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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 2763 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6668 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5918 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4358 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3984 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6542 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 723 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1570 ⊆ wss 3906 ∅c0 4287 ran crn 5664 Fn wfn 6533 ⟶wf 6534 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5258 ax-nul 5270 ax-pr 5406 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-mo 2567 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4489 df-sn 4591 df-pr 4593 df-op 4597 df-br 5111 df-opab 5175 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-fun 6540 df-fn 6541 df-f 6542 |
| This theorem is referenced by: f00 6762 f0bi 6763 f10 6856 map0g 8883 ac6sfi 9245 oif 9493 wrd0 14578 0csh0 14832 ram0 17083 0ssc 17895 0subcat 17896 setc2ohom 18153 cat1lem 18154 gsum0 18743 ga0 19369 0frgp 19850 ptcmpfi 23951 0met 24504 perfdvf 26043 uhgr0e 29399 uhgr0 29401 griedg0prc 29592 0mplrim 33882 locfinref 34209 matunitlindf 38247 poimirlem28 38277 sticksstones11 42901 climlimsupcex 46463 0cnf 46571 dvnprodlem3 46642 sge00 47070 hoidmvlelem3 47291 |
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