voliooico - Mathbox for Glauco Siliprandi

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Theorem voliooico 42634

Description: An open interval and a left-closed, right-open interval with the same real bounds, have the same Lebesgue measure. (Contributed by Glauco Siliprandi, 3-Mar-2021.)

**Hypotheses**
Ref	Expression
voliooico.1	⊢ (𝜑 → 𝐴 ∈ ℝ)
voliooico.2	⊢ (𝜑 → 𝐵 ∈ ℝ)

**Assertion**
Ref	Expression
voliooico	⊢ (𝜑 → (vol‘(𝐴(,)𝐵)) = (vol‘(𝐴[,)𝐵)))

**Proof of Theorem voliooico**
Step	Hyp	Ref	Expression
1		iftrue 4431	. . . . . 6 ⊢ (𝐴 < 𝐵 → if(𝐴 < 𝐵, (𝐵 − 𝐴), 0) = (𝐵 − 𝐴))
2	1	adantl 485	. . . . 5 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝐴 < 𝐵) → if(𝐴 < 𝐵, (𝐵 − 𝐴), 0) = (𝐵 − 𝐴))
3		voliooico.2	. . . . . . . . . 10 ⊢ (𝜑 → 𝐵 ∈ ℝ)
4	3	recnd 10658	. . . . . . . . 9 ⊢ (𝜑 → 𝐵 ∈ ℂ)
5	4	subidd 10974	. . . . . . . 8 ⊢ (𝜑 → (𝐵 − 𝐵) = 0)
6	5	eqcomd 2804	. . . . . . 7 ⊢ (𝜑 → 0 = (𝐵 − 𝐵))
7	6	ad2antrr 725	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → 0 = (𝐵 − 𝐵))
8		iffalse 4434	. . . . . . 7 ⊢ (¬ 𝐴 < 𝐵 → if(𝐴 < 𝐵, (𝐵 − 𝐴), 0) = 0)
9	8	adantl 485	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → if(𝐴 < 𝐵, (𝐵 − 𝐴), 0) = 0)
10		simpll 766	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → 𝜑)
11		voliooico.1	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ ℝ)
12	10, 11	syl 17	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → 𝐴 ∈ ℝ)
13	10, 3	syl 17	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → 𝐵 ∈ ℝ)
14		simpr 488	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → 𝐴 ≤ 𝐵)
15	14	adantr 484	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → 𝐴 ≤ 𝐵)
16		simpr 488	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → ¬ 𝐴 < 𝐵)
17	12, 13, 15, 16	lenlteq 41996	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → 𝐴 = 𝐵)
18		oveq2 7143	. . . . . . . 8 ⊢ (𝐴 = 𝐵 → (𝐵 − 𝐴) = (𝐵 − 𝐵))
19	18	adantl 485	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 = 𝐵) → (𝐵 − 𝐴) = (𝐵 − 𝐵))
20	10, 17, 19	syl2anc 587	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → (𝐵 − 𝐴) = (𝐵 − 𝐵))
21	7, 9, 20	3eqtr4d 2843	. . . . 5 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ ¬ 𝐴 < 𝐵) → if(𝐴 < 𝐵, (𝐵 − 𝐴), 0) = (𝐵 − 𝐴))
22	2, 21	pm2.61dan 812	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → if(𝐴 < 𝐵, (𝐵 − 𝐴), 0) = (𝐵 − 𝐴))
23	22	eqcomd 2804	. . 3 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (𝐵 − 𝐴) = if(𝐴 < 𝐵, (𝐵 − 𝐴), 0))
24	11	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → 𝐴 ∈ ℝ)
25	3	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → 𝐵 ∈ ℝ)
26		volioo 24173	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 ≤ 𝐵) → (vol‘(𝐴(,)𝐵)) = (𝐵 − 𝐴))
27	24, 25, 14, 26	syl3anc 1368	. . 3 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (vol‘(𝐴(,)𝐵)) = (𝐵 − 𝐴))
28		volico 42625	. . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (vol‘(𝐴[,)𝐵)) = if(𝐴 < 𝐵, (𝐵 − 𝐴), 0))
29	11, 3, 28	syl2anc 587	. . . 4 ⊢ (𝜑 → (vol‘(𝐴[,)𝐵)) = if(𝐴 < 𝐵, (𝐵 − 𝐴), 0))
30	29	adantr 484	. . 3 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (vol‘(𝐴[,)𝐵)) = if(𝐴 < 𝐵, (𝐵 − 𝐴), 0))
31	23, 27, 30	3eqtr4d 2843	. 2 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (vol‘(𝐴(,)𝐵)) = (vol‘(𝐴[,)𝐵)))
32		simpl 486	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → 𝜑)
33		simpr 488	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → ¬ 𝐴 ≤ 𝐵)
34	32, 3	syl 17	. . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → 𝐵 ∈ ℝ)
35	32, 11	syl 17	. . . . 5 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → 𝐴 ∈ ℝ)
36	34, 35	ltnled 10776	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → (𝐵 < 𝐴 ↔ ¬ 𝐴 ≤ 𝐵))
37	33, 36	mpbird 260	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → 𝐵 < 𝐴)
38	3	adantr 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → 𝐵 ∈ ℝ)
39	11	adantr 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → 𝐴 ∈ ℝ)
40		simpr 488	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → 𝐵 < 𝐴)
41	38, 39, 40	ltled 10777	. . . . . 6 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → 𝐵 ≤ 𝐴)
42	39	rexrd 10680	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → 𝐴 ∈ ℝ^*)
43	38	rexrd 10680	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → 𝐵 ∈ ℝ^*)
44		ioo0 12751	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
45	42, 43, 44	syl2anc 587	. . . . . 6 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
46	41, 45	mpbird 260	. . . . 5 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → (𝐴(,)𝐵) = ∅)
47		ico0 12772	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴[,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
48	42, 43, 47	syl2anc 587	. . . . . 6 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → ((𝐴[,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
49	41, 48	mpbird 260	. . . . 5 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → (𝐴[,)𝐵) = ∅)
50	46, 49	eqtr4d 2836	. . . 4 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → (𝐴(,)𝐵) = (𝐴[,)𝐵))
51	50	fveq2d 6649	. . 3 ⊢ ((𝜑 ∧ 𝐵 < 𝐴) → (vol‘(𝐴(,)𝐵)) = (vol‘(𝐴[,)𝐵)))
52	32, 37, 51	syl2anc 587	. 2 ⊢ ((𝜑 ∧ ¬ 𝐴 ≤ 𝐵) → (vol‘(𝐴(,)𝐵)) = (vol‘(𝐴[,)𝐵)))
53	31, 52	pm2.61dan 812	1 ⊢ (𝜑 → (vol‘(𝐴(,)𝐵)) = (vol‘(𝐴[,)𝐵)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ∅c0 4243 ifcif 4425 class class class wbr 5030 ‘cfv 6324 (class class class)co 7135 ℝcr 10525 0cc0 10526 ℝ^*cxr 10663 < clt 10664 ≤ cle 10665 − cmin 10859 (,)cioo 12726 [,)cico 12728 volcvol 24067

