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Mirrors > Home > ILE Home > Th. List > iotabi | Unicode version |
Description: Equivalence theorem for descriptions. (Contributed by Andrew Salmon, 30-Jun-2011.) |
Ref | Expression |
---|---|
iotabi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | abbi 2291 |
. . . . . 6
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2 | 1 | biimpi 120 |
. . . . 5
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3 | 2 | eqeq1d 2186 |
. . . 4
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4 | 3 | abbidv 2295 |
. . 3
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5 | 4 | unieqd 3818 |
. 2
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6 | df-iota 5173 |
. 2
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7 | df-iota 5173 |
. 2
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8 | 5, 6, 7 | 3eqtr4g 2235 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-ext 2159 |
This theorem depends on definitions: df-bi 117 df-tru 1356 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-rex 2461 df-uni 3808 df-iota 5173 |
This theorem is referenced by: iotabidv 5194 iotabii 5195 eusvobj1 5855 |
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