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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 2765 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6656 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5907 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4357 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3985 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6529 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 723 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1563 ⊆ wss 3907 ∅c0 4288 ran crn 5653 Fn wfn 6520 ⟶wf 6521 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pr 5395 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-sb 2094 df-mo 2569 df-clab 2744 df-cleq 2757 df-clel 2840 df-ral 3080 df-rex 3090 df-rab 3418 df-v 3459 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-nul 4289 df-if 4484 df-sn 4586 df-pr 4588 df-op 4592 df-br 5106 df-opab 5168 df-id 5547 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-fun 6527 df-fn 6528 df-f 6529 |
| This theorem is referenced by: f00 6750 f0bi 6751 f10 6844 map0g 8870 ac6sfi 9232 oif 9480 wrd0 14566 0csh0 14820 ram0 17072 0ssc 17884 0subcat 17885 setc2ohom 18142 cat1lem 18143 gsum0 18732 ga0 19359 0frgp 19840 ptcmpfi 23931 0met 24484 perfdvf 26023 uhgr0e 29330 uhgr0 29332 griedg0prc 29523 0mplrim 33821 locfinref 34148 matunitlindf 38129 poimirlem28 38159 sticksstones11 42785 climlimsupcex 46341 0cnf 46449 dvnprodlem3 46520 sge00 46948 hoidmvlelem3 47169 |
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