fourierclimd - Mathbox for Glauco Siliprandi

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Theorem fourierclimd 44624

Description: Fourier series convergence, for piecewise smooth functions. See fourierd 44623 for the analogous Σ equation. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
fourierclimd.f	⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
fourierclimd.t	⊢ 𝑇 = (2 · π)
fourierclimd.per	⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝐹‘(𝑥 + 𝑇)) = (𝐹‘𝑥))
fourierclimd.g	⊢ 𝐺 = ((ℝ D 𝐹) ↾ (-π(,)π))
fourierclimd.dmdv	⊢ (𝜑 → ((-π(,)π) ∖ dom 𝐺) ∈ Fin)
fourierclimd.dvcn	⊢ (𝜑 → 𝐺 ∈ (dom 𝐺–cn→ℂ))
fourierclimd.rlim	⊢ ((𝜑 ∧ 𝑥 ∈ ((-π[,)π) ∖ dom 𝐺)) → ((𝐺 ↾ (𝑥(,)+∞)) lim_ℂ 𝑥) ≠ ∅)
fourierclimd.llim	⊢ ((𝜑 ∧ 𝑥 ∈ ((-π(,]π) ∖ dom 𝐺)) → ((𝐺 ↾ (-∞(,)𝑥)) lim_ℂ 𝑥) ≠ ∅)
fourierclimd.x	⊢ (𝜑 → 𝑋 ∈ ℝ)
fourierclimd.l	⊢ (𝜑 → 𝐿 ∈ ((𝐹 ↾ (-∞(,)𝑋)) lim_ℂ 𝑋))
fourierclimd.r	⊢ (𝜑 → 𝑅 ∈ ((𝐹 ↾ (𝑋(,)+∞)) lim_ℂ 𝑋))
fourierclimd.a	⊢ 𝐴 = (𝑛 ∈ ℕ₀ ↦ (∫(-π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π))
fourierclimd.b	⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π))
fourierclimd.s	⊢ 𝑆 = (𝑛 ∈ ℕ ↦ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))

**Assertion**
Ref	Expression
fourierclimd	⊢ (𝜑 → seq1( + , 𝑆) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)))

Distinct variable groups: 𝑛,𝐹,𝑥 𝑥,𝐺 𝑥,𝑇 𝑛,𝑋,𝑥 𝜑,𝑥 Allowed substitution hints: 𝜑(𝑛) 𝐴(𝑥,𝑛) 𝐵(𝑥,𝑛) 𝑅(𝑥,𝑛) 𝑆(𝑥,𝑛) 𝑇(𝑛) 𝐺(𝑛) 𝐿(𝑥,𝑛)

