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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 22963 | . 2 ⊢ (𝐽 ∈ Top → ∅ ∈ (Clsd‘𝐽)) | |
| 2 | cldcls 22967 | . 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 2113 ∅c0 4284 ‘cfv 6489 Topctop 22818 Clsdccld 22941 clsccl 22943 |
| 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 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7677 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2883 df-ne 2931 df-ral 3050 df-rex 3059 df-reu 3349 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4285 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-int 4900 df-iun 4945 df-br 5096 df-opab 5158 df-mpt 5177 df-id 5516 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-f1 6494 df-fo 6495 df-f1o 6496 df-fv 6497 df-top 22819 df-cld 22944 df-cls 22946 |
| This theorem is referenced by: dfac14lem 23542 flimclslem 23909 |
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