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Theorem pm4.66 420
Description: Theorem *4.66 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.66

Proof of Theorem pm4.66
StepHypRef Expression
1 pm4.64 372 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184  \/wo 368
This theorem is referenced by:  pm4.54  493  hirstL-ax3  32087  bj-ifim123g  37706
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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