Theorem pm2.67 418

Description: Theorem *2.67 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm2.67	|- ( ( ( ph \/ ps ) -> ps ) -> ( ph -> ps ) )

Proof of Theorem pm2.67

Step	Hyp	Ref	Expression
1		pm2.67-2 417	1 |- ( ( ( ph \/ ps ) -> ps ) -> ( ph -> ps ) )

Syntax hints:   -> wi 4   \/ wo 383

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 197  df-or 385

This theorem is referenced by: (None)