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Theorem pm5.19 349
Description: Theorem *5.19 of [WhiteheadRussell] p. 124. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.19

Proof of Theorem pm5.19
StepHypRef Expression
1 biid 227 . 2
2 pm5.18 345 . 2
31, 2mpbi 199 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176
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
This theorem is referenced by:  ru  3045  necompl  3544  nenpw1pwlem2  6085
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