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Theorem pm5.14 881
Description: Theorem *5.14 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.14

Proof of Theorem pm5.14
StepHypRef Expression
1 ax-1 6 . . . 4
21con3i 135 . . 3
32pm2.21d 106 . 2
43orri 376 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  \/wo 368
This theorem is referenced by:  pm5.13  882
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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