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Mirrors > Home > ILE Home > Th. List > dm0rn0 | Unicode version |
Description: An empty domain implies an empty range. For a similar theorem for whether the domain and range are inhabited, see dmmrnm 4758. (Contributed by NM, 21-May-1998.) |
Ref | Expression |
---|---|
dm0rn0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alnex 1475 | . . . . . 6 | |
2 | excom 1642 | . . . . . 6 | |
3 | 1, 2 | xchbinx 671 | . . . . 5 |
4 | alnex 1475 | . . . . 5 | |
5 | 3, 4 | bitr4i 186 | . . . 4 |
6 | noel 3367 | . . . . . 6 | |
7 | 6 | nbn 688 | . . . . 5 |
8 | 7 | albii 1446 | . . . 4 |
9 | noel 3367 | . . . . . 6 | |
10 | 9 | nbn 688 | . . . . 5 |
11 | 10 | albii 1446 | . . . 4 |
12 | 5, 8, 11 | 3bitr3i 209 | . . 3 |
13 | abeq1 2249 | . . 3 | |
14 | abeq1 2249 | . . 3 | |
15 | 12, 13, 14 | 3bitr4i 211 | . 2 |
16 | df-dm 4549 | . . 3 | |
17 | 16 | eqeq1i 2147 | . 2 |
18 | dfrn2 4727 | . . 3 | |
19 | 18 | eqeq1i 2147 | . 2 |
20 | 15, 17, 19 | 3bitr4i 211 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wb 104 wal 1329 wceq 1331 wex 1468 wcel 1480 cab 2125 c0 3363 class class class wbr 3929 cdm 4539 crn 4540 |
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-in1 603 ax-in2 604 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-fal 1337 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-v 2688 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-br 3930 df-opab 3990 df-cnv 4547 df-dm 4549 df-rn 4550 |
This theorem is referenced by: rn0 4795 relrn0 4801 imadisj 4901 ndmima 4916 f00 5314 f0rn0 5317 2nd0 6043 map0b 6581 |
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