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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 2798 | . . 3 ⊢ ∅ = ∅ | |
2 | fn0 6451 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
3 | 1, 2 | mpbir 234 | . 2 ⊢ ∅ Fn ∅ |
4 | rn0 5760 | . . 3 ⊢ ran ∅ = ∅ | |
5 | 0ss 4304 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
6 | 4, 5 | eqsstri 3949 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
7 | df-f 6328 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
8 | 3, 6, 7 | mpbir2an 710 | 1 ⊢ ∅:∅⟶𝐴 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ⊆ wss 3881 ∅c0 4243 ran crn 5520 Fn wfn 6319 ⟶wf 6320 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-v 3443 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-br 5031 df-opab 5093 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-fun 6326 df-fn 6327 df-f 6328 |
This theorem is referenced by: f00 6535 f0bi 6536 f10 6622 map0g 8431 ac6sfi 8746 oif 8978 wrd0 13882 0csh0 14146 ram0 16348 0ssc 17099 0subcat 17100 gsum0 17886 ga0 18420 0frgp 18897 ptcmpfi 22418 0met 22973 perfdvf 24506 uhgr0e 26864 uhgr0 26866 griedg0prc 27054 locfinref 31194 matunitlindf 35055 poimirlem28 35085 climlimsupcex 42411 0cnf 42519 dvnprodlem3 42590 sge00 43015 hoidmvlelem3 43236 |
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