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| Mirrors > Home > MPE Home > Th. List > f0 | Structured version Visualization version GIF version | ||
| Description: The empty function. (Contributed by NM, 14-Aug-1999.) |
| Ref | Expression |
|---|---|
| f0 | ⊢ ∅:∅⟶𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2760 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6670 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5907 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4349 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3954 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6542 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 724 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1569 ⊆ wss 3895 ∅c0 4278 ran crn 5651 Fn wfn 6533 ⟶wf 6534 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-mo 2564 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-sn 4585 df-pr 4587 df-op 4835 df-br 5103 df-opab 5167 df-id 5545 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-fun 6540 df-fn 6541 df-f 6542 |
| This theorem is used by: f00 6764 f0bi 6765 f10 6858 map0g 8915 ac6sfi 9278 oif 9527 wrd0 14687 0csh0 14948 ram0 17205 0ssc 18017 0subcat 18018 setc2ohom 18275 cat1lem 18276 gsum0 18878 ga0 19517 0frgp 19998 matunitlindf 23001 ptcmpfi 24137 0met 24690 perfdvf 26228 uhgr0e 29654 uhgr0 29656 griedg0prc 29850 0mplrim 34192 locfinref 34519 poimirlem28 38659 sticksstones11 43299 climlimsupcex 46872 0cnf 46980 dvnprodlem3 47051 sge00 47479 hoidmvlelem3 47700 |
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