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Theorem cncfshiftioo 40586
Description: A periodic continuous function stays continuous if the domain is an open interval that is shifted a period. (Contributed by Glauco Siliprandi, 11-Dec-2019.)
Hypotheses
Ref Expression
cncfshiftioo.a (𝜑𝐴 ∈ ℝ)
cncfshiftioo.b (𝜑𝐵 ∈ ℝ)
cncfshiftioo.c 𝐶 = (𝐴(,)𝐵)
cncfshiftioo.t (𝜑𝑇 ∈ ℝ)
cncfshiftioo.d 𝐷 = ((𝐴 + 𝑇)(,)(𝐵 + 𝑇))
cncfshiftioo.f (𝜑𝐹 ∈ (𝐶cn→ℂ))
cncfshiftioo.g 𝐺 = (𝑥𝐷 ↦ (𝐹‘(𝑥𝑇)))
Assertion
Ref Expression
cncfshiftioo (𝜑𝐺 ∈ (𝐷cn→ℂ))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝐷   𝑥,𝐹   𝑥,𝑇   𝜑,𝑥
Allowed substitution hints:   𝐶(𝑥)   𝐺(𝑥)

Proof of Theorem cncfshiftioo
Dummy variables 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ioosscn 40201 . . . 4 (𝐴(,)𝐵) ⊆ ℂ
21a1i 11 . . 3 (𝜑 → (𝐴(,)𝐵) ⊆ ℂ)
3 cncfshiftioo.t . . . 4 (𝜑𝑇 ∈ ℝ)
43recnd 10356 . . 3 (𝜑𝑇 ∈ ℂ)
5 eqeq1 2817 . . . . . 6 (𝑤 = 𝑥 → (𝑤 = (𝑧 + 𝑇) ↔ 𝑥 = (𝑧 + 𝑇)))
65rexbidv 3247 . . . . 5 (𝑤 = 𝑥 → (∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇) ↔ ∃𝑧 ∈ (𝐴(,)𝐵)𝑥 = (𝑧 + 𝑇)))
7 oveq1 6884 . . . . . . 7 (𝑧 = 𝑦 → (𝑧 + 𝑇) = (𝑦 + 𝑇))
87eqeq2d 2823 . . . . . 6 (𝑧 = 𝑦 → (𝑥 = (𝑧 + 𝑇) ↔ 𝑥 = (𝑦 + 𝑇)))
98cbvrexv 3368 . . . . 5 (∃𝑧 ∈ (𝐴(,)𝐵)𝑥 = (𝑧 + 𝑇) ↔ ∃𝑦 ∈ (𝐴(,)𝐵)𝑥 = (𝑦 + 𝑇))
106, 9syl6bb 278 . . . 4 (𝑤 = 𝑥 → (∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇) ↔ ∃𝑦 ∈ (𝐴(,)𝐵)𝑥 = (𝑦 + 𝑇)))
1110cbvrabv 3396 . . 3 {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)} = {𝑥 ∈ ℂ ∣ ∃𝑦 ∈ (𝐴(,)𝐵)𝑥 = (𝑦 + 𝑇)}
12 cncfshiftioo.f . . . 4 (𝜑𝐹 ∈ (𝐶cn→ℂ))
13 cncfshiftioo.c . . . . 5 𝐶 = (𝐴(,)𝐵)
1413oveq1i 6887 . . . 4 (𝐶cn→ℂ) = ((𝐴(,)𝐵)–cn→ℂ)
1512, 14syl6eleq 2902 . . 3 (𝜑𝐹 ∈ ((𝐴(,)𝐵)–cn→ℂ))
16 eqid 2813 . . 3 (𝑥 ∈ {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)} ↦ (𝐹‘(𝑥𝑇))) = (𝑥 ∈ {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)} ↦ (𝐹‘(𝑥𝑇)))
172, 4, 11, 15, 16cncfshift 40568 . 2 (𝜑 → (𝑥 ∈ {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)} ↦ (𝐹‘(𝑥𝑇))) ∈ ({𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)}–cn→ℂ))
18 cncfshiftioo.g . . 3 𝐺 = (𝑥𝐷 ↦ (𝐹‘(𝑥𝑇)))
19 cncfshiftioo.d . . . . 5 𝐷 = ((𝐴 + 𝑇)(,)(𝐵 + 𝑇))
20 cncfshiftioo.a . . . . . 6 (𝜑𝐴 ∈ ℝ)
21 cncfshiftioo.b . . . . . 6 (𝜑𝐵 ∈ ℝ)
2220, 21, 3iooshift 40230 . . . . 5 (𝜑 → ((𝐴 + 𝑇)(,)(𝐵 + 𝑇)) = {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)})
