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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 2761 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6648 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 233 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5900 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4353 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3982 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6521 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 721 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1559 ⊆ wss 3904 ∅c0 4285 ran crn 5646 Fn wfn 6512 ⟶wf 6513 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pr 5389 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-mo 2565 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4480 df-sn 4582 df-pr 4584 df-op 4588 df-br 5100 df-opab 5162 df-id 5540 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-fun 6519 df-fn 6520 df-f 6521 |
| This theorem is referenced by: f00 6742 f0bi 6743 f10 6836 map0g 8862 ac6sfi 9224 oif 9475 wrd0 14549 0csh0 14803 ram0 17041 0ssc 17853 0subcat 17854 setc2ohom 18111 cat1lem 18112 gsum0 18701 ga0 19321 0frgp 19802 ptcmpfi 23853 0met 24406 perfdvf 25945 uhgr0e 29218 uhgr0 29220 griedg0prc 29411 0mplrim 33772 locfinref 34099 matunitlindf 38081 poimirlem28 38111 sticksstones11 42737 climlimsupcex 46307 0cnf 46415 dvnprodlem3 46486 sge00 46914 hoidmvlelem3 47135 |
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