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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 2762 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6667 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5914 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4353 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3980 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6541 | . 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 1570 ⊆ wss 3902 ∅c0 4282 ran crn 5660 Fn wfn 6532 ⟶wf 6533 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pr 5402 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-mo 2566 df-clab 2741 df-cleq 2754 df-clel 2837 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-sn 4588 df-pr 4590 df-op 4594 df-br 5108 df-opab 5172 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-fun 6539 df-fn 6540 df-f 6541 |
| This theorem is used by: f00 6761 f0bi 6762 f10 6855 map0g 8895 ac6sfi 9258 oif 9506 wrd0 14608 0csh0 14868 ram0 17120 0ssc 17932 0subcat 17933 setc2ohom 18190 cat1lem 18191 gsum0 18792 ga0 19431 0frgp 19912 matunitlindf 22909 ptcmpfi 24045 0met 24598 perfdvf 26137 uhgr0e 29536 uhgr0 29538 griedg0prc 29732 0mplrim 34032 locfinref 34359 poimirlem28 38405 sticksstones11 43030 climlimsupcex 46605 0cnf 46713 dvnprodlem3 46784 sge00 47212 hoidmvlelem3 47433 |
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