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Theorem pm4.39 841
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 443 . 2
2 simpr 447 . 2
31, 2orbi12d 690 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176   wo 357   wa 358
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 177  df-or 359  df-an 360
This theorem is referenced by: (None)
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