Theorem pm2.3 572

Description: Theorem *2.3 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm2.3

Proof of Theorem pm2.3

Step	Hyp	Ref	Expression
1		pm1.4 386	. 2
2	1	orim2i 518	1

Syntax hints:  ->wi 4  \/wo 368

This theorem is referenced by:  meran1  29876  meran3  29878

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