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Theorem pm5.19 360
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 236 . 2
2 pm5.18 356 . 2
31, 2mpbi 208 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184
This theorem is referenced by:  xorexmid  1379  ru  3326  pwfseqlem1  9057  bisym1  29884  rusbcALT  31346  bj-ru0  34500
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
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