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Mirrors > Home > NFE Home > Th. List > orddi | Unicode version |
Description: Double distributive law for disjunction. (Contributed by NM, 12-Aug-1994.) |
Ref | Expression |
---|---|
orddi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordir 835 |
. 2
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2 | ordi 834 |
. . 3
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3 | ordi 834 |
. . 3
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4 | 2, 3 | anbi12i 678 |
. 2
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5 | 1, 4 | bitri 240 |
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-an 360 |
This theorem is referenced by: (None) |
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