Theorem nfreu 2786

Description: Bound-variable hypothesis builder for restricted uniqueness. (Contributed by NM, 30-Oct-2010.) (Revised by Mario Carneiro, 8-Oct-2016.)

Hypotheses

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

Assertion

Ref	Expression
nfreu	|- F/xE!y e. A ph

Proof of Theorem nfreu

Step	Hyp	Ref	Expression
1		nftru 1554	. . 3 |- F/y T.
2		nfreu.1	. . . 4 |- F/_xA
3	2	a1i 10	. . 3 |- ( T. -> F/_xA)
4		nfreu.2	. . . 4 |- F/xph
5	4	a1i 10	. . 3 |- ( T. -> F/xph)
6	1, 3, 5	nfreud 2784	. 2 |- ( T. -> F/xE!y e. A ph)
7	6	trud 1323	1 |- F/xE!y e. A ph

Syntax hints:   T. wtru 1316   F/wnf 1544   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:  sbcreug  3123