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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 2766 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6673 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5921 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4360 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3986 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6547 | . 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 3908 ∅c0 4289 ran crn 5667 Fn wfn 6538 ⟶wf 6539 |
| 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 2148 ax-9 2156 ax-ext 2738 ax-sep 5262 ax-nul 5274 ax-pr 5409 |
| 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 2570 df-clab 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-id 5561 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-fun 6545 df-fn 6546 df-f 6547 |
| This theorem is used by: f00 6767 f0bi 6768 f10 6861 map0g 8891 ac6sfi 9254 oif 9502 wrd0 14596 0csh0 14856 ram0 17107 0ssc 17919 0subcat 17920 setc2ohom 18177 cat1lem 18178 gsum0 18771 ga0 19399 0frgp 19880 ptcmpfi 24007 0met 24560 perfdvf 26099 uhgr0e 29458 uhgr0 29460 griedg0prc 29651 0mplrim 33935 locfinref 34262 matunitlindf 38310 poimirlem28 38340 sticksstones11 42964 climlimsupcex 46524 0cnf 46632 dvnprodlem3 46703 sge00 47131 hoidmvlelem3 47352 |
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