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Theorem orddi 869
Description: Double distributive law for disjunction. (Contributed by NM, 12-Aug-1994.)
Assertion
Ref Expression
orddi

Proof of Theorem orddi
StepHypRef Expression
1 ordir 865 . 2
2 ordi 864 . . 3
3 ordi 864 . . 3
42, 3anbi12i 697 . 2
51, 4bitri 249 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  \/wo 368  /\wa 369
This theorem is referenced by:  prneimg  4211
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  df-an 371
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