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Mirrors > Home > ILE Home > Th. List > dm0rn0 | Unicode version |
Description: An empty domain implies an empty range. (Contributed by NM, 21-May-1998.) |
Ref | Expression |
---|---|
dm0rn0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alnex 1388 | . . . . . 6 | |
2 | excom 1554 | . . . . . 6 | |
3 | 1, 2 | xchbinx 607 | . . . . 5 |
4 | alnex 1388 | . . . . 5 | |
5 | 3, 4 | bitr4i 176 | . . . 4 |
6 | noel 3228 | . . . . . 6 | |
7 | 6 | nbn 615 | . . . . 5 |
8 | 7 | albii 1359 | . . . 4 |
9 | noel 3228 | . . . . . 6 | |
10 | 9 | nbn 615 | . . . . 5 |
11 | 10 | albii 1359 | . . . 4 |
12 | 5, 8, 11 | 3bitr3i 199 | . . 3 |
13 | abeq1 2147 | . . 3 | |
14 | abeq1 2147 | . . 3 | |
15 | 12, 13, 14 | 3bitr4i 201 | . 2 |
16 | df-dm 4355 | . . 3 | |
17 | 16 | eqeq1i 2047 | . 2 |
18 | dfrn2 4523 | . . 3 | |
19 | 18 | eqeq1i 2047 | . 2 |
20 | 15, 17, 19 | 3bitr4i 201 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wb 98 wal 1241 wceq 1243 wex 1381 wcel 1393 cab 2026 c0 3224 class class class wbr 3764 cdm 4345 crn 4346 |
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-in1 544 ax-in2 545 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-fal 1249 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-v 2559 df-dif 2920 df-un 2922 df-in 2924 df-ss 2931 df-nul 3225 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-br 3765 df-opab 3819 df-cnv 4353 df-dm 4355 df-rn 4356 |
This theorem is referenced by: rn0 4588 relrn0 4594 imadisj 4687 ndmima 4702 f00 5081 2nd0 5772 |
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