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Theorem pm2.4 694
Description: Theorem *2.4 of [WhiteheadRussell] p. 106. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.4

Proof of Theorem pm2.4
StepHypRef Expression
1 orc 632 . 2
2 id 19 . 2
31, 2jaoi 635 1
Colors of variables: wff set class
Syntax hints:   wi 4   wo 628
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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