Theorem pm2.43a 45

Description: Inference absorbing redundant antecedent. (Contributed by NM, 7-Nov-1995.) (Proof shortened by O'Cat, 28-Nov-2008.)

Hypothesis

Ref	Expression
pm2.43a.1	|- ( ps -> ( ph -> ( ps -> ch ) ) )

Assertion

Ref	Expression
pm2.43a	|- ( ps -> ( ph -> ch ) )

Proof of Theorem pm2.43a

Step	Hyp	Ref	Expression
1		id 19	. 2 |- ( ps -> ps )
2		pm2.43a.1	. 2 |- ( ps -> ( ph -> ( ps -> ch ) ) )
3	1, 2	mpid 37	1 |- ( ps -> ( ph -> ch ) )

Syntax hints:   -> wi 4

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7

This theorem is referenced by:  pm2.43b  46  rspc  2650  intss1  3630  fvopab3ig  5246  nndi  6065  uzind2  8350  ssfzo12  9080