iocmnfcld - Metamath Proof Explorer

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Theorem iocmnfcld 24698

Description: Left-unbounded closed intervals are closed sets of the standard topology on ℝ. (Contributed by Mario Carneiro, 17-Feb-2015.)

**Assertion**
Ref	Expression
iocmnfcld	⊢ (𝐴 ∈ ℝ → (-∞(,]𝐴) ∈ (Clsd‘(topGen‘ran (,))))

Proof of Theorem iocmnfcld Dummy variables 𝑥 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		mnfxr 11302	. . . . . . 7 ⊢ -∞ ∈ ℝ^*
2	1	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℝ → -∞ ∈ ℝ^*)
3		rexr 11291	. . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ^*)
4		pnfxr 11299	. . . . . . 7 ⊢ +∞ ∈ ℝ^*
5	4	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℝ → +∞ ∈ ℝ^*)
6		mnflt 13136	. . . . . 6 ⊢ (𝐴 ∈ ℝ → -∞ < 𝐴)
7		ltpnf 13133	. . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 < +∞)
8		df-ioc 13362	. . . . . . 7 ⊢ (,] = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥 < 𝑧 ∧ 𝑧 ≤ 𝑦)})
9		df-ioo 13361	. . . . . . 7 ⊢ (,) = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)})
10		xrltnle 11312	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴 < 𝑤 ↔ ¬ 𝑤 ≤ 𝐴))
11		xrlelttr 13168	. . . . . . 7 ⊢ ((𝑤 ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((𝑤 ≤ 𝐴 ∧ 𝐴 < +∞) → 𝑤 < +∞))
12		xrlttr 13152	. . . . . . 7 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → ((-∞ < 𝐴 ∧ 𝐴 < 𝑤) → -∞ < 𝑤))
13	8, 9, 10, 9, 11, 12	ixxun 13373	. . . . . 6 ⊢ (((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) ∧ (-∞ < 𝐴 ∧ 𝐴 < +∞)) → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = (-∞(,)+∞))
14	2, 3, 5, 6, 7, 13	syl32anc 1376	. . . . 5 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = (-∞(,)+∞))
15		ioomax 13432	. . . . 5 ⊢ (-∞(,)+∞) = ℝ
16	14, 15	eqtrdi 2784	. . . 4 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ)
17		iocssre 13437	. . . . . 6 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ) → (-∞(,]𝐴) ⊆ ℝ)
18	1, 17	mpan 689	. . . . 5 ⊢ (𝐴 ∈ ℝ → (-∞(,]𝐴) ⊆ ℝ)
19	8, 9, 10	ixxdisj 13372	. . . . . 6 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅)
20	1, 3, 5, 19	mp3an2i 1463	. . . . 5 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅)
21		uneqdifeq 4493	. . . . 5 ⊢ (((-∞(,]𝐴) ⊆ ℝ ∧ ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅) → (((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ ↔ (ℝ ∖ (-∞(,]𝐴)) = (𝐴(,)+∞)))
22	18, 20, 21	syl2anc 583	. . . 4 ⊢ (𝐴 ∈ ℝ → (((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ ↔ (ℝ ∖ (-∞(,]𝐴)) = (𝐴(,)+∞)))
23	16, 22	mpbid 231	. . 3 ⊢ (𝐴 ∈ ℝ → (ℝ ∖ (-∞(,]𝐴)) = (𝐴(,)+∞))
24		iooretop 24695	. . 3 ⊢ (𝐴(,)+∞) ∈ (topGen‘ran (,))
25	23, 24	eqeltrdi 2837	. 2 ⊢ (𝐴 ∈ ℝ → (ℝ ∖ (-∞(,]𝐴)) ∈ (topGen‘ran (,)))
26		retop 24691	. . 3 ⊢ (topGen‘ran (,)) ∈ Top
27		uniretop 24692	. . . 4 ⊢ ℝ = ∪ (topGen‘ran (,))
28	27	iscld2 22945	. . 3 ⊢ (((topGen‘ran (,)) ∈ Top ∧ (-∞(,]𝐴) ⊆ ℝ) → ((-∞(,]𝐴) ∈ (Clsd‘(topGen‘ran (,))) ↔ (ℝ ∖ (-∞(,]𝐴)) ∈ (topGen‘ran (,))))
29	26, 18, 28	sylancr 586	. 2 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∈ (Clsd‘(topGen‘ran (,))) ↔ (ℝ ∖ (-∞(,]𝐴)) ∈ (topGen‘ran (,))))
30	25, 29	mpbird 257	1 ⊢ (𝐴 ∈ ℝ → (-∞(,]𝐴) ∈ (Clsd‘(topGen‘ran (,))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 = wceq 1534 ∈ wcel 2099 ∖ cdif 3944 ∪ cun 3945 ∩ cin 3946 ⊆ wss 3947 ∅c0 4323 class class class wbr 5148 ran crn 5679 ‘cfv 6548 (class class class)co 7420 ℝcr 11138 +∞cpnf 11276 -∞cmnf 11277 ℝ^*cxr 11278 < clt 11279 ≤ cle 11280 (,)cioo 13357 (,]cioc 13358 topGenctg 17419 Topctop 22808 Clsdccld 22933

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 ax-pre-sup 11217

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-1st 7993 df-2nd 7994 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-er 8725 df-en 8965 df-dom 8966 df-sdom 8967 df-sup 9466 df-inf 9467 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-div 11903 df-nn 12244 df-n0 12504 df-z 12590 df-uz 12854 df-q 12964 df-ioo 13361 df-ioc 13362 df-topgen 17425 df-top 22809 df-bases 22862 df-cld 22936

This theorem is referenced by: logdmopn 26596 orvclteel 34092 dvasin 37177 dvacos 37178 dvreasin 37179 dvreacos 37180 rfcnpre4 44396

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