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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 2736 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6623 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 231 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5875 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4352 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3980 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6496 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 711 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1541 ⊆ wss 3901 ∅c0 4285 ran crn 5625 Fn wfn 6487 ⟶wf 6488 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-mo 2539 df-clab 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-br 5099 df-opab 5161 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-fun 6494 df-fn 6495 df-f 6496 |
| This theorem is referenced by: f00 6716 f0bi 6717 f10 6807 map0g 8822 ac6sfi 9184 oif 9435 wrd0 14462 0csh0 14716 ram0 16950 0ssc 17761 0subcat 17762 setc2ohom 18019 cat1lem 18020 gsum0 18609 ga0 19227 0frgp 19708 ptcmpfi 23757 0met 24310 perfdvf 25860 uhgr0e 29144 uhgr0 29146 griedg0prc 29337 locfinref 33998 matunitlindf 37815 poimirlem28 37845 sticksstones11 42406 climlimsupcex 46009 0cnf 46117 dvnprodlem3 46188 sge00 46616 hoidmvlelem3 46837 |
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