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Mirrors > Home > ILE Home > Th. List > dffo3 | Unicode version |
Description: An onto mapping expressed in terms of function values. (Contributed by NM, 29-Oct-2006.) |
Ref | Expression |
---|---|
dffo3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dffo2 5110 | . 2 | |
2 | ffn 5046 | . . . . 5 | |
3 | fnrnfv 5220 | . . . . . 6 | |
4 | 3 | eqeq1d 2048 | . . . . 5 |
5 | 2, 4 | syl 14 | . . . 4 |
6 | simpr 103 | . . . . . . . . . . 11 | |
7 | ffvelrn 5300 | . . . . . . . . . . . 12 | |
8 | 7 | adantr 261 | . . . . . . . . . . 11 |
9 | 6, 8 | eqeltrd 2114 | . . . . . . . . . 10 |
10 | 9 | exp31 346 | . . . . . . . . 9 |
11 | 10 | rexlimdv 2432 | . . . . . . . 8 |
12 | 11 | biantrurd 289 | . . . . . . 7 |
13 | dfbi2 368 | . . . . . . 7 | |
14 | 12, 13 | syl6rbbr 188 | . . . . . 6 |
15 | 14 | albidv 1705 | . . . . 5 |
16 | abeq1 2147 | . . . . 5 | |
17 | df-ral 2311 | . . . . 5 | |
18 | 15, 16, 17 | 3bitr4g 212 | . . . 4 |
19 | 5, 18 | bitrd 177 | . . 3 |
20 | 19 | pm5.32i 427 | . 2 |
21 | 1, 20 | bitri 173 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wb 98 wal 1241 wceq 1243 wcel 1393 cab 2026 wral 2306 wrex 2307 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: dffo4 5315 foelrn 5317 foco2 5318 fcofo 5424 foov 5647 cnref1o 8582 |
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