iocmbl - Mathbox for Jon Pennant

	Mathbox for Jon Pennant		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > Mathboxes > iocmbl		Structured version Visualization version GIF version

Theorem iocmbl 42878

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 11310	. . . . 5 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ^*)
2		ioounsn 13508	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐴 < 𝐵) → ((𝐴(,)𝐵) ∪ {𝐵}) = (𝐴(,]𝐵))
3	1, 2	syl3an2 1161	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → ((𝐴(,)𝐵) ∪ {𝐵}) = (𝐴(,]𝐵))
4		ioombl 25585	. . . . . 6 ⊢ (𝐴(,)𝐵) ∈ dom vol
5		iccid 13423	. . . . . . . . 9 ⊢ (𝐵 ∈ ℝ^* → (𝐵[,]𝐵) = {𝐵})
6	1, 5	syl 17	. . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵[,]𝐵) = {𝐵})
7		iccmbl 25586	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐵[,]𝐵) ∈ dom vol)
8	7	anidms 565	. . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵[,]𝐵) ∈ dom vol)
9	6, 8	eqeltrrd 2827	. . . . . . 7 ⊢ (𝐵 ∈ ℝ → {𝐵} ∈ dom vol)
10	9	adantl 480	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → {𝐵} ∈ dom vol)
11		unmbl 25557	. . . . . 6 ⊢ (((𝐴(,)𝐵) ∈ dom vol ∧ {𝐵} ∈ dom vol) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
12	4, 10, 11	sylancr 585	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
13	12	3adant3 1129	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
14	3, 13	eqeltrrd 2827	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
15	14	3expa 1115	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
16		id 22	. . . . . 6 ⊢ (𝐴 ∈ ℝ^* → 𝐴 ∈ ℝ^*)
17		xrlenlt 11329	. . . . . 6 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐴 ∈ ℝ^*) → (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵))
18	1, 16, 17	syl2anr 595	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵))
19	18	biimp3ar 1467	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ ¬ 𝐴 < 𝐵) → 𝐵 ≤ 𝐴)
20		ioc0 13425	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴(,]𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
21	20	biimp3ar 1467	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) = ∅)
22	1, 21	syl3an2 1161	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) = ∅)
23		0mbl 25559	. . . . 5 ⊢ ∅ ∈ dom vol
24	22, 23	eqeltrdi 2834	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) ∈ dom vol)
25	19, 24	syld3an3 1406	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ ¬ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
26	25	3expa 1115	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ ¬ 𝐴 < 𝐵) → (𝐴(,]𝐵) ∈ dom vol)
27	15, 26	pm2.61dan 811	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → (𝐴(,]𝐵) ∈ dom vol)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1084 = wceq 1534 ∈ wcel 2099 ∪ cun 3945 ∅c0 4325 {csn 4633 class class class wbr 5153 dom cdm 5682 (class class class)co 7424 ℝcr 11157 ℝ^*cxr 11297 < clt 11298 ≤ cle 11299 (,)cioo 13378 (,]cioc 13379 [,]cicc 13381 volcvol 25483

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 2697 ax-rep 5290 ax-sep 5304 ax-nul 5311 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-inf2 9684 ax-cnex 11214 ax-resscn 11215 ax-1cn 11216 ax-icn 11217 ax-addcl 11218 ax-addrcl 11219 ax-mulcl 11220 ax-mulrcl 11221 ax-mulcom 11222 ax-addass 11223 ax-mulass 11224 ax-distr 11225 ax-i2m1 11226 ax-1ne0 11227 ax-1rid 11228 ax-rnegex 11229 ax-rrecex 11230 ax-cnre 11231 ax-pre-lttri 11232 ax-pre-lttrn 11233 ax-pre-ltadd 11234 ax-pre-mulgt0 11235 ax-pre-sup 11236

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2704 df-cleq 2718 df-clel 2803 df-nfc 2878 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3464 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3967 df-nul 4326 df-if 4534 df-pw 4609 df-sn 4634 df-pr 4636 df-op 4640 df-uni 4914 df-int 4955 df-iun 5003 df-br 5154 df-opab 5216 df-mpt 5237 df-tr 5271 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-se 5638 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6312 df-ord 6379 df-on 6380 df-lim 6381 df-suc 6382 df-iota 6506 df-fun 6556 df-fn 6557 df-f 6558 df-f1 6559 df-fo 6560 df-f1o 6561 df-fv 6562 df-isom 6563 df-riota 7380 df-ov 7427 df-oprab 7428 df-mpo 7429 df-of 7690 df-om 7877 df-1st 8003 df-2nd 8004 df-frecs 8296 df-wrecs 8327 df-recs 8401 df-rdg 8440 df-1o 8496 df-2o 8497 df-er 8734 df-map 8857 df-pm 8858 df-en 8975 df-dom 8976 df-sdom 8977 df-fin 8978 df-sup 9485 df-inf 9486 df-oi 9553 df-dju 9944 df-card 9982 df-pnf 11300 df-mnf 11301 df-xr 11302 df-ltxr 11303 df-le 11304 df-sub 11496 df-neg 11497 df-div 11922 df-nn 12265 df-2 12327 df-3 12328 df-n0 12525 df-z 12611 df-uz 12875 df-q 12985 df-rp 13029 df-xadd 13147 df-ioo 13382 df-ioc 13383 df-ico 13384 df-icc 13385 df-fz 13539 df-fzo 13682 df-fl 13812 df-seq 14022 df-exp 14082 df-hash 14348 df-cj 15104 df-re 15105 df-im 15106 df-sqrt 15240 df-abs 15241 df-clim 15490 df-rlim 15491 df-sum 15691 df-xmet 21336 df-met 21337 df-ovol 25484 df-vol 25485

This theorem is referenced by: (None)

W3C validator