Theorem pm2.38 815

Description: Theorem *2.38 of [WhiteheadRussell] p. 105. (Contributed by NM, 6-Mar-2008.)

Assertion

Ref	Expression
pm2.38	|- ((ps -> ch) -> ((ps \/ ph) -> (ch \/ ph)))

Proof of Theorem pm2.38

Step	Hyp	Ref	Expression
1		id 19	. 2 |- ((ps -> ch) -> (ps -> ch))
2	1	orim1d 812	1 |- ((ps -> ch) -> ((ps \/ ph) -> (ch \/ ph)))

Syntax hints:   -> wi 4   \/ wo 357

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360

This theorem is referenced by:  pm2.36  816  pm2.37  817