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Theorem oranabs 727
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 663 . . 3
2 orcom 646 . . 3
31, 2syl6rbb 186 . 2
43pm5.32ri 428 1
Colors of variables: wff set class
Syntax hints:   wn 3   wa 97   wb 98   wo 628
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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