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Mirrors > Home > ILE Home > Th. List > fsn | Unicode version |
Description: A function maps a singleton to a singleton iff it is the singleton of an ordered pair. (Contributed by NM, 10-Dec-2003.) |
Ref | Expression |
---|---|
fsn.1 | |
fsn.2 |
Ref | Expression |
---|---|
fsn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | opelf 5082 | . . . . . . . 8 | |
2 | velsn 3415 | . . . . . . . . 9 | |
3 | velsn 3415 | . . . . . . . . 9 | |
4 | 2, 3 | anbi12i 447 | . . . . . . . 8 |
5 | 1, 4 | sylib 120 | . . . . . . 7 |
6 | 5 | ex 113 | . . . . . 6 |
7 | fsn.1 | . . . . . . . . . 10 | |
8 | 7 | snid 3425 | . . . . . . . . 9 |
9 | feu 5092 | . . . . . . . . 9 | |
10 | 8, 9 | mpan2 415 | . . . . . . . 8 |
11 | 3 | anbi1i 445 | . . . . . . . . . . 11 |
12 | opeq2 3571 | . . . . . . . . . . . . . 14 | |
13 | 12 | eleq1d 2147 | . . . . . . . . . . . . 13 |
14 | 13 | pm5.32i 441 | . . . . . . . . . . . 12 |
15 | ancom 262 | . . . . . . . . . . . 12 | |
16 | 14, 15 | bitr4i 185 | . . . . . . . . . . 11 |
17 | 11, 16 | bitr2i 183 | . . . . . . . . . 10 |
18 | 17 | eubii 1950 | . . . . . . . . 9 |
19 | fsn.2 | . . . . . . . . . . . 12 | |
20 | 19 | eueq1 2764 | . . . . . . . . . . 11 |
21 | 20 | biantru 296 | . . . . . . . . . 10 |
22 | euanv 1998 | . . . . . . . . . 10 | |
23 | 21, 22 | bitr4i 185 | . . . . . . . . 9 |
24 | df-reu 2355 | . . . . . . . . 9 | |
25 | 18, 23, 24 | 3bitr4i 210 | . . . . . . . 8 |
26 | 10, 25 | sylibr 132 | . . . . . . 7 |
27 | opeq12 3572 | . . . . . . . 8 | |
28 | 27 | eleq1d 2147 | . . . . . . 7 |
29 | 26, 28 | syl5ibrcom 155 | . . . . . 6 |
30 | 6, 29 | impbid 127 | . . . . 5 |
31 | vex 2604 | . . . . . . . 8 | |
32 | vex 2604 | . . . . . . . 8 | |
33 | 31, 32 | opex 3984 | . . . . . . 7 |
34 | 33 | elsn 3414 | . . . . . 6 |
35 | 7, 19 | opth2 3995 | . . . . . 6 |
36 | 34, 35 | bitr2i 183 | . . . . 5 |
37 | 30, 36 | syl6bb 194 | . . . 4 |
38 | 37 | alrimivv 1796 | . . 3 |
39 | frel 5069 | . . . 4 | |
40 | 7, 19 | relsnop 4462 | . . . 4 |
41 | eqrel 4447 | . . . 4 | |
42 | 39, 40, 41 | sylancl 404 | . . 3 |
43 | 38, 42 | mpbird 165 | . 2 |
44 | 7, 19 | f1osn 5186 | . . . 4 |
45 | f1oeq1 5137 | . . . 4 | |
46 | 44, 45 | mpbiri 166 | . . 3 |
47 | f1of 5146 | . . 3 | |
48 | 46, 47 | syl 14 | . 2 |
49 | 43, 48 | impbii 124 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 102 wb 103 wal 1282 wceq 1284 wcel 1433 weu 1941 wreu 2350 cvv 2601 csn 3398 cop 3401 wrel 4368 wf 4918 wf1o 4921 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-reu 2355 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-br 3786 df-opab 3840 df-id 4048 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 |
This theorem is referenced by: fsng 5357 |
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