iocmnfcld - Metamath Proof Explorer

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Theorem iocmnfcld 24170

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 11222	. . . . . . 7 ⊢ -∞ ∈ ℝ^*
2	1	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℝ → -∞ ∈ ℝ^*)
3		rexr 11211	. . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ^*)
4		pnfxr 11219	. . . . . . 7 ⊢ +∞ ∈ ℝ^*
5	4	a1i 11	. . . . . 6 ⊢ (𝐴 ∈ ℝ → +∞ ∈ ℝ^*)
6		mnflt 13054	. . . . . 6 ⊢ (𝐴 ∈ ℝ → -∞ < 𝐴)
7		ltpnf 13051	. . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 < +∞)
8		df-ioc 13280	. . . . . . 7 ⊢ (,] = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥 < 𝑧 ∧ 𝑧 ≤ 𝑦)})
9		df-ioo 13279	. . . . . . 7 ⊢ (,) = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)})
10		xrltnle 11232	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴 < 𝑤 ↔ ¬ 𝑤 ≤ 𝐴))
11		xrlelttr 13086	. . . . . . 7 ⊢ ((𝑤 ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((𝑤 ≤ 𝐴 ∧ 𝐴 < +∞) → 𝑤 < +∞))
12		xrlttr 13070	. . . . . . 7 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → ((-∞ < 𝐴 ∧ 𝐴 < 𝑤) → -∞ < 𝑤))
13	8, 9, 10, 9, 11, 12	ixxun 13291	. . . . . 6 ⊢ (((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) ∧ (-∞ < 𝐴 ∧ 𝐴 < +∞)) → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = (-∞(,)+∞))
14	2, 3, 5, 6, 7, 13	syl32anc 1379	. . . . 5 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = (-∞(,)+∞))
15		ioomax 13350	. . . . 5 ⊢ (-∞(,)+∞) = ℝ
16	14, 15	eqtrdi 2788	. . . 4 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ)
17		iocssre 13355	. . . . . 6 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ) → (-∞(,]𝐴) ⊆ ℝ)
18	1, 17	mpan 689	. . . . 5 ⊢ (𝐴 ∈ ℝ → (-∞(,]𝐴) ⊆ ℝ)
19	8, 9, 10	ixxdisj 13290	. . . . . 6 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅)
20	1, 3, 5, 19	mp3an2i 1467	. . . . 5 ⊢ (𝐴 ∈ ℝ → ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅)
21		uneqdifeq 4456	. . . . 5 ⊢ (((-∞(,]𝐴) ⊆ ℝ ∧ ((-∞(,]𝐴) ∩ (𝐴(,)+∞)) = ∅) → (((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ ↔ (ℝ ∖ (-∞(,]𝐴)) = (𝐴(,)+∞)))
22	18, 20, 21	syl2anc 585	. . . 4 ⊢ (𝐴 ∈ ℝ → (((-∞(,]𝐴) ∪ (𝐴(,)+∞)) = ℝ ↔ (ℝ ∖ (-∞(,]𝐴)) = (𝐴(,)+∞)))
23	16, 22	mpbid 231	. . 3 ⊢ (𝐴 ∈ ℝ → (ℝ ∖ (-∞(,]𝐴)) = (𝐴(,)+∞))
24		iooretop 24167	. . 3 ⊢ (𝐴(,)+∞) ∈ (topGen‘ran (,))
25	23, 24	eqeltrdi 2841	. 2 ⊢ (𝐴 ∈ ℝ → (ℝ ∖ (-∞(,]𝐴)) ∈ (topGen‘ran (,)))
26		retop 24163	. . 3 ⊢ (topGen‘ran (,)) ∈ Top
27		uniretop 24164	. . . 4 ⊢ ℝ = ∪ (topGen‘ran (,))
28	27	iscld2 22417	. . 3 ⊢ (((topGen‘ran (,)) ∈ Top ∧ (-∞(,]𝐴) ⊆ ℝ) → ((-∞(,]𝐴) ∈ (Clsd‘(topGen‘ran (,))) ↔ (ℝ ∖ (-∞(,]𝐴)) ∈ (topGen‘ran (,))))
29	26, 18, 28	sylancr 588	. 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 1542 ∈ wcel 2107 ∖ cdif 3911 ∪ cun 3912 ∩ cin 3913 ⊆ wss 3914 ∅c0 4288 class class class wbr 5111 ran crn 5640 ‘cfv 6502 (class class class)co 7363 ℝcr 11060 +∞cpnf 11196 -∞cmnf 11197 ℝ^*cxr 11198 < clt 11199 ≤ cle 11200 (,)cioo 13275 (,]cioc 13276 topGenctg 17334 Topctop 22280 Clsdccld 22405

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2703 ax-sep 5262 ax-nul 5269 ax-pow 5326 ax-pr 5390 ax-un 7678 ax-cnex 11117 ax-resscn 11118 ax-1cn 11119 ax-icn 11120 ax-addcl 11121 ax-addrcl 11122 ax-mulcl 11123 ax-mulrcl 11124 ax-mulcom 11125 ax-addass 11126 ax-mulass 11127 ax-distr 11128 ax-i2m1 11129 ax-1ne0 11130 ax-1rid 11131 ax-rnegex 11132 ax-rrecex 11133 ax-cnre 11134 ax-pre-lttri 11135 ax-pre-lttrn 11136 ax-pre-ltadd 11137 ax-pre-mulgt0 11138 ax-pre-sup 11139

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3352 df-reu 3353 df-rab 3407 df-v 3449 df-sbc 3744 df-csb 3860 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3933 df-nul 4289 df-if 4493 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4872 df-iun 4962 df-br 5112 df-opab 5174 df-mpt 5195 df-tr 5229 df-id 5537 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5594 df-we 5596 df-xp 5645 df-rel 5646 df-cnv 5647 df-co 5648 df-dm 5649 df-rn 5650 df-res 5651 df-ima 5652 df-pred 6259 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-riota 7319 df-ov 7366 df-oprab 7367 df-mpo 7368 df-om 7809 df-1st 7927 df-2nd 7928 df-frecs 8218 df-wrecs 8249 df-recs 8323 df-rdg 8362 df-er 8656 df-en 8892 df-dom 8893 df-sdom 8894 df-sup 9388 df-inf 9389 df-pnf 11201 df-mnf 11202 df-xr 11203 df-ltxr 11204 df-le 11205 df-sub 11397 df-neg 11398 df-div 11823 df-nn 12164 df-n0 12424 df-z 12510 df-uz 12774 df-q 12884 df-ioo 13279 df-ioc 13280 df-topgen 17340 df-top 22281 df-bases 22334 df-cld 22408

This theorem is referenced by: logdmopn 26042 orvclteel 33162 dvasin 36236 dvacos 36237 dvreasin 36238 dvreacos 36239 rfcnpre4 43343

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