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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 6624 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 231 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5876 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4353 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3981 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6497 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 712 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ⊆ wss 3902 ∅c0 4286 ran crn 5626 Fn wfn 6488 ⟶wf 6489 |
| 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 5242 ax-nul 5252 ax-pr 5378 |
| 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 3062 df-rab 3401 df-v 3443 df-dif 3905 df-un 3907 df-ss 3919 df-nul 4287 df-if 4481 df-sn 4582 df-pr 4584 df-op 4588 df-br 5100 df-opab 5162 df-id 5520 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-fun 6495 df-fn 6496 df-f 6497 |
| This theorem is referenced by: f00 6717 f0bi 6718 f10 6808 map0g 8826 ac6sfi 9188 oif 9439 wrd0 14466 0csh0 14720 ram0 16954 0ssc 17765 0subcat 17766 setc2ohom 18023 cat1lem 18024 gsum0 18613 ga0 19231 0frgp 19712 ptcmpfi 23761 0met 24314 perfdvf 25864 uhgr0e 29127 uhgr0 29129 griedg0prc 29320 locfinref 33979 matunitlindf 37790 poimirlem28 37820 sticksstones11 42447 climlimsupcex 46049 0cnf 46157 dvnprodlem3 46228 sge00 46656 hoidmvlelem3 46877 |
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