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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 2736 | . . 3 ⊢ ∅ = ∅ | |
| 2 | fn0 6629 | . . 3 ⊢ (∅ Fn ∅ ↔ ∅ = ∅) | |
| 3 | 1, 2 | mpbir 231 | . 2 ⊢ ∅ Fn ∅ |
| 4 | rn0 5881 | . . 3 ⊢ ran ∅ = ∅ | |
| 5 | 0ss 4340 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
| 6 | 4, 5 | eqsstri 3968 | . 2 ⊢ ran ∅ ⊆ 𝐴 |
| 7 | df-f 6502 | . 2 ⊢ (∅:∅⟶𝐴 ↔ (∅ Fn ∅ ∧ ran ∅ ⊆ 𝐴)) | |
| 8 | 3, 6, 7 | mpbir2an 712 | 1 ⊢ ∅:∅⟶𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1542 ⊆ wss 3889 ∅c0 4273 ran crn 5632 Fn wfn 6493 ⟶wf 6494 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2539 df-clab 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-br 5086 df-opab 5148 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-fun 6500 df-fn 6501 df-f 6502 |
| This theorem is referenced by: f00 6722 f0bi 6723 f10 6813 map0g 8832 ac6sfi 9194 oif 9445 wrd0 14501 0csh0 14755 ram0 16993 0ssc 17804 0subcat 17805 setc2ohom 18062 cat1lem 18063 gsum0 18652 ga0 19273 0frgp 19754 ptcmpfi 23778 0met 24331 perfdvf 25870 uhgr0e 29140 uhgr0 29142 griedg0prc 29333 locfinref 33985 matunitlindf 37939 poimirlem28 37969 sticksstones11 42595 climlimsupcex 46197 0cnf 46305 dvnprodlem3 46376 sge00 46804 hoidmvlelem3 47025 |
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