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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 6662 | . . 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 6535 | . 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 6526 ⟶wf 6527 |
| 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 6533 df-fn 6534 df-f 6535 |
| This theorem is used by: f00 6756 f0bi 6757 f10 6850 map0g 8896 ac6sfi 9259 oif 9508 wrd0 14664 0csh0 14924 ram0 17180 0ssc 17992 0subcat 17993 setc2ohom 18250 cat1lem 18251 gsum0 18853 ga0 19492 0frgp 19973 matunitlindf 22976 ptcmpfi 24112 0met 24665 perfdvf 26203 uhgr0e 29631 uhgr0 29633 griedg0prc 29827 0mplrim 34128 locfinref 34455 poimirlem28 38534 sticksstones11 43174 climlimsupcex 46723 0cnf 46831 dvnprodlem3 46902 sge00 47330 hoidmvlelem3 47551 |
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