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Mirrors > Home > ILE Home > Th. List > trubitru | Unicode version |
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.) |
Ref | Expression |
---|---|
trubitru |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | biid 170 | . 2 | |
2 | 1 | bitru 1347 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wtru 1336 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 |
This theorem depends on definitions: df-bi 116 df-tru 1338 |
This theorem is referenced by: (None) |
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