Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > f0dom0 | Unicode version |
Description: A function is empty iff it has an empty domain. (Contributed by AV, 10-Feb-2019.) |
Ref | Expression |
---|---|
f0dom0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | feq2 5226 | . . . 4 | |
2 | f0bi 5285 | . . . . 5 | |
3 | 2 | biimpi 119 | . . . 4 |
4 | 1, 3 | syl6bi 162 | . . 3 |
5 | 4 | com12 30 | . 2 |
6 | feq1 5225 | . . . 4 | |
7 | dm0 4723 | . . . . 5 | |
8 | fdm 5248 | . . . . 5 | |
9 | 7, 8 | syl5reqr 2165 | . . . 4 |
10 | 6, 9 | syl6bi 162 | . . 3 |
11 | 10 | com12 30 | . 2 |
12 | 5, 11 | impbid 128 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wceq 1316 c0 3333 cdm 4509 wf 5089 |
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 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-sep 4016 ax-nul 4024 ax-pow 4068 ax-pr 4101 |
This theorem depends on definitions: df-bi 116 df-3an 949 df-tru 1319 df-fal 1322 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ral 2398 df-rex 2399 df-v 2662 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-br 3900 df-opab 3960 df-id 4185 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-fun 5095 df-fn 5096 df-f 5097 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |