Theorem pm2.83 71

Description: Theorem *2.83 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm2.83	|- ((ph -> (ps -> ch)) -> ((ph -> (ch -> th)) -> (ph -> (ps -> th))))

Proof of Theorem pm2.83

Step	Hyp	Ref	Expression
1		imim1 70	. 2 |- ((ps -> ch) -> ((ch -> th) -> (ps -> th)))
2	1	imim3i 55	1 |- ((ph -> (ps -> ch)) -> ((ph -> (ch -> th)) -> (ph -> (ps -> th))))

Syntax hints:   -> wi 4

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

This theorem is referenced by: (None)