iocmbl - Mathbox for Jon Pennant

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Theorem iocmbl 43225

Description: An open-below, closed-above real interval is measurable. (Contributed by Jon Pennant, 12-Jun-2019.)

**Assertion**
Ref	Expression
iocmbl	⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → (𝐴(,]𝐵) ∈ dom vol)

**Proof of Theorem iocmbl**
Step	Hyp	Ref	Expression
1		rexr 11307	. . . . 5 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ^*)
2		ioounsn 13517	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → ((𝐴(,)𝐵) ∪ {𝐵}) = (𝐴(,]𝐵))
3	1, 2	syl3an2 1165	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → ((𝐴(,)𝐵) ∪ {𝐵}) = (𝐴(,]𝐵))
4		ioombl 25600	. . . . . 6 ⊢ (𝐴(,)𝐵) ∈ dom vol
5		iccid 13432	. . . . . . . . 9 ⊢ (𝐵 ∈ ℝ^* → (𝐵[,]𝐵) = {𝐵})
6	1, 5	syl 17	. . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵[,]𝐵) = {𝐵})
7		iccmbl 25601	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐵[,]𝐵) ∈ dom vol)
8	7	anidms 566	. . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵[,]𝐵) ∈ dom vol)
9	6, 8	eqeltrrd 2842	. . . . . . 7 ⊢ (𝐵 ∈ ℝ → {𝐵} ∈ dom vol)
10	9	adantl 481	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → {𝐵} ∈ dom vol)
11		unmbl 25572	. . . . . 6 ⊢ (((𝐴(,)𝐵) ∈ dom vol ∧ {𝐵} ∈ dom vol) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
12	4, 10, 11	sylancr 587	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
13	12	3adant3 1133	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
14	3, 13	eqeltrrd 2842	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
15	14	3expa 1119	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
16		id 22	. . . . . 6 ⊢ (𝐴 ∈ ℝ^* → 𝐴 ∈ ℝ^*)
17		xrlenlt 11326	. . . . . 6 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐴 ∈ ℝ^*) → (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵))
18	1, 16, 17	syl2anr 597	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵))
19	18	biimp3ar 1472	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ ¬ 𝐴 < 𝐵) → 𝐵 ≤ 𝐴)
20		ioc0 13434	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴(,]𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
21	20	biimp3ar 1472	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) = ∅)
22	1, 21	syl3an2 1165	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) = ∅)
23		0mbl 25574	. . . . 5 ⊢ ∅ ∈ dom vol
24	22, 23	eqeltrdi 2849	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) ∈ dom vol)
25	19, 24	syld3an3 1411	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ ¬ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
26	25	3expa 1119	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ ¬ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
27	15, 26	pm2.61dan 813	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → (𝐴(,]𝐵) ∈ dom vol)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1540 ∈ wcel 2108 ∪ cun 3949 ∅c0 4333 {csn 4626 class class class wbr 5143 dom cdm 5685 (class class class)co 7431 ℝcr 11154 ℝ^*cxr 11294 < clt 11295 ≤ cle 11296 (,)cioo 13387 (,]cioc 13388 [,]cicc 13390 volcvol 25498

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 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-rep 5279 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-inf2 9681 ax-cnex 11211 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 ax-pre-mulgt0 11232 ax-pre-sup 11233

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3380 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-pss 3971 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-int 4947 df-iun 4993 df-br 5144 df-opab 5206 df-mpt 5226 df-tr 5260 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5637 df-se 5638 df-we 5639 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-pred 6321 df-ord 6387 df-on 6388 df-lim 6389 df-suc 6390 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-isom 6570 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-of 7697 df-om 7888 df-1st 8014 df-2nd 8015 df-frecs 8306 df-wrecs 8337 df-recs 8411 df-rdg 8450 df-1o 8506 df-2o 8507 df-er 8745 df-map 8868 df-pm 8869 df-en 8986 df-dom 8987 df-sdom 8988 df-fin 8989 df-sup 9482 df-inf 9483 df-oi 9550 df-dju 9941 df-card 9979 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 df-div 11921 df-nn 12267 df-2 12329 df-3 12330 df-n0 12527 df-z 12614 df-uz 12879 df-q 12991 df-rp 13035 df-xadd 13155 df-ioo 13391 df-ioc 13392 df-ico 13393 df-icc 13394 df-fz 13548 df-fzo 13695 df-fl 13832 df-seq 14043 df-exp 14103 df-hash 14370 df-cj 15138 df-re 15139 df-im 15140 df-sqrt 15274 df-abs 15275 df-clim 15524 df-rlim 15525 df-sum 15723 df-xmet 21357 df-met 21358 df-ovol 25499 df-vol 25500

This theorem is referenced by: (None)

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