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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 2821 | . . 3 ⊢ ∅ = ∅ | |
2 | fn0 6479 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
3 | 1, 2 | mpbir 233 | . 2 ⊢ ∅ Fn ∅ |
4 | rn0 5796 | . . 3 ⊢ ran ∅ = ∅ | |
5 | 0ss 4350 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
6 | 4, 5 | eqsstri 4001 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
7 | df-f 6359 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
8 | 3, 6, 7 | mpbir2an 709 | 1 ⊢ ∅:∅⟶𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ⊆ wss 3936 ∅c0 4291 ran crn 5556 Fn wfn 6350 ⟶wf 6351 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pr 5330 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-sn 4568 df-pr 4570 df-op 4574 df-br 5067 df-opab 5129 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-fun 6357 df-fn 6358 df-f 6359 |
This theorem is referenced by: f00 6561 f0bi 6562 f10 6647 map0g 8448 ac6sfi 8762 oif 8994 wrd0 13889 0csh0 14155 ram0 16358 0ssc 17107 0subcat 17108 gsum0 17894 ga0 18428 0frgp 18905 ptcmpfi 22421 0met 22976 perfdvf 24501 uhgr0e 26856 uhgr0 26858 griedg0prc 27046 locfinref 31105 matunitlindf 34905 poimirlem28 34935 climlimsupcex 42099 0cnf 42209 dvnprodlem3 42282 sge00 42707 hoidmvlelem3 42928 |
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