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Theorem or4 514
Description: Rearrangement of 4 disjuncts. (Contributed by NM, 12-Aug-1994.)
Assertion
Ref Expression
or4

Proof of Theorem or4
StepHypRef Expression
1 or12 509 . . 3
21orbi2i 505 . 2
3 orass 510 . 2
4 orass 510 . 2
52, 3, 43bitr4i 268 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   wo 357
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 177  df-or 359
This theorem is referenced by:  or42  515  orordi  516  orordir  517  3or6  1263
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