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Theorem orordir 531
Description: Distribution of disjunction over disjunction. (Contributed by NM, 25-Feb-1995.)
Assertion
Ref Expression
orordir

Proof of Theorem orordir
StepHypRef Expression
1 oridm 514 . . 3
21orbi2i 519 . 2
3 or4 528 . 2
42, 3bitr3i 251 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  \/wo 368
This theorem is referenced by:  sspsstri  3605  psslinpr  9430  elznn0  10904  tosso  15666  legso  23985
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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