ioodvbdlimc2 - Mathbox for Glauco Siliprandi

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Theorem ioodvbdlimc2 45856

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 6925	. . . . . . 7 ⊢ (𝑦 = 𝑥 → (abs‘((ℝ D 𝐹)‘𝑦)) = (abs‘((ℝ D 𝐹)‘𝑥)))
13	12	cbvmptv 5279	. . . . . 6 ⊢ (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))) = (𝑥 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑥)))
14	13	rneqi 5962	. . . . 5 ⊢ ran (𝑦 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑦))) = ran (𝑥 ∈ (𝐴(,)𝐵) ↦ (abs‘((ℝ D 𝐹)‘𝑥)))
15	14	supeq1i 9516	. . . 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 2740	. . . 4 ⊢ ((⌊‘(1 / (𝐵 − 𝐴))) + 1) = ((⌊‘(1 / (𝐵 − 𝐴))) + 1)
17		oveq2 7456	. . . . . . 7 ⊢ (𝑘 = 𝑗 → (1 / 𝑘) = (1 / 𝑗))
18	17	oveq2d 7464	. . . . . 6 ⊢ (𝑘 = 𝑗 → (𝐵 − (1 / 𝑘)) = (𝐵 − (1 / 𝑗)))
19	18	fveq2d 6924	. . . . 5 ⊢ (𝑘 = 𝑗 → (𝐹‘(𝐵 − (1 / 𝑘))) = (𝐹‘(𝐵 − (1 / 𝑗))))
20	19	cbvmptv 5279	. . . 4 ⊢ (𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘)))) = (𝑗 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑗))))
21	18	cbvmptv 5279	. . . 4 ⊢ (𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐵 − (1 / 𝑘))) = (𝑗 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐵 − (1 / 𝑗)))
22		eqid 2740	. . . 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 45855	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (lim sup‘(𝑘 ∈ (ℤ_≥‘((⌊‘(1 / (𝐵 − 𝐴))) + 1)) ↦ (𝐹‘(𝐵 − (1 / 𝑘))))) ∈ (𝐹 lim_ℂ 𝐵))
25	24	ne0d 4365	. 2 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → (𝐹 lim_ℂ 𝐵) ≠ ∅)
26		ax-resscn 11241	. . . . . . . 8 ⊢ ℝ ⊆ ℂ
27	26	a1i 11	. . . . . . 7 ⊢ (𝜑 → ℝ ⊆ ℂ)
28	6, 27	fssd 6764	. . . . . 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 11340	. . . . . . . . 9 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
32	31	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐴 ∈ ℝ^*)
33	3	rexrd 11340	. . . . . . . . 9 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
34	33	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐵 ∈ ℝ^*)
35		ioo0 13432	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
36	32, 34, 35	syl2anc 583	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → ((𝐴(,)𝐵) = ∅ ↔ 𝐵 ≤ 𝐴))
37	30, 36	mpbird 257	. . . . . 6 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐴(,)𝐵) = ∅)
38	37	feq2d 6733	. . . . 5 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐹:(𝐴(,)𝐵)⟶ℂ ↔ 𝐹:∅⟶ℂ))
39	29, 38	mpbid 232	. . . 4 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐹:∅⟶ℂ)
40	3	recnd 11318	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ)
41	40	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → 𝐵 ∈ ℂ)
42	39, 41	limcdm0 45539	. . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐹 lim_ℂ 𝐵) = ℂ)
43		0cn 11282	. . . . 5 ⊢ 0 ∈ ℂ
44	43	ne0ii 4367	. . . 4 ⊢ ℂ ≠ ∅
45	44	a1i 11	. . 3 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → ℂ ≠ ∅)
46	42, 45	eqnetrd 3014	. 2 ⊢ ((𝜑 ∧ 𝐵 ≤ 𝐴) → (𝐹 lim_ℂ 𝐵) ≠ ∅)
47	25, 46, 1, 3	ltlecasei 11398	1 ⊢ (𝜑 → (𝐹 lim_ℂ 𝐵) ≠ ∅)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1537 ∈ wcel 2108 ≠ wne 2946 ∀wral 3067 ∃wrex 3076 ⊆ wss 3976 ∅c0 4352 ifcif 4548 class class class wbr 5166 ↦ cmpt 5249 dom cdm 5700 ran crn 5701 ⟶wf 6569 ‘cfv 6573 (class class class)co 7448 supcsup 9509 ℂcc 11182 ℝcr 11183 0cc0 11184 1c1 11185 + caddc 11187 ℝ^*cxr 11323 < clt 11324 ≤ cle 11325 − cmin 11520 / cdiv 11947 2c2 12348 ℤ_≥cuz 12903 ℝ⁺crp 13057 (,)cioo 13407 ⌊cfl 13841 abscabs 15283 lim supclsp 15516 lim_ℂ climc 25917 D cdv 25918

