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Theorem c1lip3 25880

Description: C^1 functions are Lipschitz continuous on closed intervals. (Contributed by Stefan O'Rear, 16-Nov-2014.)

**Hypotheses**
Ref	Expression
c1lip3.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
c1lip3.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
c1lip3.f	⊢ (𝜑 → (𝐹 ↾ ℝ) ∈ ((𝓑C^𝑛‘ℝ)‘1))
c1lip3.rn	⊢ (𝜑 → (𝐹 “ ℝ) ⊆ ℝ)
c1lip3.dm	⊢ (𝜑 → (𝐴[,]𝐵) ⊆ dom 𝐹)

**Assertion**
Ref	Expression
c1lip3	⊢ (𝜑 → ∃𝑘 ∈ ℝ ∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))))

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

**Proof of Theorem c1lip3**
Step	Hyp	Ref	Expression
1		c1lip3.a	. . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ)
2		c1lip3.b	. . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ)
3		c1lip3.f	. . 3 ⊢ (𝜑 → (𝐹 ↾ ℝ) ∈ ((𝓑C^𝑛‘ℝ)‘1))
4		df-ima 5644	. . . 4 ⊢ (𝐹 “ ℝ) = ran (𝐹 ↾ ℝ)
5		c1lip3.rn	. . . 4 ⊢ (𝜑 → (𝐹 “ ℝ) ⊆ ℝ)
6	4, 5	eqsstrrid 3983	. . 3 ⊢ (𝜑 → ran (𝐹 ↾ ℝ) ⊆ ℝ)
7		iccssre 13366	. . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ)
8	1, 2, 7	syl2anc 584	. . . . 5 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ ℝ)
9		c1lip3.dm	. . . . 5 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ dom 𝐹)
10	8, 9	ssind 4200	. . . 4 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ (ℝ ∩ dom 𝐹))
11		dmres 5972	. . . 4 ⊢ dom (𝐹 ↾ ℝ) = (ℝ ∩ dom 𝐹)
12	10, 11	sseqtrrdi 3985	. . 3 ⊢ (𝜑 → (𝐴[,]𝐵) ⊆ dom (𝐹 ↾ ℝ))
13	1, 2, 3, 6, 12	c1lip2 25879	. 2 ⊢ (𝜑 → ∃𝑘 ∈ ℝ ∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))))
14	8	sseld 3942	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (𝐴[,]𝐵) → 𝑥 ∈ ℝ))
15	8	sseld 3942	. . . . . . 7 ⊢ (𝜑 → (𝑦 ∈ (𝐴[,]𝐵) → 𝑦 ∈ ℝ))
16	14, 15	anim12d 609	. . . . . 6 ⊢ (𝜑 → ((𝑥 ∈ (𝐴[,]𝐵) ∧ 𝑦 ∈ (𝐴[,]𝐵)) → (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ)))
17	16	imp 406	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ (𝐴[,]𝐵) ∧ 𝑦 ∈ (𝐴[,]𝐵))) → (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ))
18		fvres 6859	. . . . . . . . 9 ⊢ (𝑦 ∈ ℝ → ((𝐹 ↾ ℝ)‘𝑦) = (𝐹‘𝑦))
19		fvres 6859	. . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → ((𝐹 ↾ ℝ)‘𝑥) = (𝐹‘𝑥))
20	18, 19	oveqan12rd 7389	. . . . . . . 8 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥)) = ((𝐹‘𝑦) − (𝐹‘𝑥)))
21	20	fveq2d 6844	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) = (abs‘((𝐹‘𝑦) − (𝐹‘𝑥))))
22	21	breq1d 5112	. . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → ((abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))) ↔ (abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥)))))
23	22	biimpd 229	. . . . 5 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → ((abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))) → (abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥)))))
24	17, 23	syl 17	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ (𝐴[,]𝐵) ∧ 𝑦 ∈ (𝐴[,]𝐵))) → ((abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))) → (abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥)))))
25	24	ralimdvva 3182	. . 3 ⊢ (𝜑 → (∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))) → ∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥)))))
26	25	reximdv 3148	. 2 ⊢ (𝜑 → (∃𝑘 ∈ ℝ ∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘(((𝐹 ↾ ℝ)‘𝑦) − ((𝐹 ↾ ℝ)‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))) → ∃𝑘 ∈ ℝ ∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥)))))
27	13, 26	mpd 15	1 ⊢ (𝜑 → ∃𝑘 ∈ ℝ ∀𝑥 ∈ (𝐴[,]𝐵)∀𝑦 ∈ (𝐴[,]𝐵)(abs‘((𝐹‘𝑦) − (𝐹‘𝑥))) ≤ (𝑘 · (abs‘(𝑦 − 𝑥))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2109 ∀wral 3044 ∃wrex 3053 ∩ cin 3910 ⊆ wss 3911 class class class wbr 5102 dom cdm 5631 ran crn 5632 ↾ cres 5633 “ cima 5634 ‘cfv 6499 (class class class)co 7369 ℝcr 11043 1c1 11045 · cmul 11049 ≤ cle 11185 − cmin 11381 [,]cicc 13285 abscabs 15176 𝓑C^𝑛ccpn 25742

