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Mirrors > Home > ILE Home > Th. List > bi3 | Unicode version |
Description: Property of the biconditional connective. (Contributed by NM, 11-May-1999.) |
Ref | Expression |
---|---|
bi3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-bi 115 | . . 3 | |
2 | 1 | simpri 111 | . 2 |
3 | 2 | ex 113 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wb 103 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia2 105 ax-ia3 106 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: impbii 124 impbidd 125 bisym 223 bezoutlembi 10394 |
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