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-rep 5303 ax-sep 5317 ax-nul 5324 ax-pow 5383 ax-pr 5447 ax-un 7770 ax-cnex 11240 ax-resscn 11241 ax-1cn 11242 ax-icn 11243 ax-addcl 11244 ax-addrcl 11245 ax-mulcl 11246 ax-mulrcl 11247 ax-mulcom 11248 ax-addass 11249 ax-mulass 11250 ax-distr 11251 ax-i2m1 11252 ax-1ne0 11253 ax-1rid 11254 ax-rnegex 11255 ax-rrecex 11256 ax-cnre 11257 ax-pre-lttri 11258 ax-pre-lttrn 11259 ax-pre-ltadd 11260 ax-pre-mulgt0 11261 ax-pre-sup 11262 ax-addf 11263

This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1088 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-nel 3053 df-ral 3068 df-rex 3077 df-rmo 3388 df-reu 3389 df-rab 3444 df-v 3490 df-sbc 3805 df-csb 3922 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-pss 3996 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-tp 4653 df-op 4655 df-uni 4932 df-int 4971 df-iun 5017 df-iin 5018 df-br 5167 df-opab 5229 df-mpt 5250 df-tr 5284 df-id 5593 df-eprel 5599 df-po 5607 df-so 5608 df-fr 5652 df-se 5653 df-we 5654 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-pred 6332 df-ord 6398 df-on 6399 df-lim 6400 df-suc 6401 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-isom 6582 df-riota 7404 df-ov 7451 df-oprab 7452 df-mpo 7453 df-of 7714 df-om 7904 df-1st 8030 df-2nd 8031 df-supp 8202 df-frecs 8322 df-wrecs 8353 df-recs 8427 df-rdg 8466 df-1o 8522 df-2o 8523 df-er 8763 df-map 8886 df-pm 8887 df-ixp 8956 df-en 9004 df-dom 9005 df-sdom 9006 df-fin 9007 df-fsupp 9432 df-fi 9480 df-sup 9511 df-inf 9512 df-oi 9579 df-card 10008 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11522 df-neg 11523 df-div 11948 df-nn 12294 df-2 12356 df-3 12357 df-4 12358 df-5 12359 df-6 12360 df-7 12361 df-8 12362 df-9 12363 df-n0 12554 df-z 12640 df-dec 12759 df-uz 12904 df-q 13014 df-rp 13058 df-xneg 13175 df-xadd 13176 df-xmul 13177 df-ioo 13411 df-ico 13413 df-icc 13414 df-fz 13568 df-fzo 13712 df-fl 13843 df-seq 14053 df-exp 14113 df-hash 14380 df-cj 15148 df-re 15149 df-im 15150 df-sqrt 15284 df-abs 15285 df-limsup 15517 df-clim 15534 df-rlim 15535 df-struct 17194 df-sets 17211 df-slot 17229 df-ndx 17241 df-base 17259 df-ress 17288 df-plusg 17324 df-mulr 17325 df-starv 17326 df-sca 17327 df-vsca 17328 df-ip 17329 df-tset 17330 df-ple 17331 df-ds 17333 df-unif 17334 df-hom 17335 df-cco 17336 df-rest 17482 df-topn 17483 df-0g 17501 df-gsum 17502 df-topgen 17503 df-pt 17504 df-prds 17507 df-xrs 17562 df-qtop 17567 df-imas 17568 df-xps 17570 df-mre 17644 df-mrc 17645 df-acs 17647 df-mgm 18678 df-sgrp 18757 df-mnd 18773 df-submnd 18819 df-mulg 19108 df-cntz 19357 df-cmn 19824 df-psmet 21379 df-xmet 21380 df-met 21381 df-bl 21382 df-mopn 21383 df-fbas 21384 df-fg 21385 df-cnfld 21388 df-top 22921 df-topon 22938 df-topsp 22960 df-bases 22974 df-cld 23048 df-ntr 23049 df-cls 23050 df-nei 23127 df-lp 23165 df-perf 23166 df-cn 23256 df-cnp 23257 df-haus 23344 df-cmp 23416 df-tx 23591 df-hmeo 23784 df-fil 23875 df-fm 23967 df-flim 23968 df-flf 23969 df-xms 24351 df-ms 24352 df-tms 24353 df-cncf 24923 df-limc 25921 df-dv 25922

This theorem is referenced by: fourierdlem94 46121 fourierdlem113 46140

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