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Theorem pm2.74 819
Description: Theorem *2.74 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Andrew Salmon, 7-May-2011.)
Assertion
Ref Expression
pm2.74

Proof of Theorem pm2.74
StepHypRef Expression
1 orel2 372 . . 3
2 ax-1 5 . . 3
31, 2ja 153 . 2
43orim1d 812 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wo 357
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-or 359  df-an 360
This theorem is referenced by: (None)
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