iccvonmbllem - Mathbox for Glauco Siliprandi

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Theorem iccvonmbllem 44106

Description: Any n-dimensional closed interval is Lebesgue measurable. This is the second statement in Proposition 115G (c) of [Fremlin1] p. 32. (Contributed by Glauco Siliprandi, 8-Apr-2021.)

**Hypotheses**
Ref	Expression
iccvonmbllem.x	⊢ (𝜑 → 𝑋 ∈ Fin)
iccvonmbllem.s	⊢ 𝑆 = dom (voln‘𝑋)
iccvonmbllem.a	⊢ (𝜑 → 𝐴:𝑋⟶ℝ)
iccvonmbllem.b	⊢ (𝜑 → 𝐵:𝑋⟶ℝ)
iccvonmbllem.c	⊢ 𝐶 = (𝑛 ∈ ℕ ↦ (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))))
iccvonmbllem.d	⊢ 𝐷 = (𝑛 ∈ ℕ ↦ (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))))

**Assertion**
Ref	Expression
iccvonmbllem	⊢ (𝜑 → X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)) ∈ 𝑆)

Distinct variable groups: 𝐴,𝑛 𝐵,𝑛 𝐶,𝑖 𝐷,𝑖 𝑆,𝑛 𝑖,𝑋,𝑛 𝜑,𝑖,𝑛 Allowed substitution hints: 𝐴(𝑖) 𝐵(𝑖) 𝐶(𝑛) 𝐷(𝑛) 𝑆(𝑖)