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5229 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-inf2 9570 ax-cnex 11100 ax-resscn 11101 ax-1cn 11102 ax-icn 11103 ax-addcl 11104 ax-addrcl 11105 ax-mulcl 11106 ax-mulrcl 11107 ax-mulcom 11108 ax-addass 11109 ax-mulass 11110 ax-distr 11111 ax-i2m1 11112 ax-1ne0 11113 ax-1rid 11114 ax-rnegex 11115 ax-rrecex 11116 ax-cnre 11117 ax-pre-lttri 11118 ax-pre-lttrn 11119 ax-pre-ltadd 11120 ax-pre-mulgt0 11121 ax-pre-sup 11122 ax-addf 11123

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3351 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-tp 4590 df-op 4592 df-uni 4868 df-int 4907 df-iun 4953 df-iin 4954 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 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 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-isom 6508 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-of 7633 df-om 7823 df-1st 7947 df-2nd 7948 df-supp 8117 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-1o 8411 df-2o 8412 df-er 8648 df-map 8778 df-pm 8779 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-fsupp 9289 df-fi 9338 df-sup 9369 df-inf 9370 df-oi 9439 df-card 9868 df-pnf 11186 df-mnf 11187 df-xr 11188 df-ltxr 11189 df-le 11190 df-sub 11383 df-neg 11384 df-div 11812 df-nn 12163 df-2 12225 df-3 12226 df-4 12227 df-5 12228 df-6 12229 df-7 12230 df-8 12231 df-9 12232 df-n0 12419 df-z 12506 df-dec 12626 df-uz 12770 df-q 12884 df-rp 12928 df-xneg 13048 df-xadd 13049 df-xmul 13050 df-ioo 13286 df-ico 13288 df-icc 13289 df-fz 13445 df-fzo 13592 df-seq 13943 df-exp 14003 df-hash 14272 df-cj 15041 df-re 15042 df-im 15043 df-sqrt 15177 df-abs 15178 df-struct 17093 df-sets 17110 df-slot 17128 df-ndx 17140 df-base 17156 df-ress 17177 df-plusg 17209 df-mulr 17210 df-starv 17211 df-sca 17212 df-vsca 17213 df-ip 17214 df-tset 17215 df-ple 17216 df-ds 17218 df-unif 17219 df-hom 17220 df-cco 17221 df-rest 17361 df-topn 17362 df-0g 17380 df-gsum 17381 df-topgen 17382 df-pt 17383 df-prds 17386 df-xrs 17441 df-qtop 17446 df-imas 17447 df-xps 17449 df-mre 17523 df-mrc 17524 df-acs 17526 df-mgm 18543 df-sgrp 18622 df-mnd 18638 df-submnd 18687 df-mulg 18976 df-cntz 19225 df-cmn 19688 df-psmet 21232 df-xmet 21233 df-met 21234 df-bl 21235 df-mopn 21236 df-fbas 21237 df-fg 21238 df-cnfld 21241 df-top 22757 df-topon 22774 df-topsp 22796 df-bases 22809 df-cld 22882 df-ntr 22883 df-cls 22884 df-nei 22961 df-lp 22999 df-perf 23000 df-cn 23090 df-cnp 23091 df-haus 23178 df-cmp 23250 df-tx 23425 df-hmeo 23618 df-fil 23709 df-fm 23801 df-flim 23802 df-flf 23803 df-xms 24184 df-ms 24185 df-tms 24186 df-cncf 24747 df-limc 25743 df-dv 25744 df-dvn 25745 df-cpn 25746

This theorem is referenced by: aalioulem3 26218

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