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Mirrors > Home > NFE Home > Th. List > orordir | Unicode version |
Description: Distribution of disjunction over disjunction. (Contributed by NM, 25-Feb-1995.) |
Ref | Expression |
---|---|
orordir |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oridm 500 |
. . 3
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2 | 1 | orbi2i 505 |
. 2
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3 | or4 514 |
. 2
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4 | 2, 3 | bitr3i 242 |
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 |
This theorem is referenced by: sspsstri 3372 |
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