**Proof of Theorem iccvonmbllem**
Step	Hyp	Ref	Expression
1		iccvonmbllem.c	. . . . . . . . . . . 12 ⊢ 𝐶 = (𝑛 ∈ ℕ ↦ (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))))
2	1	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐶 = (𝑛 ∈ ℕ ↦ (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛)))))
3		iccvonmbllem.x	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑋 ∈ Fin)
4	3	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝑋 ∈ Fin)
5	4	mptexd 7082	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))) ∈ V)
6	2, 5	fvmpt2d 6870	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐶‘𝑛) = (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))))
7		iccvonmbllem.a	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐴:𝑋⟶ℝ)
8	7	ffvelrnda 6943	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑋) → (𝐴‘𝑖) ∈ ℝ)
9	8	adantlr 711	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → (𝐴‘𝑖) ∈ ℝ)
10		nnrecre 11945	. . . . . . . . . . . 12 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ)
11	10	ad2antlr 723	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → (1 / 𝑛) ∈ ℝ)
12	9, 11	resubcld 11333	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → ((𝐴‘𝑖) − (1 / 𝑛)) ∈ ℝ)
13	6, 12	fvmpt2d 6870	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → ((𝐶‘𝑛)‘𝑖) = ((𝐴‘𝑖) − (1 / 𝑛)))
14	13	an32s 648	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑋) ∧ 𝑛 ∈ ℕ) → ((𝐶‘𝑛)‘𝑖) = ((𝐴‘𝑖) − (1 / 𝑛)))
15		iccvonmbllem.d	. . . . . . . . . . . 12 ⊢ 𝐷 = (𝑛 ∈ ℕ ↦ (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))))
16	15	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐷 = (𝑛 ∈ ℕ ↦ (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛)))))
17	4	mptexd 7082	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))) ∈ V)
18	16, 17	fvmpt2d 6870	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐷‘𝑛) = (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))))
19		iccvonmbllem.b	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵:𝑋⟶ℝ)
20	19	ffvelrnda 6943	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑋) → (𝐵‘𝑖) ∈ ℝ)
21	20	adantlr 711	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → (𝐵‘𝑖) ∈ ℝ)
22	21, 11	readdcld 10935	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → ((𝐵‘𝑖) + (1 / 𝑛)) ∈ ℝ)
23	18, 22	fvmpt2d 6870	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑛 ∈ ℕ) ∧ 𝑖 ∈ 𝑋) → ((𝐷‘𝑛)‘𝑖) = ((𝐵‘𝑖) + (1 / 𝑛)))
24	23	an32s 648	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑋) ∧ 𝑛 ∈ ℕ) → ((𝐷‘𝑛)‘𝑖) = ((𝐵‘𝑖) + (1 / 𝑛)))
25	14, 24	oveq12d 7273	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑖 ∈ 𝑋) ∧ 𝑛 ∈ ℕ) → (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) = (((𝐴‘𝑖) − (1 / 𝑛))(,)((𝐵‘𝑖) + (1 / 𝑛))))
26	25	iineq2dv 4946	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑋) → ∩ 𝑛 ∈ ℕ (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) = ∩ 𝑛 ∈ ℕ (((𝐴‘𝑖) − (1 / 𝑛))(,)((𝐵‘𝑖) + (1 / 𝑛))))
27	8, 20	iooiinicc 42970	. . . . . 6 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑋) → ∩ 𝑛 ∈ ℕ (((𝐴‘𝑖) − (1 / 𝑛))(,)((𝐵‘𝑖) + (1 / 𝑛))) = ((𝐴‘𝑖)[,](𝐵‘𝑖)))
28	26, 27	eqtrd 2778	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑋) → ∩ 𝑛 ∈ ℕ (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) = ((𝐴‘𝑖)[,](𝐵‘𝑖)))
29	28	ixpeq2dva 8658	. . . 4 ⊢ (𝜑 → X𝑖 ∈ 𝑋 ∩ 𝑛 ∈ ℕ (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) = X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)))
30	29	eqcomd 2744	. . 3 ⊢ (𝜑 → X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)) = X𝑖 ∈ 𝑋 ∩ 𝑛 ∈ ℕ (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)))
31		eqidd 2739	. . 3 ⊢ (𝜑 → X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)) = X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)))
32		nnn0 42807	. . . . 5 ⊢ ℕ ≠ ∅
33	32	a1i 11	. . . 4 ⊢ (𝜑 → ℕ ≠ ∅)
34		ixpiin 8670	. . . 4 ⊢ (ℕ ≠ ∅ → X𝑖 ∈ 𝑋 ∩ 𝑛 ∈ ℕ (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) = ∩ 𝑛 ∈ ℕ X𝑖 ∈ 𝑋 (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)))
35	33, 34	syl 17	. . 3 ⊢ (𝜑 → X𝑖 ∈ 𝑋 ∩ 𝑛 ∈ ℕ (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) = ∩ 𝑛 ∈ ℕ X𝑖 ∈ 𝑋 (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)))
36	30, 31, 35	3eqtr3d 2786	. 2 ⊢ (𝜑 → X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)) = ∩ 𝑛 ∈ ℕ X𝑖 ∈ 𝑋 (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)))
37		iccvonmbllem.s	. . . 4 ⊢ 𝑆 = dom (voln‘𝑋)
38	3, 37	dmovnsal 44040	. . 3 ⊢ (𝜑 → 𝑆 ∈ SAlg)
39		nnct 13629	. . . 4 ⊢ ℕ ≼ ω
40	39	a1i 11	. . 3 ⊢ (𝜑 → ℕ ≼ ω)
41	12	fmpttd 6971	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))):𝑋⟶ℝ)
42		ressxr 10950	. . . . . . 7 ⊢ ℝ ⊆ ℝ^*
43	42	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ℝ ⊆ ℝ^*)
44	41, 43	fssd 6602	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))):𝑋⟶ℝ^*)
45	6	feq1d 6569	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝐶‘𝑛):𝑋⟶ℝ^* ↔ (𝑖 ∈ 𝑋 ↦ ((𝐴‘𝑖) − (1 / 𝑛))):𝑋⟶ℝ^*))
46	44, 45	mpbird 256	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐶‘𝑛):𝑋⟶ℝ^*)
47	22	fmpttd 6971	. . . . . 6 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))):𝑋⟶ℝ)
48	47, 43	fssd 6602	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))):𝑋⟶ℝ^*)
49	18	feq1d 6569	. . . . 5 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → ((𝐷‘𝑛):𝑋⟶ℝ^* ↔ (𝑖 ∈ 𝑋 ↦ ((𝐵‘𝑖) + (1 / 𝑛))):𝑋⟶ℝ^*))
50	48, 49	mpbird 256	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐷‘𝑛):𝑋⟶ℝ^*)
51	4, 37, 46, 50	ioovonmbl 44105	. . 3 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → X𝑖 ∈ 𝑋 (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) ∈ 𝑆)
52	38, 40, 33, 51	saliincl 43756	. 2 ⊢ (𝜑 → ∩ 𝑛 ∈ ℕ X𝑖 ∈ 𝑋 (((𝐶‘𝑛)‘𝑖)(,)((𝐷‘𝑛)‘𝑖)) ∈ 𝑆)
53	36, 52	eqeltrd 2839	1 ⊢ (𝜑 → X𝑖 ∈ 𝑋 ((𝐴‘𝑖)[,](𝐵‘𝑖)) ∈ 𝑆)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 Vcvv 3422 ⊆ wss 3883 ∅c0 4253 ∩ ciin 4922 class class class wbr 5070 ↦ cmpt 5153 dom cdm 5580 ⟶wf 6414 ‘cfv 6418 (class class class)co 7255 ωcom 7687 Xcixp 8643 ≼ cdom 8689 Fincfn 8691 ℝcr 10801 1c1 10803 + caddc 10805 ℝ^*cxr 10939 − cmin 11135 / cdiv 11562 ℕcn 11903 (,)cioo 13008 [,]cicc 13011 volncvoln 43966

