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Mirrors > Home > ILE Home > Th. List > ereq2 | Unicode version |
Description: Equality theorem for equivalence predicate. (Contributed by Mario Carneiro, 12-Aug-2015.) |
Ref | Expression |
---|---|
ereq2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq2 2097 |
. . 3
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2 | 1 | 3anbi2d 1253 |
. 2
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3 | df-er 6282 |
. 2
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4 | df-er 6282 |
. 2
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5 | 2, 3, 4 | 3bitr4g 221 |
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 104 ax-ia2 105 ax-ia3 106 ax-5 1381 ax-gen 1383 ax-4 1445 ax-17 1464 ax-ext 2070 |
This theorem depends on definitions: df-bi 115 df-3an 926 df-cleq 2081 df-er 6282 |
This theorem is referenced by: iserd 6308 |
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