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Theorem pm2.53 362
Description: Theorem *2.53 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.53

Proof of Theorem pm2.53
StepHypRef Expression
1 df-or 359 . 2
21biimpi 186 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wo 357
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 177  df-or 359
This theorem is referenced by:  jaoi  368  orel1  371  pm2.63  763  pm2.8  823  mtp-orOLD  1539  19.33b  1608  nndisjeq  4429
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