signstf0 - Mathbox for Thierry Arnoux

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Theorem signstf0 33579

Description: Sign of a single letter word. (Contributed by Thierry Arnoux, 8-Oct-2018.)

**Hypotheses**
Ref	Expression
signsv.p	⊢ ⨣ = (𝑎 ∈ {-1, 0, 1}, 𝑏 ∈ {-1, 0, 1} ↦ if(𝑏 = 0, 𝑎, 𝑏))
signsv.w	⊢ 𝑊 = {⟨(Base‘ndx), {-1, 0, 1}⟩, ⟨(+_g‘ndx), ⨣ ⟩}
signsv.t	⊢ 𝑇 = (𝑓 ∈ Word ℝ ↦ (𝑛 ∈ (0..^(♯‘𝑓)) ↦ (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(𝑓‘𝑖))))))
signsv.v	⊢ 𝑉 = (𝑓 ∈ Word ℝ ↦ Σ𝑗 ∈ (1..^(♯‘𝑓))if(((𝑇‘𝑓)‘𝑗) ≠ ((𝑇‘𝑓)‘(𝑗 − 1)), 1, 0))

**Assertion**
Ref	Expression
signstf0	⊢ (𝐾 ∈ ℝ → (𝑇‘⟨“𝐾”⟩) = ⟨“(sgn‘𝐾)”⟩)

Distinct variable groups: 𝑎,𝑏, ⨣ 𝑓,𝑖,𝑛,𝑊 𝑓,𝐾,𝑖,𝑛 Allowed substitution hints: ⨣ (𝑓,𝑖,𝑗,𝑛) 𝑇(𝑓,𝑖,𝑗,𝑛,𝑎,𝑏) 𝐾(𝑗,𝑎,𝑏) 𝑉(𝑓,𝑖,𝑗,𝑛,𝑎,𝑏) 𝑊(𝑗,𝑎,𝑏)

