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Mirrors > Home > ILE Home > Th. List > 0fv | Unicode version |
Description: Function value of the empty set. (Contributed by Stefan O'Rear, 26-Nov-2014.) |
Ref | Expression |
---|---|
0fv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-fv 4930 | . 2 | |
2 | noel 3255 | . . . . . 6 | |
3 | df-br 3786 | . . . . . 6 | |
4 | 2, 3 | mtbir 628 | . . . . 5 |
5 | 4 | nex 1429 | . . . 4 |
6 | euex 1971 | . . . 4 | |
7 | 5, 6 | mto 620 | . . 3 |
8 | iotanul 4902 | . . 3 | |
9 | 7, 8 | ax-mp 7 | . 2 |
10 | 1, 9 | eqtri 2101 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wceq 1284 wex 1421 wcel 1433 weu 1941 c0 3251 cop 3401 class class class wbr 3785 cio 4885 cfv 4922 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-rex 2354 df-v 2603 df-dif 2975 df-in 2979 df-ss 2986 df-nul 3252 df-sn 3404 df-uni 3602 df-br 3786 df-iota 4887 df-fv 4930 |
This theorem is referenced by: (None) |
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