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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 2761 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6670 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5908 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4350 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3977 | . 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 1570 ⊆ wss 3899 ∅c0 4279 ran crn 5652 Fn wfn 6533 ⟶wf 6534 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 |
| 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 2565 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-fun 6540 df-fn 6541 df-f 6542 |
| This theorem is used by: f00 6764 f0bi 6765 f10 6858 map0g 8912 ac6sfi 9275 oif 9524 wrd0 14684 0csh0 14944 ram0 17200 0ssc 18012 0subcat 18013 setc2ohom 18270 cat1lem 18271 gsum0 18873 ga0 19512 0frgp 19993 matunitlindf 22996 ptcmpfi 24132 0met 24685 perfdvf 26223 uhgr0e 29649 uhgr0 29651 griedg0prc 29845 0mplrim 34146 locfinref 34473 poimirlem28 38566 sticksstones11 43206 climlimsupcex 46778 0cnf 46886 dvnprodlem3 46957 sge00 47385 hoidmvlelem3 47606 |
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