Theorem pm2.38 628

Description: Theorem *2.38 of [WhiteheadRussell] p. 105.

Assertion

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

Proof of Theorem pm2.38

Step	Hyp	Ref	Expression
1		id 73	. 2 |- ((ps -> ch) -> (ps -> ch))
2	1	orim1d 625	1 |- ((ps -> ch) -> ((ps \/ ph) -> (ch \/ ph)))

Syntax hints:   -> wi 3   \/ wo 239

This theorem is referenced by:  pm2.36 629  pm2.37 630  unss1OLD 2774  naim1 14134

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7

This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242

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