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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 2740 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6623 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 232 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5875 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4335 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3968 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6496 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 717 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1547 ⊆ wss 3890 ∅c0 4268 ran crn 5626 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 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2712 ax-sep 5225 ax-nul 5235 ax-pr 5369 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-mo 2543 df-clab 2719 df-cleq 2732 df-clel 2815 df-ral 3055 df-rex 3065 df-rab 3393 df-v 3434 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4269 df-if 4462 df-sn 4563 df-pr 4565 df-op 4569 df-br 5080 df-opab 5142 df-id 5520 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-fun 6494 df-fn 6495 df-f 6496 |
| This theorem is referenced by: f00 6716 f0bi 6717 f10 6807 map0g 8829 ac6sfi 9191 oif 9442 wrd0 14499 0csh0 14753 ram0 16991 0ssc 17802 0subcat 17803 setc2ohom 18060 cat1lem 18061 gsum0 18650 ga0 19271 0frgp 19752 ptcmpfi 23803 0met 24356 perfdvf 25895 uhgr0e 29165 uhgr0 29167 griedg0prc 29358 0mplrim 33705 locfinref 34032 matunitlindf 37992 poimirlem28 38022 sticksstones11 42648 climlimsupcex 46219 0cnf 46327 dvnprodlem3 46398 sge00 46826 hoidmvlelem3 47047 |
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