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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 2823 | . . 3 ⊢ ∅ = ∅ | |
2 | fn0 6481 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
3 | 1, 2 | mpbir 233 | . 2 ⊢ ∅ Fn ∅ |
4 | rn0 5798 | . . 3 ⊢ ran ∅ = ∅ | |
5 | 0ss 4352 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
6 | 4, 5 | eqsstri 4003 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
7 | df-f 6361 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
8 | 3, 6, 7 | mpbir2an 709 | 1 ⊢ ∅:∅⟶𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ⊆ wss 3938 ∅c0 4293 ran crn 5558 Fn wfn 6352 ⟶wf 6353 |
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 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-br 5069 df-opab 5131 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-fun 6359 df-fn 6360 df-f 6361 |
This theorem is referenced by: f00 6563 f0bi 6564 f10 6649 map0g 8450 ac6sfi 8764 oif 8996 wrd0 13891 0csh0 14157 ram0 16360 0ssc 17109 0subcat 17110 gsum0 17896 ga0 18430 0frgp 18907 ptcmpfi 22423 0met 22978 perfdvf 24503 uhgr0e 26858 uhgr0 26860 griedg0prc 27048 locfinref 31107 matunitlindf 34892 poimirlem28 34922 climlimsupcex 42057 0cnf 42167 dvnprodlem3 42240 sge00 42665 hoidmvlelem3 42886 |
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