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Mirrors > Home > ILE Home > Th. List > funcnvsn | Unicode version |
Description: The converse singleton of an ordered pair is a function. This is equivalent to funsn 4948 via cnvsn 4803, but stating it this way allows us to skip the sethood assumptions on and . (Contributed by NM, 30-Apr-2015.) |
Ref | Expression |
---|---|
funcnvsn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | relcnv 4703 | . 2 | |
2 | moeq 2716 | . . . 4 | |
3 | vex 2560 | . . . . . . . 8 | |
4 | vex 2560 | . . . . . . . 8 | |
5 | 3, 4 | brcnv 4518 | . . . . . . 7 |
6 | df-br 3765 | . . . . . . 7 | |
7 | 5, 6 | bitri 173 | . . . . . 6 |
8 | elsni 3393 | . . . . . . 7 | |
9 | 4, 3 | opth1 3973 | . . . . . . 7 |
10 | 8, 9 | syl 14 | . . . . . 6 |
11 | 7, 10 | sylbi 114 | . . . . 5 |
12 | 11 | moimi 1965 | . . . 4 |
13 | 2, 12 | ax-mp 7 | . . 3 |
14 | 13 | ax-gen 1338 | . 2 |
15 | dffun6 4916 | . 2 | |
16 | 1, 14, 15 | mpbir2an 849 | 1 |
Colors of variables: wff set class |
Syntax hints: wal 1241 wceq 1243 wcel 1393 wmo 1901 csn 3375 cop 3378 class class class wbr 3764 ccnv 4344 wrel 4350 wfun 4896 |
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-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pow 3927 ax-pr 3944 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-rex 2312 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-br 3765 df-opab 3819 df-id 4030 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-fun 4904 |
This theorem is referenced by: funsng 4946 |
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