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Theorem pm4.39 871
Description: Theorem *4.39 of [WhiteheadRussell] p. 118. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.39

Proof of Theorem pm4.39
StepHypRef Expression
1 simpl 457 . 2
2 simpr 461 . 2
31, 2orbi12d 709 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184  \/wo 368  /\wa 369
This theorem is referenced by:  3orbi123VD  33650
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  df-an 371
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