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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
StepHypRef Expression
1 pm1.4 386 . 2
21orim2i 518 1
Colors of variables: wff setvar class
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
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