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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-inf2 9088 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 ax-pre-sup 10604

This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-int 4839 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-se 5479 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-isom 6333 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-of 7389 df-om 7561 df-1st 7671 df-2nd 7672 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-1o 8085 df-2o 8086 df-oadd 8089 df-er 8272 df-map 8391 df-pm 8392 df-en 8493 df-dom 8494 df-sdom 8495 df-fin 8496 df-fi 8859 df-sup 8890 df-inf 8891 df-oi 8958 df-dju 9314 df-card 9352 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-div 11287 df-nn 11626 df-2 11688 df-3 11689 df-n0 11886 df-z 11970 df-uz 12232 df-q 12337 df-rp 12378 df-xneg 12495 df-xadd 12496 df-xmul 12497 df-ioo 12730 df-ico 12732 df-icc 12733 df-fz 12886 df-fzo 13029 df-fl 13157 df-seq 13365 df-exp 13426 df-hash 13687 df-cj 14450 df-re 14451 df-im 14452 df-sqrt 14586 df-abs 14587 df-clim 14837 df-rlim 14838 df-sum 15035 df-rest 16688 df-topgen 16709 df-psmet 20083 df-xmet 20084 df-met 20085 df-bl 20086 df-mopn 20087 df-top 21499 df-topon 21516 df-bases 21551 df-cmp 21992 df-ovol 24068 df-vol 24069

This theorem is referenced by: voliooicof 42638 vonn0ioo2 43329

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