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Mirrors > Home > MPE Home > Th. List > cls0 | Structured version Visualization version GIF version |
Description: The closure of the empty set. (Contributed by NM, 2-Oct-2007.) (Proof shortened by Jim Kingdon, 12-Mar-2023.) |
Ref | Expression |
---|---|
cls0 | ⊢ (𝐽 ∈ Top → ((cls‘𝐽)‘∅) = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0cld 22373 | . 2 ⊢ (𝐽 ∈ Top → ∅ ∈ (Clsd‘𝐽)) | |
2 | cldcls 22377 | . 2 ⊢ (∅ ∈ (Clsd‘𝐽) → ((cls‘𝐽)‘∅) = ∅) | |
3 | 1, 2 | syl 17 | 1 ⊢ (𝐽 ∈ Top → ((cls‘𝐽)‘∅) = ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2106 ∅c0 4280 ‘cfv 6493 Topctop 22226 Clsdccld 22351 clsccl 22353 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2707 ax-rep 5240 ax-sep 5254 ax-nul 5261 ax-pow 5318 ax-pr 5382 ax-un 7668 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2887 df-ne 2942 df-ral 3063 df-rex 3072 df-reu 3352 df-rab 3406 df-v 3445 df-sbc 3738 df-csb 3854 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4281 df-if 4485 df-pw 4560 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4864 df-int 4906 df-iun 4954 df-br 5104 df-opab 5166 df-mpt 5187 df-id 5529 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6445 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-top 22227 df-cld 22354 df-cls 22356 |
This theorem is referenced by: dfac14lem 22952 flimclslem 23319 |
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