Theorem pm2.43b 52

Description: Inference absorbing redundant antecedent. (Contributed by NM, 31-Oct-1995.)

Hypothesis

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

Assertion

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

Proof of Theorem pm2.43b

Step	Hyp	Ref	Expression
1		pm2.43b.1	. . 3 |- ( ps -> ( ph -> ( ps -> ch ) ) )
2	1	pm2.43a 51	. 2 |- ( ps -> ( ph -> ch ) )
3	2	com12 30	1 |- ( ph -> ( ps -> ch ) )

Syntax hints:   -> wi 4

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

This theorem is referenced by:  trel  4139  trss  4141  elirr  4578  en2lp  4591  funfvima  5797  nnmulcl  9028  ico0  10368  ioc0  10369  bj-nn0sucALT  15708