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Theorem pm4.61 415
Description: Theorem *4.61 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.61

Proof of Theorem pm4.61
StepHypRef Expression
1 annim 414 . 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-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-an 360
This theorem is referenced by:  pm4.65  416  npss  3379  difin  3492
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