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Mirrors > Home > ILE Home > Th. List > dfiota2 | Unicode version |
Description: Alternate definition for descriptions. Definition 8.18 in [Quine] p. 56. (Contributed by Andrew Salmon, 30-Jun-2011.) |
Ref | Expression |
---|---|
dfiota2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-iota 4993 |
. 2
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2 | df-sn 3456 |
. . . . . 6
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3 | 2 | eqeq2i 2099 |
. . . . 5
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4 | abbi 2202 |
. . . . 5
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5 | 3, 4 | bitr4i 186 |
. . . 4
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6 | 5 | abbii 2204 |
. . 3
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7 | 6 | unieqi 3669 |
. 2
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8 | 1, 7 | eqtri 2109 |
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 105 ax-ia2 106 ax-ia3 107 ax-io 666 ax-5 1382 ax-7 1383 ax-gen 1384 ax-ie1 1428 ax-ie2 1429 ax-8 1441 ax-10 1442 ax-11 1443 ax-i12 1444 ax-bndl 1445 ax-4 1446 ax-17 1465 ax-i9 1469 ax-ial 1473 ax-i5r 1474 ax-ext 2071 |
This theorem depends on definitions: df-bi 116 df-tru 1293 df-nf 1396 df-sb 1694 df-clab 2076 df-cleq 2082 df-clel 2085 df-nfc 2218 df-rex 2366 df-sn 3456 df-uni 3660 df-iota 4993 |
This theorem is referenced by: nfiota1 4995 nfiotadxy 4996 cbviota 4998 sb8iota 5000 iotaval 5004 iotanul 5008 fv2 5313 |
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