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Mirrors > Home > ILE Home > Th. List > dffo4 | Unicode version |
Description: Alternate definition of an onto mapping. (Contributed by NM, 20-Mar-2007.) |
Ref | Expression |
---|---|
dffo4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dffo2 5110 | . . 3 | |
2 | simpl 102 | . . . 4 | |
3 | vex 2560 | . . . . . . . . . 10 | |
4 | 3 | elrn 4577 | . . . . . . . . 9 |
5 | eleq2 2101 | . . . . . . . . 9 | |
6 | 4, 5 | syl5bbr 183 | . . . . . . . 8 |
7 | 6 | biimpar 281 | . . . . . . 7 |
8 | 7 | adantll 445 | . . . . . 6 |
9 | ffn 5046 | . . . . . . . . . . 11 | |
10 | fnbr 5001 | . . . . . . . . . . . 12 | |
11 | 10 | ex 108 | . . . . . . . . . . 11 |
12 | 9, 11 | syl 14 | . . . . . . . . . 10 |
13 | 12 | ancrd 309 | . . . . . . . . 9 |
14 | 13 | eximdv 1760 | . . . . . . . 8 |
15 | df-rex 2312 | . . . . . . . 8 | |
16 | 14, 15 | syl6ibr 151 | . . . . . . 7 |
17 | 16 | ad2antrr 457 | . . . . . 6 |
18 | 8, 17 | mpd 13 | . . . . 5 |
19 | 18 | ralrimiva 2392 | . . . 4 |
20 | 2, 19 | jca 290 | . . 3 |
21 | 1, 20 | sylbi 114 | . 2 |
22 | fnbrfvb 5214 | . . . . . . . . 9 | |
23 | 22 | biimprd 147 | . . . . . . . 8 |
24 | eqcom 2042 | . . . . . . . 8 | |
25 | 23, 24 | syl6ib 150 | . . . . . . 7 |
26 | 9, 25 | sylan 267 | . . . . . 6 |
27 | 26 | reximdva 2421 | . . . . 5 |
28 | 27 | ralimdv 2388 | . . . 4 |
29 | 28 | imdistani 419 | . . 3 |
30 | dffo3 5314 | . . 3 | |
31 | 29, 30 | sylibr 137 | . 2 |
32 | 21, 31 | impbii 117 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wb 98 wceq 1243 wex 1381 wcel 1393 wral 2306 wrex 2307 class class class wbr 3764 crn 4346 wfn 4897 wf 4898 wfo 4900 cfv 4902 |
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-sbc 2765 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-uni 3581 df-br 3765 df-opab 3819 df-mpt 3820 df-id 4030 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-dm 4355 df-rn 4356 df-iota 4867 df-fun 4904 df-fn 4905 df-f 4906 df-fo 4908 df-fv 4910 |
This theorem is referenced by: dffo5 5316 |
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