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| Mirrors > Home > ILE Home > Th. List > f0 | Unicode version | ||
| Description: The empty function. (Contributed by NM, 14-Aug-1999.) |
| Ref | Expression |
|---|---|
| f0 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2207 |
. . 3
| |
| 2 | fn0 5415 |
. . 3
| |
| 3 | 1, 2 | mpbir 146 |
. 2
|
| 4 | rn0 4953 |
. . 3
| |
| 5 | 0ss 3507 |
. . 3
| |
| 6 | 4, 5 | eqsstri 3233 |
. 2
|
| 7 | df-f 5294 |
. 2
| |
| 8 | 3, 6, 7 | mpbir2an 945 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-14 2181 ax-ext 2189 ax-sep 4178 ax-nul 4186 ax-pow 4234 ax-pr 4269 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ral 2491 df-rex 2492 df-v 2778 df-dif 3176 df-un 3178 df-in 3180 df-ss 3187 df-nul 3469 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-br 4060 df-opab 4122 df-id 4358 df-xp 4699 df-rel 4700 df-cnv 4701 df-co 4702 df-dm 4703 df-rn 4704 df-fun 5292 df-fn 5293 df-f 5294 |
| This theorem is referenced by: f00 5489 f0bi 5490 f10 5578 map0g 6798 ac6sfi 7021 wrd0 11056 gsum0g 13343 0met 14971 uhgr0e 15793 uhgr0 15796 |
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