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Theorem pm4.63 410
Description: Theorem *4.63 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.63

Proof of Theorem pm4.63
StepHypRef Expression
1 df-an 360 . 2
21bicomi 193 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wb 176   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-an 360
This theorem is referenced by:  pm4.67  417
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