Theorem bj-exlimmp 15425

Description: Lemma for bj-vtoclgf 15432. (Contributed by BJ, 21-Nov-2019.) (Proof modification is discouraged.)

Hypotheses

Ref	Expression
bj-exlimmp.nf	|- F/ x ps
bj-exlimmp.min	|- ( ch -> ph )

Assertion

Ref	Expression
bj-exlimmp	|- ( A. x ( ch -> ( ph -> ps ) ) -> ( E. x ch -> ps ) )

Proof of Theorem bj-exlimmp

Step	Hyp	Ref	Expression
1		nfa1 1555	. 2 |- F/ x A. x ( ch -> ( ph -> ps ) )
2		bj-exlimmp.nf	. 2 |- F/ x ps
3		bj-exlimmp.min	. . . . 5 |- ( ch -> ph )
4		idd 21	. . . . 5 |- ( ch -> ( ps -> ps ) )
5	3, 4	embantd 56	. . . 4 |- ( ch -> ( ( ph -> ps ) -> ps ) )
6	5	a2i 11	. . 3 |- ( ( ch -> ( ph -> ps ) ) -> ( ch -> ps ) )
7	6	sps 1551	. 2 |- ( A. x ( ch -> ( ph -> ps ) ) -> ( ch -> ps ) )
8	1, 2, 7	exlimd 1611	1 |- ( A. x ( ch -> ( ph -> ps ) ) -> ( E. x ch -> ps ) )

Syntax hints:   -> wi 4   A.wal 1362   F/wnf 1474   E.wex 1506

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1461  ax-gen 1463  ax-ie2 1508  ax-4 1524  ax-ial 1548

This theorem depends on definitions:  df-bi 117  df-nf 1475

This theorem is referenced by:  bj-vtoclgft  15431