**Proof of Theorem signstf0**
Step	Hyp	Ref	Expression
1		s1len 14556	. . . . . 6 ⊢ (♯‘⟨“𝐾”⟩) = 1
2	1	oveq2i 7420	. . . . 5 ⊢ (0..^(♯‘⟨“𝐾”⟩)) = (0..^1)
3		fzo01 13714	. . . . 5 ⊢ (0..^1) = {0}
4	2, 3	eqtri 2761	. . . 4 ⊢ (0..^(♯‘⟨“𝐾”⟩)) = {0}
5	4	a1i 11	. . 3 ⊢ (𝐾 ∈ ℝ → (0..^(♯‘⟨“𝐾”⟩)) = {0})
6		simpr 486	. . . . . 6 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩)))
7	6, 4	eleqtrdi 2844	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → 𝑛 ∈ {0})
8		velsn 4645	. . . . 5 ⊢ (𝑛 ∈ {0} ↔ 𝑛 = 0)
9	7, 8	sylib 217	. . . 4 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → 𝑛 = 0)
10		oveq2 7417	. . . . . . . . 9 ⊢ (𝑛 = 0 → (0...𝑛) = (0...0))
11		0z 12569	. . . . . . . . . 10 ⊢ 0 ∈ ℤ
12		fzsn 13543	. . . . . . . . . 10 ⊢ (0 ∈ ℤ → (0...0) = {0})
13	11, 12	ax-mp 5	. . . . . . . . 9 ⊢ (0...0) = {0}
14	10, 13	eqtrdi 2789	. . . . . . . 8 ⊢ (𝑛 = 0 → (0...𝑛) = {0})
15	14	mpteq1d 5244	. . . . . . 7 ⊢ (𝑛 = 0 → (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))) = (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))))
16	15	oveq2d 7425	. . . . . 6 ⊢ (𝑛 = 0 → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))))
17	16	adantl 483	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))))
18		signsv.p	. . . . . . . . 9 ⊢ ⨣ = (𝑎 ∈ {-1, 0, 1}, 𝑏 ∈ {-1, 0, 1} ↦ if(𝑏 = 0, 𝑎, 𝑏))
19		signsv.w	. . . . . . . . 9 ⊢ 𝑊 = {⟨(Base‘ndx), {-1, 0, 1}⟩, ⟨(+_g‘ndx), ⨣ ⟩}
20	18, 19	signswmnd 33568	. . . . . . . 8 ⊢ 𝑊 ∈ Mnd
21	20	a1i 11	. . . . . . 7 ⊢ (𝐾 ∈ ℝ → 𝑊 ∈ Mnd)
22		0re 11216	. . . . . . . 8 ⊢ 0 ∈ ℝ
23	22	a1i 11	. . . . . . 7 ⊢ (𝐾 ∈ ℝ → 0 ∈ ℝ)
24		s1fv 14560	. . . . . . . . . 10 ⊢ (𝐾 ∈ ℝ → (⟨“𝐾”⟩‘0) = 𝐾)
25		id 22	. . . . . . . . . 10 ⊢ (𝐾 ∈ ℝ → 𝐾 ∈ ℝ)
26	24, 25	eqeltrd 2834	. . . . . . . . 9 ⊢ (𝐾 ∈ ℝ → (⟨“𝐾”⟩‘0) ∈ ℝ)
27	26	rexrd 11264	. . . . . . . 8 ⊢ (𝐾 ∈ ℝ → (⟨“𝐾”⟩‘0) ∈ ℝ^*)
28		sgncl 33537	. . . . . . . 8 ⊢ ((⟨“𝐾”⟩‘0) ∈ ℝ^* → (sgn‘(⟨“𝐾”⟩‘0)) ∈ {-1, 0, 1})
29	27, 28	syl 17	. . . . . . 7 ⊢ (𝐾 ∈ ℝ → (sgn‘(⟨“𝐾”⟩‘0)) ∈ {-1, 0, 1})
30	18, 19	signswbase 33565	. . . . . . . 8 ⊢ {-1, 0, 1} = (Base‘𝑊)
31		2fveq3 6897	. . . . . . . 8 ⊢ (𝑖 = 0 → (sgn‘(⟨“𝐾”⟩‘𝑖)) = (sgn‘(⟨“𝐾”⟩‘0)))
32	30, 31	gsumsn 19822	. . . . . . 7 ⊢ ((𝑊 ∈ Mnd ∧ 0 ∈ ℝ ∧ (sgn‘(⟨“𝐾”⟩‘0)) ∈ {-1, 0, 1}) → (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘(⟨“𝐾”⟩‘0)))
33	21, 23, 29, 32	syl3anc 1372	. . . . . 6 ⊢ (𝐾 ∈ ℝ → (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘(⟨“𝐾”⟩‘0)))
34	33	adantr 482	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘(⟨“𝐾”⟩‘0)))
35	24	fveq2d 6896	. . . . . 6 ⊢ (𝐾 ∈ ℝ → (sgn‘(⟨“𝐾”⟩‘0)) = (sgn‘𝐾))
36	35	adantr 482	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (sgn‘(⟨“𝐾”⟩‘0)) = (sgn‘𝐾))
37	17, 34, 36	3eqtrd 2777	. . . 4 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘𝐾))
38	9, 37	syldan 592	. . 3 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘𝐾))
39	5, 38	mpteq12dva 5238	. 2 ⊢ (𝐾 ∈ ℝ → (𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩)) ↦ (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))))) = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
40		s1cl 14552	. . 3 ⊢ (𝐾 ∈ ℝ → ⟨“𝐾”⟩ ∈ Word ℝ)
41		signsv.t	. . . 4 ⊢ 𝑇 = (𝑓 ∈ Word ℝ ↦ (𝑛 ∈ (0..^(♯‘𝑓)) ↦ (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(𝑓‘𝑖))))))
42		signsv.v	. . . 4 ⊢ 𝑉 = (𝑓 ∈ Word ℝ ↦ Σ𝑗 ∈ (1..^(♯‘𝑓))if(((𝑇‘𝑓)‘𝑗) ≠ ((𝑇‘𝑓)‘(𝑗 − 1)), 1, 0))
43	18, 19, 41, 42	signstfv 33574	. . 3 ⊢ (⟨“𝐾”⟩ ∈ Word ℝ → (𝑇‘⟨“𝐾”⟩) = (𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩)) ↦ (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))))))
44	40, 43	syl 17	. 2 ⊢ (𝐾 ∈ ℝ → (𝑇‘⟨“𝐾”⟩) = (𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩)) ↦ (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))))))
45		sgnclre 33538	. . . 4 ⊢ (𝐾 ∈ ℝ → (sgn‘𝐾) ∈ ℝ)
46		s1val 14548	. . . 4 ⊢ ((sgn‘𝐾) ∈ ℝ → ⟨“(sgn‘𝐾)”⟩ = {⟨0, (sgn‘𝐾)⟩})
47	45, 46	syl 17	. . 3 ⊢ (𝐾 ∈ ℝ → ⟨“(sgn‘𝐾)”⟩ = {⟨0, (sgn‘𝐾)⟩})
48		fmptsn 7165	. . . 4 ⊢ ((0 ∈ ℝ ∧ (sgn‘𝐾) ∈ ℝ) → {⟨0, (sgn‘𝐾)⟩} = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
49	22, 45, 48	sylancr 588	. . 3 ⊢ (𝐾 ∈ ℝ → {⟨0, (sgn‘𝐾)⟩} = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
50	47, 49	eqtrd 2773	. 2 ⊢ (𝐾 ∈ ℝ → ⟨“(sgn‘𝐾)”⟩ = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
51	39, 44, 50	3eqtr4d 2783	1 ⊢ (𝐾 ∈ ℝ → (𝑇‘⟨“𝐾”⟩) = ⟨“(sgn‘𝐾)”⟩)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2941 ifcif 4529 {csn 4629 {cpr 4631 {ctp 4633 ⟨cop 4635 ↦ cmpt 5232 ‘cfv 6544 (class class class)co 7409 ∈ cmpo 7411 ℝcr 11109 0cc0 11110 1c1 11111 ℝ^*cxr 11247 − cmin 11444 -cneg 11445 ℤcz 12558 ...cfz 13484 ..^cfzo 13627 ♯chash 14290 Word cword 14464 ⟨“cs1 14545 sgncsgn 15033 Σcsu 15632 ndxcnx 17126 Basecbs 17144 +_gcplusg 17197 Σ_g cgsu 17386 Mndcmnd 18625

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-se 5633 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-isom 6553 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-supp 8147 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-oi 9505 df-card 9934 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-nn 12213 df-2 12275 df-n0 12473 df-z 12559 df-uz 12823 df-fz 13485 df-fzo 13628 df-seq 13967 df-hash 14291 df-word 14465 df-s1 14546 df-sgn 15034 df-struct 17080 df-slot 17115 df-ndx 17127 df-base 17145 df-plusg 17210 df-0g 17387 df-gsum 17388 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-mulg 18951 df-cntz 19181

This theorem is referenced by: signsvtn0 33581 signstfvneq0 33583

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