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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 2737 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6631 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 231 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5883 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4354 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3982 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6504 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 712 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ⊆ wss 3903 ∅c0 4287 ran crn 5633 Fn wfn 6495 ⟶wf 6496 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pr 5379 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2540 df-clab 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-br 5101 df-opab 5163 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-fun 6502 df-fn 6503 df-f 6504 |
| This theorem is referenced by: f00 6724 f0bi 6725 f10 6815 map0g 8834 ac6sfi 9196 oif 9447 wrd0 14474 0csh0 14728 ram0 16962 0ssc 17773 0subcat 17774 setc2ohom 18031 cat1lem 18032 gsum0 18621 ga0 19239 0frgp 19720 ptcmpfi 23769 0met 24322 perfdvf 25872 uhgr0e 29156 uhgr0 29158 griedg0prc 29349 locfinref 34018 matunitlindf 37863 poimirlem28 37893 sticksstones11 42520 climlimsupcex 46121 0cnf 46229 dvnprodlem3 46300 sge00 46728 hoidmvlelem3 46949 |
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