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Theorem or12 509
Description: Swap two disjuncts. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 14-Nov-2012.)
Assertion
Ref Expression
or12

Proof of Theorem or12
StepHypRef Expression
1 pm1.5 508 . 2
2 pm1.5 508 . 2
31, 2impbii 180 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   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:  orass  510  or32  513  or4  514  3orcoma  942
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