knoppf - Mathbox for Asger C. Ipsen

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Theorem knoppf 36010

Description: Knopp's function is a function. (Contributed by Asger C. Ipsen, 25-Aug-2021.)

**Hypotheses**
Ref	Expression
knoppf.t	⊢ 𝑇 = (𝑥 ∈ ℝ ↦ (abs‘((⌊‘(𝑥 + (1 / 2))) − 𝑥)))
knoppf.f	⊢ 𝐹 = (𝑦 ∈ ℝ ↦ (𝑛 ∈ ℕ₀ ↦ ((𝐶↑𝑛) · (𝑇‘(((2 · 𝑁)↑𝑛) · 𝑦)))))
knoppf.w	⊢ 𝑊 = (𝑤 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖))
knoppf.c	⊢ (𝜑 → 𝐶 ∈ (-1(,)1))
knoppf.n	⊢ (𝜑 → 𝑁 ∈ ℕ)

**Assertion**
Ref	Expression
knoppf	⊢ (𝜑 → 𝑊:ℝ⟶ℝ)

Distinct variable groups: 𝐶,𝑛,𝑦 𝑖,𝐹,𝑤 𝑛,𝑁,𝑦 𝑥,𝑁 𝑇,𝑛,𝑦 𝜑,𝑖,𝑛,𝑤,𝑦 𝑥,𝑖,𝑤 Allowed substitution hints: 𝜑(𝑥) 𝐶(𝑥,𝑤,𝑖) 𝑇(𝑥,𝑤,𝑖) 𝐹(𝑥,𝑦,𝑛) 𝑁(𝑤,𝑖) 𝑊(𝑥,𝑦,𝑤,𝑖,𝑛)

