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Theorem oranabs 856
Description: Absorb a disjunct into a conjunct. (Contributed by Roy F. Longton, 23-Jun-2005.) (Proof shortened by Wolf Lammen, 10-Nov-2013.)
Assertion
Ref Expression
oranabs

Proof of Theorem oranabs
StepHypRef Expression
1 biortn 406 . . 3
2 orcom 387 . . 3
31, 2syl6rbb 262 . 2
43pm5.32ri 638 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  \/wo 368  /\wa 369
This theorem is referenced by:  itg2addnclem3  30068
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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