ioodvbdlimc2 - Mathbox for Glauco Siliprandi

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Theorem ioodvbdlimc2 46200

Description: A real function with bounded derivative, has a limit at the upper bound of an open interval. (Contributed by Glauco Siliprandi, 11-Dec-2019.) (Proof shortened by AV, 3-Oct-2020.)

**Hypotheses**
Ref	Expression
ioodvbdlimc2.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
ioodvbdlimc2.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
ioodvbdlimc2.f	⊢ (𝜑 → 𝐹:(𝐴(,)𝐵)⟶ℝ)
ioodvbdlimc2.dmdv	⊢ (𝜑 → dom (ℝ D 𝐹) = (𝐴(,)𝐵))
ioodvbdlimc2.dvbd	⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ (𝐴(,)𝐵)(abs‘((ℝ D 𝐹)‘𝑥)) ≤ 𝑦)

**Assertion**
Ref	Expression
ioodvbdlimc2	⊢ (𝜑 → (𝐹 lim_ℂ 𝐵) ≠ ∅)

Distinct variable groups: 𝑥,𝐴,𝑦 𝑥,𝐵,𝑦 𝑥,𝐹,𝑦 𝜑,𝑥,𝑦

Proof of Theorem ioodvbdlimc2 Dummy variables 𝑗 𝑘 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ioodvbdlimc2.a	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ)
2	1	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ)
3		ioodvbdlimc2.b	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ)
4	3	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ)
5		simpr 484	. . . 4 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐵)
6		ioodvbdlimc2.f	. . . . 5 ⊢ (𝜑 → 𝐹:(𝐴(,)𝐵)⟶ℝ)
7	6	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐹:(𝐴(,)𝐵)⟶ℝ)
8		ioodvbdlimc2.dmdv	. . . . 5 ⊢ (𝜑 → dom (ℝ D 𝐹) = (𝐴(,)𝐵))
9	8	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → dom (ℝ D 𝐹) = (𝐴(,)𝐵))
10		ioodvbdlimc2.dvbd	. . . . 5 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ (𝐴(,)𝐵)(abs‘((ℝ D 𝐹)‘𝑥)) ≤ 𝑦)
11	10	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → ∃𝑦 ∈ ℝ ∀𝑥 ∈ (𝐴(,)𝐵)(abs‘((ℝ D 𝐹)‘𝑥)) ≤ 𝑦)
12		2fveq3 6839	. . . . . . 7 ⊢ (𝑦 = 𝑥 → (abs‘((ℝ D 𝐹)‘𝑦)) = (abs‘((ℝ D 𝐹)‘𝑥)))
13	12	cbvmptv 5202	. . . . . 6 ⊢ (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))) = (𝑥 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑥)))
14	13	rneqi 5886	. . . . 5 ⊢ ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))) = ran (𝑥 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑥)))
15	14	supeq1i 9352	. . . 4 ⊢ sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) = sup(ran (𝑥 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑥))), ℝ, < )
16		eqid 2736	. . . 4 ⊢ ((⌊‘(1 / (𝐵 − 𝐴))) + 1) = ((⌊‘(1 / (𝐵 − 𝐴))) + 1)
17		oveq2 7366	. . . . . . 7 ⊢ (𝑘 = 𝑗 → (1 / 𝑘) = (1 / 𝑗))
18	17	oveq2d 7374	. . . . . 6 ⊢ (𝑘 = 𝑗 → (𝐵 − (1 / 𝑘)) = (𝐵 − (1 / 𝑗)))
19	18	fveq2d 6838	. . . . 5 ⊢ (𝑘 = 𝑗 → (𝐹‘(𝐵 − (1 / 𝑘))) = (𝐹‘(𝐵 − (1 / 𝑗))))
20	19	cbvmptv 5202	. . . 4 ⊢ (𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘)))) = (𝑗 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑗))))
21	18	cbvmptv 5202	. . . 4 ⊢ (𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐵 − (1 / 𝑘))) = (𝑗 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐵 − (1 / 𝑗)))
22		eqid 2736	. . . 4 ⊢ if(((⌊‘(1 / (𝐵 − 𝐴))) + 1) ≤ ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(1 / (𝐵 − 𝐴))) + 1)) = if(((⌊‘(1 / (𝐵 − 𝐴))) + 1) ≤ ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(1 / (𝐵 − 𝐴))) + 1))
23		biid 261	. . . 4 ⊢ (((((((𝜑 ∧ 𝐴 < 𝐵) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ (ℤ_≥‘if(((⌊‘(1 / (𝐵 − 𝐴))) + 1) ≤ ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(1 / (𝐵 − 𝐴))) + 1)))) ∧ (abs‘(((𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘))))‘𝑗) − (lim sup‘(𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘))))))) < (𝑥 / 2)) ∧ 𝑧 ∈ (𝐴(,)𝐵)) ∧ (abs‘(𝑧 − 𝐵)) < (1 / 𝑗)) ↔ ((((((𝜑 ∧ 𝐴 < 𝐵) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ (ℤ_≥‘if(((⌊‘(1 / (𝐵 − 𝐴))) + 1) ≤ ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(sup(ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))), ℝ, < ) / (𝑥 / 2))) + 1), ((⌊‘(1 / (𝐵 − 𝐴))) + 1)))) ∧ (abs‘(((𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘))))‘𝑗) − (lim sup‘(𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘))))))) < (𝑥 / 2)) ∧ 𝑧 ∈ (𝐴(,)𝐵)) ∧ (abs‘(𝑧 − 𝐵)) < (1 / 𝑗)))
24	2, 4, 5, 7, 9, 11, 15, 16, 20, 21, 22, 23	ioodvbdlimc2lem 46199	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (lim sup‘(𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘))))) ∈ (𝐹 lim_ℂ 𝐵))
25	24	ne0d 4294	. 2 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (𝐹 lim_ℂ 𝐵) ≠ ∅)
26		ax-resscn 11085	. . . . . . . 8 ⊢ ℝ ⊆ ℂ
27	26	a1i 11	. . . . . . 7 ⊢ (𝜑 → ℝ ⊆ ℂ)
28	6, 27	fssd 6679	. . . . . 6 ⊢ (𝜑 → 𝐹:(𝐴(,)𝐵)⟶ℂ)
29	28	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐹:(𝐴(,)𝐵)⟶ℂ)
30		simpr 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐵 ≤ 𝐴)
31	1	rexrd 11184	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
32	31	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐴 ∈ ℝ^*)
33	3	rexrd 11184	. . . . . . . . 9 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
34	33	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐵 ∈ ℝ^*)
35		ioo0 13288	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
36	32, 34, 35	syl2anc 584	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
37	30, 36	mpbird 257	. . . . . 6 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐴(,)𝐵) = ∅)
38	37	feq2d 6646	. . . . 5 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐹:(𝐴(,)𝐵)⟶ℂ ↔ 𝐹:∅⟶ℂ))
39	29, 38	mpbid 232	. . . 4 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐹:∅⟶ℂ)
40	3	recnd 11162	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ)
41	40	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐵 ∈ ℂ)
42	39, 41	limcdm0 45885	. . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐹 lim_ℂ 𝐵) = ℂ)
43		0cn 11126	. . . . 5 ⊢ 0 ∈ ℂ
44	43	ne0ii 4296	. . . 4 ⊢ ℂ ≠ ∅
45	44	a1i 11	. . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → ℂ ≠ ∅)
46	42, 45	eqnetrd 2999	. 2 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐹 lim_ℂ 𝐵) ≠ ∅)
47	25, 46, 1, 3	ltlecasei 11243	1 ⊢ (𝜑 → (𝐹 lim_ℂ 𝐵) ≠ ∅)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ≠ wne 2932 ∀wral 3051 ∃wrex 3060 ⊆ wss 3901 ∅c0 4285 ifcif 4479 class class class wbr 5098 ↦ cmpt 5179 dom cdm 5624 ran crn 5625 ⟶wf 6488 ‘cfv 6492 (class class class)co 7358 supcsup 9345 ℂcc 11026 ℝcr 11027 0cc0 11028 1c1 11029 + caddc 11031 ℝ^*cxr 11167 < clt 11168 ≤ cle 11169 − cmin 11366 / cdiv 11796 2c2 12202 ℤ_≥cuz 12753 ℝ⁺crp 12907 (,)cioo 13263 ⌊cfl 13712 abscabs 15159 lim supclsp 15395 lim_ℂ climc 25821 D cdv 25822

