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Mirrors > Home > ILE Home > Th. List > dfopab2 | Unicode version |
Description: A way to define an ordered-pair class abstraction without using existential quantifiers. (Contributed by NM, 18-Aug-2006.) (Revised by Mario Carneiro, 31-Aug-2015.) |
Ref | Expression |
---|---|
dfopab2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfsbc1v 2922 | . . . . 5 | |
2 | 1 | 19.41 1664 | . . . 4 |
3 | sbcopeq1a 6078 | . . . . . . . 8 | |
4 | 3 | pm5.32i 449 | . . . . . . 7 |
5 | 4 | exbii 1584 | . . . . . 6 |
6 | nfcv 2279 | . . . . . . . 8 | |
7 | nfsbc1v 2922 | . . . . . . . 8 | |
8 | 6, 7 | nfsbc 2924 | . . . . . . 7 |
9 | 8 | 19.41 1664 | . . . . . 6 |
10 | 5, 9 | bitr3i 185 | . . . . 5 |
11 | 10 | exbii 1584 | . . . 4 |
12 | elvv 4596 | . . . . 5 | |
13 | 12 | anbi1i 453 | . . . 4 |
14 | 2, 11, 13 | 3bitr4i 211 | . . 3 |
15 | 14 | abbii 2253 | . 2 |
16 | df-opab 3985 | . 2 | |
17 | df-rab 2423 | . 2 | |
18 | 15, 16, 17 | 3eqtr4i 2168 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wceq 1331 wex 1468 wcel 1480 cab 2123 crab 2418 cvv 2681 wsbc 2904 cop 3525 copab 3983 cxp 4532 cfv 5118 c1st 6029 c2nd 6030 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-rab 2423 df-v 2683 df-sbc 2905 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-br 3925 df-opab 3985 df-mpt 3986 df-id 4210 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-iota 5083 df-fun 5120 df-fv 5126 df-1st 6031 df-2nd 6032 |
This theorem is referenced by: (None) |
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