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Mirrors > Home > ILE Home > Th. List > biid | Unicode version |
Description: Principle of identity for logical equivalence. Theorem *4.2 of [WhiteheadRussell] p. 117. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
biid |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 |
. 2
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2 | 1, 1 | impbii 124 |
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-ia2 105 ax-ia3 106 |
This theorem depends on definitions: df-bi 115 |
This theorem is referenced by: biidd 170 3anbi1i 1130 3anbi2i 1131 3anbi3i 1132 trubitru 1347 falbifal 1350 eqid 2083 abid2 2203 abid2f 2247 ceqsexg 2733 nnwetri 6551 |
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