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Mirrors > Home > ILE Home > Th. List > f0 | GIF version |
Description: The empty function. (Contributed by NM, 14-Aug-1999.) |
Ref | Expression |
---|---|
f0 | ⊢ ∅:∅⟶𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2140 | . . 3 ⊢ ∅ = ∅ | |
2 | fn0 5250 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
3 | 1, 2 | mpbir 145 | . 2 ⊢ ∅ Fn ∅ |
4 | rn0 4803 | . . 3 ⊢ ran ∅ = ∅ | |
5 | 0ss 3406 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
6 | 4, 5 | eqsstri 3134 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
7 | df-f 5135 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
8 | 3, 6, 7 | mpbir2an 927 | 1 ⊢ ∅:∅⟶𝐴 |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 ⊆ wss 3076 ∅c0 3368 ran crn 4548 Fn wfn 5126 ⟶wf 5127 |
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 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-br 3938 df-opab 3998 df-id 4223 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-fun 5133 df-fn 5134 df-f 5135 |
This theorem is referenced by: f00 5322 f0bi 5323 f10 5409 map0g 6590 ac6sfi 6800 0met 12592 |
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