iocmbl - Mathbox for Jon Pennant

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Theorem iocmbl 43641

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 11191	. . . . 5 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ^*)
2		ioounsn 13430	. . . . 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 25532	. . . . . 6 ⊢ (𝐴(,)𝐵) ∈ dom vol
5		iccid 13343	. . . . . . . . 9 ⊢ (𝐵 ∈ ℝ^* → (𝐵[,]𝐵) = {𝐵})
6	1, 5	syl 17	. . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵[,]𝐵) = {𝐵})
7		iccmbl 25533	. . . . . . . . 9 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐵[,]𝐵) ∈ dom vol)
8	7	anidms 566	. . . . . . . 8 ⊢ (𝐵 ∈ ℝ → (𝐵[,]𝐵) ∈ dom vol)
9	6, 8	eqeltrrd 2837	. . . . . . 7 ⊢ (𝐵 ∈ ℝ → {𝐵} ∈ dom vol)
10	9	adantl 481	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → {𝐵} ∈ dom vol)
11		unmbl 25504	. . . . . 6 ⊢ (((𝐴(,)𝐵) ∈ dom vol ∧ {𝐵} ∈ dom vol) → ((𝐴(,)𝐵) ∪ {𝐵}) ∈ dom vol)
12	4, 10, 11	sylancr 588	. . . . 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 2837	. . 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 11210	. . . . . 6 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐴 ∈ ℝ^*) → (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵))
18	1, 16, 17	syl2anr 598	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵))
19	18	biimp3ar 1473	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ ¬ 𝐴 < 𝐵) → 𝐵 ≤ 𝐴)
20		ioc0 13345	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴(,]𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
21	20	biimp3ar 1473	. . . . . 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 25506	. . . . 5 ⊢ ∅ ∈ dom vol
24	22, 23	eqeltrdi 2844	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ ∧ 𝐵 ≤ 𝐴) → (𝐴(,]𝐵) ∈ dom vol)
25	19, 24	syld3an3 1412	. . 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 1542 ∈ wcel 2114 ∪ cun 3887 ∅c0 4273 {csn 4567 class class class wbr 5085 dom cdm 5631 (class class class)co 7367 ℝcr 11037 ℝ^*cxr 11178 < clt 11179 ≤ cle 11180 (,)cioo 13298 (,]cioc 13299 [,]cicc 13301 volcvol 25430

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-inf2 9562 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-pre-sup 11116

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-isom 6507 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-of 7631 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-2o 8406 df-er 8643 df-map 8775 df-pm 8776 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-sup 9355 df-inf 9356 df-oi 9425 df-dju 9825 df-card 9863 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-div 11808 df-nn 12175 df-2 12244 df-3 12245 df-n0 12438 df-z 12525 df-uz 12789 df-q 12899 df-rp 12943 df-xadd 13064 df-ioo 13302 df-ioc 13303 df-ico 13304 df-icc 13305 df-fz 13462 df-fzo 13609 df-fl 13751 df-seq 13964 df-exp 14024 df-hash 14293 df-cj 15061 df-re 15062 df-im 15063 df-sqrt 15197 df-abs 15198 df-clim 15450 df-rlim 15451 df-sum 15649 df-xmet 21345 df-met 21346 df-ovol 25431 df-vol 25432

This theorem is referenced by: (None)

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