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-inf2 9329 ax-cc 10122 ax-ac2 10150 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 ax-addf 10881 ax-mulf 10882

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-iin 4924 df-disj 5036 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-of 7511 df-om 7688 df-1st 7804 df-2nd 7805 df-supp 7949 df-tpos 8013 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-2o 8268 df-oadd 8271 df-omul 8272 df-er 8456 df-map 8575 df-pm 8576 df-ixp 8644 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-fsupp 9059 df-fi 9100 df-sup 9131 df-inf 9132 df-oi 9199 df-dju 9590 df-card 9628 df-acn 9631 df-ac 9803 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-4 11968 df-5 11969 df-6 11970 df-7 11971 df-8 11972 df-9 11973 df-n0 12164 df-z 12250 df-dec 12367 df-uz 12512 df-q 12618 df-rp 12660 df-xneg 12777 df-xadd 12778 df-xmul 12779 df-ioo 13012 df-ico 13014 df-icc 13015 df-fz 13169 df-fzo 13312 df-fl 13440 df-seq 13650 df-exp 13711 df-hash 13973 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-clim 15125 df-rlim 15126 df-sum 15326 df-prod 15544 df-struct 16776 df-sets 16793 df-slot 16811 df-ndx 16823 df-base 16841 df-ress 16868 df-plusg 16901 df-mulr 16902 df-starv 16903 df-sca 16904 df-vsca 16905 df-ip 16906 df-tset 16907 df-ple 16908 df-ds 16910 df-unif 16911 df-hom 16912 df-cco 16913 df-rest 17050 df-topn 17051 df-0g 17069 df-gsum 17070 df-topgen 17071 df-prds 17075 df-pws 17077 df-mgm 18241 df-sgrp 18290 df-mnd 18301 df-mhm 18345 df-submnd 18346 df-grp 18495 df-minusg 18496 df-sbg 18497 df-subg 18667 df-ghm 18747 df-cntz 18838 df-cmn 19303 df-abl 19304 df-mgp 19636 df-ur 19653 df-ring 19700 df-cring 19701 df-oppr 19777 df-dvdsr 19798 df-unit 19799 df-invr 19829 df-dvr 19840 df-rnghom 19874 df-drng 19908 df-field 19909 df-subrg 19937 df-abv 19992 df-staf 20020 df-srng 20021 df-lmod 20040 df-lss 20109 df-lmhm 20199 df-lvec 20280 df-sra 20349 df-rgmod 20350 df-psmet 20502 df-xmet 20503 df-met 20504 df-bl 20505 df-mopn 20506 df-cnfld 20511 df-refld 20722 df-phl 20743 df-dsmm 20849 df-frlm 20864 df-top 21951 df-topon 21968 df-topsp 21990 df-bases 22004 df-cmp 22446 df-xms 23381 df-ms 23382 df-nm 23644 df-ngp 23645 df-tng 23646 df-nrg 23647 df-nlm 23648 df-clm 24132 df-cph 24237 df-tcph 24238 df-rrx 24454 df-ovol 24533 df-vol 24534 df-salg 43740 df-sumge0 43791 df-mea 43878 df-ome 43918 df-caragen 43920 df-ovoln 43965 df-voln 43967

This theorem is referenced by: iccvonmbl 44107

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