Theorem bj-a1k 32535

Description: Weakening of ax-1 6. This shortens the proofs of dfwe2 6981 (937>925), ordunisuc2 7044 (789>777), r111 8638 (558>545), smo11 7461 (1176>1164). (Contributed by BJ, 11-Aug-2020.)

Assertion

Ref	Expression
bj-a1k	|- ( ph -> ( ps -> ( ch -> ps ) ) )

Proof of Theorem bj-a1k

Step	Hyp	Ref	Expression
1		ax-1 6	. 2 |- ( ps -> ( ch -> ps ) )
2	1	a1i 11	1 |- ( ph -> ( ps -> ( ch -> ps ) ) )

Syntax hints:   -> wi 4

This theorem was proved from axioms:  ax-mp 5  ax-1 6

This theorem is referenced by: (None)