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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 5171 via cnvsn 5021, 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 4917 | . 2 | |
2 | moeq 2859 | . . . 4 | |
3 | vex 2689 | . . . . . . . 8 | |
4 | vex 2689 | . . . . . . . 8 | |
5 | 3, 4 | brcnv 4722 | . . . . . . 7 |
6 | df-br 3930 | . . . . . . 7 | |
7 | 5, 6 | bitri 183 | . . . . . 6 |
8 | elsni 3545 | . . . . . . 7 | |
9 | 4, 3 | opth1 4158 | . . . . . . 7 |
10 | 8, 9 | syl 14 | . . . . . 6 |
11 | 7, 10 | sylbi 120 | . . . . 5 |
12 | 11 | moimi 2064 | . . . 4 |
13 | 2, 12 | ax-mp 5 | . . 3 |
14 | 13 | ax-gen 1425 | . 2 |
15 | dffun6 5137 | . 2 | |
16 | 1, 14, 15 | mpbir2an 926 | 1 |
Colors of variables: wff set class |
Syntax hints: wal 1329 wceq 1331 wcel 1480 wmo 2000 csn 3527 cop 3530 class class class wbr 3929 ccnv 4538 wrel 4544 wfun 5117 |
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-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-br 3930 df-opab 3990 df-id 4215 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-fun 5125 |
This theorem is referenced by: funsng 5169 |
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