| Metamath Proof Explorer |
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Related theorems Unicode version |
| Description: An empty domain implies an empty range. |
| Ref | Expression |
|---|---|
| dm0rn0 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | excom 1044 |
. . . . . 6
| |
| 2 | 1 | negbii 187 |
. . . . 5
|
| 3 | alnex 1031 |
. . . . 5
| |
| 4 | alnex 1031 |
. . . . 5
| |
| 5 | 2, 3, 4 | 3bitr4 183 |
. . . 4
|
| 6 | noel 2280 |
. . . . . 6
| |
| 7 | 6 | nbn 721 |
. . . . 5
|
| 8 | 7 | albii 997 |
. . . 4
|
| 9 | noel 2280 |
. . . . . 6
| |
| 10 | 9 | nbn 721 |
. . . . 5
|
| 11 | 10 | albii 997 |
. . . 4
|
| 12 | 5, 8, 11 | 3bitr3 181 |
. . 3
|
| 13 | abeq1 1566 |
. . 3
| |
| 14 | abeq1 1566 |
. . 3
| |
| 15 | 12, 13, 14 | 3bitr4 183 |
. 2
|
| 16 | df-dm 3183 |
. . 3
| |
| 17 | 16 | eqeq1i 1479 |
. 2
|
| 18 | dfrn2 3298 |
. . 3
| |
| 19 | 18 | eqeq1i 1479 |
. 2
|
| 20 | 15, 17, 19 | 3bitr4 183 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: rn0 3349 relrn0 3350 imadisj 3414 ndmima 3426 f00 3648 2nd0 4074 map0b 4333 fodomfib 4547 noinfep 4620 fodomb 4780 fseqsupcl 6465 fseqsupub 6466 climsup 7099 cvgcmpub 7129 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-sep 2698 ax-pow 2737 ax-pr 2774 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-br 2615 df-opab 2662 df-cnv 3181 df-dm 3183 df-rn 3184 |