Proof of Theorem fourierclimd Dummy variable 𝑘 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		fourierclimd.f	. . 3 ⊢ (𝜑 → 𝐹:ℝ⟶ℝ)
2		fourierclimd.t	. . 3 ⊢ 𝑇 = (2 · π)
3		fourierclimd.per	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝐹‘(𝑥 + 𝑇)) = (𝐹‘𝑥))
4		fourierclimd.g	. . 3 ⊢ 𝐺 = ((ℝ D 𝐹) ↾ (-π(,)π))
5		fourierclimd.dmdv	. . 3 ⊢ (𝜑 → ((-π(,)π) ∖ dom 𝐺) ∈ Fin)
6		fourierclimd.dvcn	. . 3 ⊢ (𝜑 → 𝐺 ∈ (dom 𝐺–cn→ℂ))
7		fourierclimd.rlim	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ ((-π[,)π) ∖ dom 𝐺)) → ((𝐺 ↾ (𝑥(,)+∞)) lim_ℂ 𝑥) ≠ ∅)
8		fourierclimd.llim	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ ((-π(,]π) ∖ dom 𝐺)) → ((𝐺 ↾ (-∞(,)𝑥)) lim_ℂ 𝑥) ≠ ∅)
9		fourierclimd.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ ℝ)
10		fourierclimd.l	. . 3 ⊢ (𝜑 → 𝐿 ∈ ((𝐹 ↾ (-∞(,)𝑋)) lim_ℂ 𝑋))
11		fourierclimd.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ ((𝐹 ↾ (𝑋(,)+∞)) lim_ℂ 𝑋))
12		fourierclimd.a	. . 3 ⊢ 𝐴 = (𝑛 ∈ ℕ₀ ↦ (∫(-π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π))
13		fourierclimd.b	. . 3 ⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π))
14		fourierclimd.s	. . . 4 ⊢ 𝑆 = (𝑛 ∈ ℕ ↦ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))))
15		nfcv 2902	. . . . 5 ⊢ Ⅎ𝑘(((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))
16		nfmpt1 5240	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝑛 ∈ ℕ₀ ↦ (∫(-π(,)π)((𝐹‘𝑥) · (cos‘(𝑛 · 𝑥))) d𝑥 / π))
17	12, 16	nfcxfr 2900	. . . . . . . 8 ⊢ Ⅎ𝑛𝐴
18		nfcv 2902	. . . . . . . 8 ⊢ Ⅎ𝑛𝑘
19	17, 18	nffv 6879	. . . . . . 7 ⊢ Ⅎ𝑛(𝐴‘𝑘)
20		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑛 ·
21		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑛(cos‘(𝑘 · 𝑋))
22	19, 20, 21	nfov 7414	. . . . . 6 ⊢ Ⅎ𝑛((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋)))
23		nfcv 2902	. . . . . 6 ⊢ Ⅎ𝑛 +
24		nfmpt1 5240	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝑛 ∈ ℕ ↦ (∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑛 · 𝑥))) d𝑥 / π))
25	13, 24	nfcxfr 2900	. . . . . . . 8 ⊢ Ⅎ𝑛𝐵
26	25, 18	nffv 6879	. . . . . . 7 ⊢ Ⅎ𝑛(𝐵‘𝑘)
27		nfcv 2902	. . . . . . 7 ⊢ Ⅎ𝑛(sin‘(𝑘 · 𝑋))
28	26, 20, 27	nfov 7414	. . . . . 6 ⊢ Ⅎ𝑛((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))
29	22, 23, 28	nfov 7414	. . . . 5 ⊢ Ⅎ𝑛(((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))
30		fveq2 6869	. . . . . . 7 ⊢ (𝑛 = 𝑘 → (𝐴‘𝑛) = (𝐴‘𝑘))
31		oveq1 7391	. . . . . . . 8 ⊢ (𝑛 = 𝑘 → (𝑛 · 𝑋) = (𝑘 · 𝑋))
32	31	fveq2d 6873	. . . . . . 7 ⊢ (𝑛 = 𝑘 → (cos‘(𝑛 · 𝑋)) = (cos‘(𝑘 · 𝑋)))
33	30, 32	oveq12d 7402	. . . . . 6 ⊢ (𝑛 = 𝑘 → ((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) = ((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))))
34		fveq2 6869	. . . . . . 7 ⊢ (𝑛 = 𝑘 → (𝐵‘𝑛) = (𝐵‘𝑘))
35	31	fveq2d 6873	. . . . . . 7 ⊢ (𝑛 = 𝑘 → (sin‘(𝑛 · 𝑋)) = (sin‘(𝑘 · 𝑋)))
36	34, 35	oveq12d 7402	. . . . . 6 ⊢ (𝑛 = 𝑘 → ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))) = ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋))))
37	33, 36	oveq12d 7402	. . . . 5 ⊢ (𝑛 = 𝑘 → (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋)))) = (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
38	15, 29, 37	cbvmpt 5243	. . . 4 ⊢ (𝑛 ∈ ℕ ↦ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = (𝑘 ∈ ℕ ↦ (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
39	14, 38	eqtri 2759	. . 3 ⊢ 𝑆 = (𝑘 ∈ ℕ ↦ (((𝐴‘𝑘) · (cos‘(𝑘 · 𝑋))) + ((𝐵‘𝑘) · (sin‘(𝑘 · 𝑋)))))
40	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 39	fourierdlem115 44622	. 2 ⊢ (𝜑 → (seq1( + , 𝑆) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)) ∧ (((𝐴‘0) / 2) + Σ𝑛 ∈ ℕ (((𝐴‘𝑛) · (cos‘(𝑛 · 𝑋))) + ((𝐵‘𝑛) · (sin‘(𝑛 · 𝑋))))) = ((𝐿 + 𝑅) / 2)))
41	40	simpld 495	1 ⊢ (𝜑 → seq1( + , 𝑆) ⇝ (((𝐿 + 𝑅) / 2) − ((𝐴‘0) / 2)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ≠ wne 2939 ∖ cdif 3932 ∅c0 4309 class class class wbr 5132 ↦ cmpt 5215 dom cdm 5660 ↾ cres 5662 ⟶wf 6519 ‘cfv 6523 (class class class)co 7384 Fincfn 8912 ℂcc 11080 ℝcr 11081 0cc0 11082 1c1 11083 + caddc 11085 · cmul 11087 +∞cpnf 11217 -∞cmnf 11218 − cmin 11416 -cneg 11417 / cdiv 11843 ℕcn 12184 2c2 12239 ℕ₀cn0 12444 (,)cioo 13296 (,]cioc 13297 [,)cico 13298 seqcseq 13938 ⇝ cli 15400 Σcsu 15604 sincsin 15979 cosccos 15980 πcpi 15982 –cn→ccncf 24298 ∫citg 25041 lim_ℂ climc 25285 D cdv 25286

