Theorem nfim1OLD 1812

Description: A closed form of nfim 1813. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 24-Sep-2016.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
nfim1.1	|- F/xph
nfim1.2	|- (ph -> F/xps)

Assertion

Ref	Expression
nfim1OLD	|- F/x(ph -> ps)

Proof of Theorem nfim1OLD

Step	Hyp	Ref	Expression
1		nfim1.2	. . . . 5 |- (ph -> F/xps)
2	1	nfrd 1763	. . . 4 |- (ph -> (ps -> A.xps))
3	2	a2i 12	. . 3 |- ((ph -> ps) -> (ph -> A.xps))
4		nfim1.1	. . . 4 |- F/xph
5	4	19.21 1796	. . 3 |- (A.x(ph -> ps) <-> (ph -> A.xps))
6	3, 5	sylibr 203	. 2 |- ((ph -> ps) -> A.x(ph -> ps))
7	6	nfi 1551	1 |- F/x(ph -> ps)

Syntax hints:   -> wi 4  A.wal 1540   F/wnf 1544

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-11 1746

This theorem depends on definitions:  df-bi 177  df-ex 1542  df-nf 1545

This theorem is referenced by: (None)