iocmnfcld - Metamath Proof Explorer

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Theorem iocmnfcld 24636

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 11272	. . . . . . 7 ⊢ -∞ ∈ ℝ^*
2	1	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℝ → -∞ ∈ ℝ^*)
3		rexr 11261	. . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ^*)
4		pnfxr 11269	. . . . . . 7 ⊢ +∞ ∈ ℝ^*
5	4	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℝ → +∞ ∈ ℝ^*)
6		mnflt 13106	. . . . . 6 ⊢ (𝐴 ∈ ℝ → -∞ < 𝐴)
7		ltpnf 13103	. . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 < +∞)
8		df-ioc 13332	. . . . . . 7 ⊢ (,] = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥 < 𝑧 ∧ 𝑧 ≤ 𝑦)})
9		df-ioo 13331	. . . . . . 7 ⊢ (,) = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)})
10		xrltnle 11282	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴 < 𝑤 ↔ ¬ 𝑤 ≤ 𝐴))
11		xrlelttr 13138	. . . . . . 7 ⊢ ((𝑤 ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((𝑤 ≤ 𝐴 ∧ 𝐴 < +∞) → 𝑤 < +∞))
12		xrlttr 13122	. . . . . . 7 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → ((-∞ < 𝐴 ∧ 𝐴 < 𝑤) → -∞ < 𝑤))
13	8, 9, 10, 9, 11, 12	ixxun 13343	. . . . . 6 ⊢ (((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) ∧ (-∞ < 𝐴 ∧ 𝐴 < +∞)) → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = (-∞(,)+∞))
14	2, 3, 5, 6, 7, 13	syl32anc 1375	. . . . 5 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = (-∞(,)+∞))
15		ioomax 13402	. . . . 5 ⊢ (-∞(,)+∞) = ℝ
16	14, 15	eqtrdi 2782	. . . 4 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ)
17		iocssre 13407	. . . . . 6 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ) → (-∞(,]𝐴) ⊆ ℝ)
18	1, 17	mpan 687	. . . . 5 ⊢ (𝐴 ∈ ℝ → (-∞(,]𝐴) ⊆ ℝ)
19	8, 9, 10	ixxdisj 13342	. . . . . 6 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅)
20	1, 3, 5, 19	mp3an2i 1462	. . . . 5 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅)
21		uneqdifeq 4487	. . . . 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 24633	. . 3 ⊢ (𝐴(,)+∞) ∈ (topGen‘ran (,))
25	23, 24	eqeltrdi 2835	. 2 ⊢ (𝐴 ∈ ℝ → (ℝ ∖ (-∞(,]𝐴)) ∈ (topGen‘ran (,)))
26		retop 24629	. . 3 ⊢ (topGen‘ran (,)) ∈ Top
27		uniretop 24630	. . . 4 ⊢ ℝ = ∪ (topGen‘ran (,))
28	27	iscld2 22883	. . 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 1533 ∈ wcel 2098 ∖ cdif 3940 ∪ cun 3941 ∩ cin 3942 ⊆ wss 3943 ∅c0 4317 class class class wbr 5141 ran crn 5670 ‘cfv 6536 (class class class)co 7404 ℝcr 11108 +∞cpnf 11246 -∞cmnf 11247 ℝ^*cxr 11248 < clt 11249 ≤ cle 11250 (,)cioo 13327 (,]cioc 13328 topGenctg 17390 Topctop 22746 Clsdccld 22871

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 ax-pre-sup 11187

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6293 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8264 df-wrecs 8295 df-recs 8369 df-rdg 8408 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-sup 9436 df-inf 9437 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11447 df-neg 11448 df-div 11873 df-nn 12214 df-n0 12474 df-z 12560 df-uz 12824 df-q 12934 df-ioo 13331 df-ioc 13332 df-topgen 17396 df-top 22747 df-bases 22800 df-cld 22874

This theorem is referenced by: logdmopn 26534 orvclteel 34001 dvasin 37083 dvacos 37084 dvreasin 37085 dvreacos 37086 rfcnpre4 44275

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