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Theorem pm1.4 376
Description: Axiom *1.4 of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.4  |-  ( (
ph  \/  ps )  ->  ( ps  \/  ph ) )

Proof of Theorem pm1.4
StepHypRef Expression
1 olc 374 . 2  |-  ( ph  ->  ( ps  \/  ph ) )
2 orc 375 . 2  |-  ( ps 
->  ( ps  \/  ph ) )
31, 2jaoi 369 1  |-  ( (
ph  \/  ps )  ->  ( ps  \/  ph ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 358
This theorem is referenced by:  orcom  377  orcoms  379  pm2.3  556  pm2.36  817  pm2.37  818  rb-ax2  1527  prneimg  3970  orbi1rVD  28814
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 178  df-or 360
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