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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 6623 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 231 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5875 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4341 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3969 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6496 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 712 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ⊆ wss 3890 ∅c0 4274 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 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pr 5370 |
| 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 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-br 5087 df-opab 5149 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 8825 ac6sfi 9187 oif 9438 wrd0 14492 0csh0 14746 ram0 16984 0ssc 17795 0subcat 17796 setc2ohom 18053 cat1lem 18054 gsum0 18643 ga0 19264 0frgp 19745 ptcmpfi 23788 0met 24341 perfdvf 25880 uhgr0e 29154 uhgr0 29156 griedg0prc 29347 locfinref 34001 matunitlindf 37953 poimirlem28 37983 sticksstones11 42609 climlimsupcex 46215 0cnf 46323 dvnprodlem3 46394 sge00 46822 hoidmvlelem3 47043 |
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