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106 ax-addf 11107

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 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 3061 df-rmo 3350 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-tp 4585 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-iin 4949 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-se 5578 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-isom 6501 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-of 7622 df-om 7809 df-1st 7933 df-2nd 7934 df-supp 8103 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-1o 8397 df-2o 8398 df-er 8635 df-map 8767 df-pm 8768 df-ixp 8838 df-en 8886 df-dom 8887 df-sdom 8888 df-fin 8889 df-fsupp 9267 df-fi 9316 df-sup 9347 df-inf 9348 df-oi 9417 df-card 9853 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-div 11797 df-nn 12148 df-2 12210 df-3 12211 df-4 12212 df-5 12213 df-6 12214 df-7 12215 df-8 12216 df-9 12217 df-n0 12404 df-z 12491 df-dec 12610 df-uz 12754 df-q 12864 df-rp 12908 df-xneg 13028 df-xadd 13029 df-xmul 13030 df-ioo 13267 df-ico 13269 df-icc 13270 df-fz 13426 df-fzo 13573 df-fl 13714 df-seq 13927 df-exp 13987 df-hash 14256 df-cj 15024 df-re 15025 df-im 15026 df-sqrt 15160 df-abs 15161 df-limsup 15396 df-clim 15413 df-rlim 15414 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17139 df-ress 17160 df-plusg 17192 df-mulr 17193 df-starv 17194 df-sca 17195 df-vsca 17196 df-ip 17197 df-tset 17198 df-ple 17199 df-ds 17201 df-unif 17202 df-hom 17203 df-cco 17204 df-rest 17344 df-topn 17345 df-0g 17363 df-gsum 17364 df-topgen 17365 df-pt 17366 df-prds 17369 df-xrs 17425 df-qtop 17430 df-imas 17431 df-xps 17433 df-mre 17507 df-mrc 17508 df-acs 17510 df-mgm 18567 df-sgrp 18646 df-mnd 18662 df-submnd 18711 df-mulg 19000 df-cntz 19248 df-cmn 19713 df-psmet 21303 df-xmet 21304 df-met 21305 df-bl 21306 df-mopn 21307 df-fbas 21308 df-fg 21309 df-cnfld 21312 df-top 22840 df-topon 22857 df-topsp 22879 df-bases 22892 df-cld 22965 df-ntr 22966 df-cls 22967 df-nei 23044 df-lp 23082 df-perf 23083 df-cn 23173 df-cnp 23174 df-haus 23261 df-cmp 23333 df-tx 23508 df-hmeo 23701 df-fil 23792 df-fm 23884 df-flim 23885 df-flf 23886 df-xms 24266 df-ms 24267 df-tms 24268 df-cncf 24829 df-limc 25825 df-dv 25826

This theorem is referenced by: fourierdlem94 46465 fourierdlem113 46484

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