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2702 ax-rep 5269 ax-sep 5283 ax-nul 5290 ax-pow 5347 ax-pr 5411 ax-un 7699 ax-inf2 9608 ax-cc 10402 ax-cnex 11138 ax-resscn 11139 ax-1cn 11140 ax-icn 11141 ax-addcl 11142 ax-addrcl 11143 ax-mulcl 11144 ax-mulrcl 11145 ax-mulcom 11146 ax-addass 11147 ax-mulass 11148 ax-distr 11149 ax-i2m1 11150 ax-1ne0 11151 ax-1rid 11152 ax-rnegex 11153 ax-rrecex 11154 ax-cnre 11155 ax-pre-lttri 11156 ax-pre-lttrn 11157 ax-pre-ltadd 11158 ax-pre-mulgt0 11159 ax-pre-sup 11160 ax-addf 11161 ax-mulf 11162

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3371 df-reu 3372 df-rab 3426 df-v 3468 df-sbc 3765 df-csb 3881 df-dif 3938 df-un 3940 df-in 3942 df-ss 3952 df-pss 3954 df-symdif 4229 df-nul 4310 df-if 4514 df-pw 4589 df-sn 4614 df-pr 4616 df-tp 4618 df-op 4620 df-uni 4893 df-int 4935 df-iun 4983 df-iin 4984 df-disj 5098 df-br 5133 df-opab 5195 df-mpt 5216 df-tr 5250 df-id 5558 df-eprel 5564 df-po 5572 df-so 5573 df-fr 5615 df-se 5616 df-we 5617 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-pred 6280 df-ord 6347 df-on 6348 df-lim 6349 df-suc 6350 df-iota 6475 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-isom 6532 df-riota 7340 df-ov 7387 df-oprab 7388 df-mpo 7389 df-of 7644 df-ofr 7645 df-om 7830 df-1st 7948 df-2nd 7949 df-supp 8120 df-frecs 8239 df-wrecs 8270 df-recs 8344 df-rdg 8383 df-1o 8439 df-2o 8440 df-oadd 8443 df-omul 8444 df-er 8677 df-map 8796 df-pm 8797 df-ixp 8865 df-en 8913 df-dom 8914 df-sdom 8915 df-fin 8916 df-fsupp 9335 df-fi 9378 df-sup 9409 df-inf 9410 df-oi 9477 df-dju 9868 df-card 9906 df-acn 9909 df-pnf 11222 df-mnf 11223 df-xr 11224 df-ltxr 11225 df-le 11226 df-sub 11418 df-neg 11419 df-div 11844 df-nn 12185 df-2 12247 df-3 12248 df-4 12249 df-5 12250 df-6 12251 df-7 12252 df-8 12253 df-9 12254 df-n0 12445 df-xnn0 12517 df-z 12531 df-dec 12650 df-uz 12795 df-q 12905 df-rp 12947 df-xneg 13064 df-xadd 13065 df-xmul 13066 df-ioo 13300 df-ioc 13301 df-ico 13302 df-icc 13303 df-fz 13457 df-fzo 13600 df-fl 13729 df-mod 13807 df-seq 13939 df-exp 14000 df-fac 14206 df-bc 14235 df-hash 14263 df-shft 14986 df-cj 15018 df-re 15019 df-im 15020 df-sqrt 15154 df-abs 15155 df-limsup 15387 df-clim 15404 df-rlim 15405 df-sum 15605 df-ef 15983 df-sin 15985 df-cos 15986 df-pi 15988 df-struct 17052 df-sets 17069 df-slot 17087 df-ndx 17099 df-base 17117 df-ress 17146 df-plusg 17182 df-mulr 17183 df-starv 17184 df-sca 17185 df-vsca 17186 df-ip 17187 df-tset 17188 df-ple 17189 df-ds 17191 df-unif 17192 df-hom 17193 df-cco 17194 df-rest 17340 df-topn 17341 df-0g 17359 df-gsum 17360 df-topgen 17361 df-pt 17362 df-prds 17365 df-xrs 17420 df-qtop 17425 df-imas 17426 df-xps 17428 df-mre 17502 df-mrc 17503 df-acs 17505 df-mgm 18533 df-sgrp 18582 df-mnd 18593 df-submnd 18638 df-mulg 18909 df-cntz 19133 df-cmn 19600 df-psmet 20847 df-xmet 20848 df-met 20849 df-bl 20850 df-mopn 20851 df-fbas 20852 df-fg 20853 df-cnfld 20856 df-top 22302 df-topon 22319 df-topsp 22341 df-bases 22355 df-cld 22429 df-ntr 22430 df-cls 22431 df-nei 22508 df-lp 22546 df-perf 22547 df-cn 22637 df-cnp 22638 df-t1 22724 df-haus 22725 df-cmp 22797 df-tx 22972 df-hmeo 23165 df-fil 23256 df-fm 23348 df-flim 23349 df-flf 23350 df-xms 23732 df-ms 23733 df-tms 23734 df-cncf 24300 df-ovol 24887 df-vol 24888 df-mbf 25042 df-itg1 25043 df-itg2 25044 df-ibl 25045 df-itg 25046 df-0p 25093 df-ditg 25270 df-limc 25289 df-dv 25290

This theorem is referenced by: fourierclim 44625

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