2319, 22syl5eq 2859 . . . 4 (𝜑𝐷 = {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)})
2423mpteq1d 4939 . . 3 (𝜑 → (𝑥𝐷 ↦ (𝐹‘(𝑥𝑇))) = (𝑥 ∈ {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)} ↦ (𝐹‘(𝑥𝑇))))
2518, 24syl5eq 2859 . 2 (𝜑𝐺 = (𝑥 ∈ {𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)} ↦ (𝐹‘(𝑥𝑇))))
2623oveq1d 6892 . 2 (𝜑 → (𝐷cn→ℂ) = ({𝑤 ∈ ℂ ∣ ∃𝑧 ∈ (𝐴(,)𝐵)𝑤 = (𝑧 + 𝑇)}–cn→ℂ))
2717, 25, 263eltr4d 2907 1 (𝜑𝐺 ∈ (𝐷cn→ℂ))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1637  wcel 2157  wrex 3104  {crab 3107  wss 3776  cmpt 4930  cfv 6104  (class class class)co 6877  cc 10222  cr 10223   + caddc 10227  cmin 10554  (,)cioo 12396  cnccncf 22896
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1877  ax-4 1894  ax-5 2001  ax-6 2069  ax-7 2105  ax-8 2159  ax-9 2166  ax-10 2186  ax-11 2202  ax-12 2215  ax-13 2422  ax-ext 2791  ax-sep 4982  ax-nul 4990  ax-pow 5042  ax-pr 5103  ax-un 7182  ax-cnex 10280  ax-resscn 10281  ax-1cn 10282  ax-icn 10283  ax-addcl 10284  ax-addrcl 10285  ax-mulcl 10286  ax-mulrcl 10287  ax-mulcom 10288  ax-addass 10289  ax-mulass 10290  ax-distr 10291  ax-i2m1 10292  ax-1ne0 10293  ax-1rid 10294  ax-rnegex 10295  ax-rrecex 10296  ax-cnre 10297  ax-pre-lttri 10298  ax-pre-lttrn 10299  ax-pre-ltadd 10300
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 866  df-3or 1101  df-3an 1102  df-tru 1641  df-ex 1860  df-nf 1864  df-sb 2062  df-mo 2635  df-eu 2638  df-clab 2800  df-cleq 2806  df-clel 2809  df-nfc 2944  df-ne 2986  df-nel 3089  df-ral 3108  df-rex 3109  df-reu 3110  df-rab 3112  df-v 3400  df-sbc 3641  df-csb 3736  df-dif 3779  df-un 3781  df-in 3783  df-ss 3790  df-nul 4124  df-if 4287  df-pw 4360  df-sn 4378  df-pr 4380  df-op 4384  df-uni 4638  df-iun 4721  df-br 4852  df-opab 4914  df-mpt 4931  df-id 5226  df-po 5239  df-so 5240  df-xp 5324  df-rel 5325  df-cnv 5326  df-co 5327  df-dm 5328  df-rn 5329  df-res 5330  df-ima 5331  df-iota 6067  df-fun 6106  df-fn 6107  df-f 6108  df-f1 6109  df-fo 6110  df-f1o 6111  df-fv 6112  df-riota 6838  df-ov 6880  df-oprab 6881  df-mpt2 6882  df-1st 7401  df-2nd 7402  df-er 7982  df-map 8097  df-en 8196  df-dom 8197  df-sdom 8198  df-pnf 10364  df-mnf 10365  df-xr 10366  df-ltxr 10367  df-le 10368  df-sub 10556  df-neg 10557  df-ioo 12400  df-cncf 22898
This theorem is referenced by:  fourierdlem90  40893
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