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| Mirrors > Home > MPE Home > Th. List > icccld | Structured version Visualization version GIF version | ||
| Description: Closed intervals are closed sets of the standard topology on ℝ. (Contributed by FL, 14-Sep-2007.) |
| Ref | Expression |
|---|---|
| icccld | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ∈ (Clsd‘(topGen‘ran (,)))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | difreicc 13375 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (ℝ ∖ (𝐴[,]𝐵)) = ((-∞(,)𝐴) ∪ (𝐵(,)+∞))) | |
| 2 | retop 24630 | . . . 4 ⊢ (topGen‘ran (,)) ∈ Top | |
| 3 | iooretop 24634 | . . . 4 ⊢ (-∞(,)𝐴) ∈ (topGen‘ran (,)) | |
| 4 | iooretop 24634 | . . . 4 ⊢ (𝐵(,)+∞) ∈ (topGen‘ran (,)) | |
| 5 | unopn 22772 | . . . 4 ⊢ (((topGen‘ran (,)) ∈ Top ∧ (-∞(,)𝐴) ∈ (topGen‘ran (,)) ∧ (𝐵(,)+∞) ∈ (topGen‘ran (,))) → ((-∞(,)𝐴) ∪ (𝐵(,)+∞)) ∈ (topGen‘ran (,))) | |
| 6 | 2, 3, 4, 5 | mp3an 1463 | . . 3 ⊢ ((-∞(,)𝐴) ∪ (𝐵(,)+∞)) ∈ (topGen‘ran (,)) |
| 7 | 1, 6 | eqeltrdi 2836 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (ℝ ∖ (𝐴[,]𝐵)) ∈ (topGen‘ran (,))) |
| 8 | iccssre 13320 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ) | |
| 9 | uniretop 24631 | . . . 4 ⊢ ℝ = ∪ (topGen‘ran (,)) | |
| 10 | 9 | iscld2 22897 | . . 3 ⊢ (((topGen‘ran (,)) ∈ Top ∧ (𝐴[,]𝐵) ⊆ ℝ) → ((𝐴[,]𝐵) ∈ (Clsd‘(topGen‘ran (,))) ↔ (ℝ ∖ (𝐴[,]𝐵)) ∈ (topGen‘ran (,)))) |
| 11 | 2, 8, 10 | sylancr 587 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝐴[,]𝐵) ∈ (Clsd‘(topGen‘ran (,))) ↔ (ℝ ∖ (𝐴[,]𝐵)) ∈ (topGen‘ran (,)))) |
| 12 | 7, 11 | mpbird 257 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ∈ (Clsd‘(topGen‘ran (,)))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∈ wcel 2109 ∖ cdif 3896 ∪ cun 3897 ⊆ wss 3899 ran crn 5614 ‘cfv 6476 (class class class)co 7340 ℝcr 10996 +∞cpnf 11134 -∞cmnf 11135 (,)cioo 13236 [,]cicc 13239 topGenctg 17328 Topctop 22762 Clsdccld 22885 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5231 ax-nul 5241 ax-pow 5300 ax-pr 5367 ax-un 7662 ax-cnex 11053 ax-resscn 11054 ax-1cn 11055 ax-icn 11056 ax-addcl 11057 ax-addrcl 11058 ax-mulcl 11059 ax-mulrcl 11060 ax-mulcom 11061 ax-addass 11062 ax-mulass 11063 ax-distr 11064 ax-i2m1 11065 ax-1ne0 11066 ax-1rid 11067 ax-rnegex 11068 ax-rrecex 11069 ax-cnre 11070 ax-pre-lttri 11071 ax-pre-lttrn 11072 ax-pre-ltadd 11073 ax-pre-mulgt0 11074 ax-pre-sup 11075 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3343 df-reu 3344 df-rab 3393 df-v 3435 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4940 df-br 5089 df-opab 5151 df-mpt 5170 df-tr 5196 df-id 5508 df-eprel 5513 df-po 5521 df-so 5522 df-fr 5566 df-we 5568 df-xp 5619 df-rel 5620 df-cnv 5621 df-co 5622 df-dm 5623 df-rn 5624 df-res 5625 df-ima 5626 df-pred 6243 df-ord 6304 df-on 6305 df-lim 6306 df-suc 6307 df-iota 6432 df-fun 6478 df-fn 6479 df-f 6480 df-f1 6481 df-fo 6482 df-f1o 6483 df-fv 6484 df-riota 7297 df-ov 7343 df-oprab 7344 df-mpo 7345 df-om 7791 df-1st 7915 df-2nd 7916 df-frecs 8205 df-wrecs 8236 df-recs 8285 df-rdg 8323 df-er 8616 df-en 8864 df-dom 8865 df-sdom 8866 df-sup 9320 df-inf 9321 df-pnf 11139 df-mnf 11140 df-xr 11141 df-ltxr 11142 df-le 11143 df-sub 11337 df-neg 11338 df-div 11766 df-nn 12117 df-n0 12373 df-z 12460 df-uz 12724 df-q 12838 df-ioo 13240 df-icc 13243 df-topgen 17334 df-top 22763 df-bases 22815 df-cld 22888 |
| This theorem is referenced by: cnmpopc 24803 cvmliftlem10 35284 mblfinlem1 37654 mblfinlem2 37655 icccmpALT 37838 |
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