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Mirrors > Home > NFE Home > Th. List > 3orcomb | Unicode version |
Description: Commutation law for triple disjunction. (Contributed by Scott Fenton, 20-Apr-2011.) |
Ref | Expression |
---|---|
3orcomb |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orcom 376 |
. . 3
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2 | 1 | orbi2i 505 |
. 2
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3 | 3orass 937 |
. 2
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4 | 3orass 937 |
. 2
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5 | 2, 3, 4 | 3bitr4i 268 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() ![]() |
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 df-3or 935 |
This theorem is referenced by: eueq3 3012 |
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