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Mirrors > Home > ILE Home > Th. List > biort | Unicode version |
Description: A wff is disjoined with truth is true. (Contributed by NM, 23-May-1999.) |
Ref | Expression |
---|---|
biort |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | orc 684 |
. 2
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2 | ax-1 5 |
. 2
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3 | 1, 2 | impbid2 142 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 681 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: pm5.55dc 881 |
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