x x = y) -> F/_xy)
5		nfreud.2	. . . . . 6 |- (ph -> F/_xA)
6	5	adantr 451	. . . . 5 |- ((ph /\ -. A.x x = y) -> F/_xA)
7	4, 6	nfeld 2505	. . . 4 |- ((ph /\ -. A.x x = y) -> F/x y e. A)
8		nfreud.3	. . . . 5 |- (ph -> F/xps)
9	8	adantr 451	. . . 4 |- ((ph /\ -. A.x x = y) -> F/xps)
10	7, 9	nfand 1822	. . 3 |- ((ph /\ -. A.x x = y) -> F/x(y e. A /\ ps))
11	2, 10	nfeud2 2216	. 2 |- (ph -> F/xE!y(y e. A /\ ps))
12	1, 11	nfxfrd 1571	1 |- (ph -> F/xE!y e. A ps)

Syntax hints:  -. wn 3   -> wi 4   /\ wa 358  A.wal 1540   F/wnf 1544   = wceq 1642   e. wcel 1710  E!weu 2204   F/_wnfc 2477  E!wreu 2617

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-eu 2208  df-cleq 2346  df-clel 2349  df-nfc 2479  df-reu 2622

This theorem is referenced by:  nfreu  2786