Theorem pm2.67-2 402

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

Assertion

Ref	Expression
pm2.67-2

Proof of Theorem pm2.67-2

Step	Hyp	Ref	Expression
1		orc 385	. 2
2	1	imim1i 58	1

Syntax hints:  ->wi 4  \/wo 368

This theorem is referenced by:  pm2.67  403  jaob  783

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 185  df-or 370