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Theorem 3orcoma 981
Description: Commutation law for triple disjunction. (Contributed by Mario Carneiro, 4-Sep-2016.)
Assertion
Ref Expression
3orcoma

Proof of Theorem 3orcoma
StepHypRef Expression
1 or12 523 . 2
2 3orass 976 . 2
3 3orass 976 . 2
41, 2, 33bitr4i 277 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  \/wo 368  \/w3o 972
This theorem is referenced by:  cadcomb  1463  eliccioo  27627
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-3or 974
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