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Mirrors > Home > ILE Home > Th. List > iota2df | Unicode version |
Description: A condition that allows us to represent "the unique element such that " with a class expression . (Contributed by NM, 30-Dec-2014.) |
Ref | Expression |
---|---|
iota2df.1 | |
iota2df.2 | |
iota2df.3 | |
iota2df.4 | |
iota2df.5 | |
iota2df.6 |
Ref | Expression |
---|---|
iota2df |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iota2df.1 | . 2 | |
2 | iota2df.3 | . . 3 | |
3 | simpr 103 | . . . 4 | |
4 | 3 | eqeq2d 2051 | . . 3 |
5 | 2, 4 | bibi12d 224 | . 2 |
6 | iota2df.2 | . . 3 | |
7 | iota1 4881 | . . 3 | |
8 | 6, 7 | syl 14 | . 2 |
9 | iota2df.4 | . 2 | |
10 | iota2df.6 | . 2 | |
11 | iota2df.5 | . . 3 | |
12 | nfiota1 4869 | . . . . 5 | |
13 | 12 | a1i 9 | . . . 4 |
14 | 13, 10 | nfeqd 2192 | . . 3 |
15 | 11, 14 | nfbid 1480 | . 2 |
16 | 1, 5, 8, 9, 10, 15 | vtocldf 2605 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wb 98 wceq 1243 wnf 1349 wcel 1393 weu 1900 wnfc 2165 cio 4865 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-eu 1903 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-rex 2312 df-v 2559 df-sbc 2765 df-un 2922 df-sn 3381 df-pr 3382 df-uni 3581 df-iota 4867 |
This theorem is referenced by: iota2d 4892 iota2 4893 riota2df 5488 |
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