Proof of Theorem knoppf Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nn0uz 12895	. . 3 ⊢ ℕ₀ = (ℤ_≥‘0)
2		0zd 12601	. . 3 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 0 ∈ ℤ)
3		eqidd 2729	. . 3 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ) ∧ 𝑖 ∈ ℕ₀) → ((𝐹‘𝑤)‘𝑖) = ((𝐹‘𝑤)‘𝑖))
4		knoppf.t	. . . 4 ⊢ 𝑇 = (𝑥 ∈ ℝ ↦ (abs‘((⌊‘(𝑥 + (1 / 2))) − 𝑥)))
5		knoppf.f	. . . 4 ⊢ 𝐹 = (𝑦 ∈ ℝ ↦ (𝑛 ∈ ℕ₀ ↦ ((𝐶↑𝑛) · (𝑇‘(((2 · 𝑁)↑𝑛) · 𝑦)))))
6		knoppf.n	. . . . . 6 ⊢ (𝜑 → 𝑁 ∈ ℕ)
7	6	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝑁 ∈ ℕ)
8	7	adantr 480	. . . 4 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ) ∧ 𝑖 ∈ ℕ₀) → 𝑁 ∈ ℕ)
9		knoppf.c	. . . . . . . 8 ⊢ (𝜑 → 𝐶 ∈ (-1(,)1))
10	9	knoppndvlem3 35989	. . . . . . 7 ⊢ (𝜑 → (𝐶 ∈ ℝ ∧ (abs‘𝐶) < 1))
11	10	simpld 494	. . . . . 6 ⊢ (𝜑 → 𝐶 ∈ ℝ)
12	11	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝐶 ∈ ℝ)
13	12	adantr 480	. . . 4 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ) ∧ 𝑖 ∈ ℕ₀) → 𝐶 ∈ ℝ)
14		simpr 484	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝑤 ∈ ℝ)
15	14	adantr 480	. . . 4 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ) ∧ 𝑖 ∈ ℕ₀) → 𝑤 ∈ ℝ)
16		simpr 484	. . . 4 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ) ∧ 𝑖 ∈ ℕ₀) → 𝑖 ∈ ℕ₀)
17	4, 5, 8, 13, 15, 16	knoppcnlem3 35970	. . 3 ⊢ (((𝜑 ∧ 𝑤 ∈ ℝ) ∧ 𝑖 ∈ ℕ₀) → ((𝐹‘𝑤)‘𝑖) ∈ ℝ)
18		knoppf.w	. . . . . 6 ⊢ 𝑊 = (𝑤 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖))
19		fveq2 6897	. . . . . . . . 9 ⊢ (𝑤 = 𝑧 → (𝐹‘𝑤) = (𝐹‘𝑧))
20	19	fveq1d 6899	. . . . . . . 8 ⊢ (𝑤 = 𝑧 → ((𝐹‘𝑤)‘𝑖) = ((𝐹‘𝑧)‘𝑖))
21	20	sumeq2sdv 15683	. . . . . . 7 ⊢ (𝑤 = 𝑧 → Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖) = Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑧)‘𝑖))
22	21	cbvmptv 5261	. . . . . 6 ⊢ (𝑤 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖)) = (𝑧 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑧)‘𝑖))
23	18, 22	eqtri 2756	. . . . 5 ⊢ 𝑊 = (𝑧 ∈ ℝ ↦ Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑧)‘𝑖))
24	9	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → 𝐶 ∈ (-1(,)1))
25	4, 5, 23, 14, 24, 7	knoppndvlem4 35990	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → seq0( + , (𝐹‘𝑤)) ⇝ (𝑊‘𝑤))
26		seqex 14001	. . . . 5 ⊢ seq0( + , (𝐹‘𝑤)) ∈ V
27		fvex 6910	. . . . 5 ⊢ (𝑊‘𝑤) ∈ V
28	26, 27	breldm 5911	. . . 4 ⊢ (seq0( + , (𝐹‘𝑤)) ⇝ (𝑊‘𝑤) → seq0( + , (𝐹‘𝑤)) ∈ dom ⇝ )
29	25, 28	syl 17	. . 3 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → seq0( + , (𝐹‘𝑤)) ∈ dom ⇝ )
30	1, 2, 3, 17, 29	isumrecl 15744	. 2 ⊢ ((𝜑 ∧ 𝑤 ∈ ℝ) → Σ𝑖 ∈ ℕ₀ ((𝐹‘𝑤)‘𝑖) ∈ ℝ)
31	30, 18	fmptd 7124	1 ⊢ (𝜑 → 𝑊:ℝ⟶ℝ)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 class class class wbr 5148 ↦ cmpt 5231 dom cdm 5678 ⟶wf 6544 ‘cfv 6548 (class class class)co 7420 ℝcr 11138 0cc0 11139 1c1 11140 + caddc 11142 · cmul 11144 < clt 11279 − cmin 11475 -cneg 11476 / cdiv 11902 ℕcn 12243 2c2 12298 ℕ₀cn0 12503 (,)cioo 13357 ⌊cfl 13788 seqcseq 13999 ↑cexp 14059 abscabs 15214 ⇝ cli 15461 Σcsu 15665

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-inf2 9665 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 ax-pre-sup 11217

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-se 5634 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-isom 6557 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-of 7685 df-om 7871 df-1st 7993 df-2nd 7994 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-1o 8487 df-er 8725 df-map 8847 df-pm 8848 df-en 8965 df-dom 8966 df-sdom 8967 df-fin 8968 df-sup 9466 df-inf 9467 df-oi 9534 df-card 9963 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-div 11903 df-nn 12244 df-2 12306 df-3 12307 df-n0 12504 df-z 12590 df-uz 12854 df-rp 13008 df-ioo 13361 df-ico 13363 df-fz 13518 df-fzo 13661 df-fl 13790 df-seq 14000 df-exp 14060 df-hash 14323 df-cj 15079 df-re 15080 df-im 15081 df-sqrt 15215 df-abs 15216 df-limsup 15448 df-clim 15465 df-rlim 15466 df-sum 15666 df-ulm 26326

This theorem is referenced by: knoppcn2 36011

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