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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 2231 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 5452 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 146 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 4988 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 3533 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3259 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 5330 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 950 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1397 ⊆ wss 3200 ∅c0 3494 ran crn 4726 Fn wfn 5321 ⟶wf 5322 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-br 4089 df-opab 4151 df-id 4390 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-fun 5328 df-fn 5329 df-f 5330 |
| This theorem is referenced by: f00 5528 f0bi 5529 f10 5618 map0g 6857 ac6sfi 7087 wrd0 11142 gsum0g 13484 0met 15114 uhgr0e 15939 uhgr0 15942 griedg0prc 16107 gfsum0 16708 |
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