signstf0 - Mathbox for Thierry Arnoux

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Theorem signstf0 33648

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 14558	. . . . . 6 ⊢ (♯‘⟨“𝐾”⟩) = 1
2	1	oveq2i 7422	. . . . 5 ⊢ (0..^(♯‘⟨“𝐾”⟩)) = (0..^1)
3		fzo01 13716	. . . . 5 ⊢ (0..^1) = {0}
4	2, 3	eqtri 2760	. . . 4 ⊢ (0..^(♯‘⟨“𝐾”⟩)) = {0}
5	4	a1i 11	. . 3 ⊢ (𝐾 ∈ ℝ → (0..^(♯‘⟨“𝐾”⟩)) = {0})
6		simpr 485	. . . . . 6 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩)))
7	6, 4	eleqtrdi 2843	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → 𝑛 ∈ {0})
8		velsn 4644	. . . . 5 ⊢ (𝑛 ∈ {0} ↔ 𝑛 = 0)
9	7, 8	sylib 217	. . . 4 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → 𝑛 = 0)
10		oveq2 7419	. . . . . . . . 9 ⊢ (𝑛 = 0 → (0...𝑛) = (0...0))
11		0z 12571	. . . . . . . . . 10 ⊢ 0 ∈ ℤ
12		fzsn 13545	. . . . . . . . . 10 ⊢ (0 ∈ ℤ → (0...0) = {0})
13	11, 12	ax-mp 5	. . . . . . . . 9 ⊢ (0...0) = {0}
14	10, 13	eqtrdi 2788	. . . . . . . 8 ⊢ (𝑛 = 0 → (0...𝑛) = {0})
15	14	mpteq1d 5243	. . . . . . 7 ⊢ (𝑛 = 0 → (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))) = (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))))
16	15	oveq2d 7427	. . . . . 6 ⊢ (𝑛 = 0 → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))))
17	16	adantl 482	. . . . 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 33637	. . . . . . . 8 ⊢ 𝑊 ∈ Mnd
21	20	a1i 11	. . . . . . 7 ⊢ (𝐾 ∈ ℝ → 𝑊 ∈ Mnd)
22		0re 11218	. . . . . . . 8 ⊢ 0 ∈ ℝ
23	22	a1i 11	. . . . . . 7 ⊢ (𝐾 ∈ ℝ → 0 ∈ ℝ)
24		s1fv 14562	. . . . . . . . . 10 ⊢ (𝐾 ∈ ℝ → (⟨“𝐾”⟩‘0) = 𝐾)
25		id 22	. . . . . . . . . 10 ⊢ (𝐾 ∈ ℝ → 𝐾 ∈ ℝ)
26	24, 25	eqeltrd 2833	. . . . . . . . 9 ⊢ (𝐾 ∈ ℝ → (⟨“𝐾”⟩‘0) ∈ ℝ)
27	26	rexrd 11266	. . . . . . . 8 ⊢ (𝐾 ∈ ℝ → (⟨“𝐾”⟩‘0) ∈ ℝ^*)
28		sgncl 33606	. . . . . . . 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 33634	. . . . . . . 8 ⊢ {-1, 0, 1} = (Base‘𝑊)
31		2fveq3 6896	. . . . . . . 8 ⊢ (𝑖 = 0 → (sgn‘(⟨“𝐾”⟩‘𝑖)) = (sgn‘(⟨“𝐾”⟩‘0)))
32	30, 31	gsumsn 19824	. . . . . . 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 1371	. . . . . 6 ⊢ (𝐾 ∈ ℝ → (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘(⟨“𝐾”⟩‘0)))
34	33	adantr 481	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (𝑊 Σ_g (𝑖 ∈ {0} ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘(⟨“𝐾”⟩‘0)))
35	24	fveq2d 6895	. . . . . 6 ⊢ (𝐾 ∈ ℝ → (sgn‘(⟨“𝐾”⟩‘0)) = (sgn‘𝐾))
36	35	adantr 481	. . . . 5 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (sgn‘(⟨“𝐾”⟩‘0)) = (sgn‘𝐾))
37	17, 34, 36	3eqtrd 2776	. . . 4 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 = 0) → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘𝐾))
38	9, 37	syldan 591	. . 3 ⊢ ((𝐾 ∈ ℝ ∧ 𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩))) → (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖)))) = (sgn‘𝐾))
39	5, 38	mpteq12dva 5237	. 2 ⊢ (𝐾 ∈ ℝ → (𝑛 ∈ (0..^(♯‘⟨“𝐾”⟩)) ↦ (𝑊 Σ_g (𝑖 ∈ (0...𝑛) ↦ (sgn‘(⟨“𝐾”⟩‘𝑖))))) = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
40		s1cl 14554	. . 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 33643	. . 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 33607	. . . 4 ⊢ (𝐾 ∈ ℝ → (sgn‘𝐾) ∈ ℝ)
46		s1val 14550	. . . 4 ⊢ ((sgn‘𝐾) ∈ ℝ → ⟨“(sgn‘𝐾)”⟩ = {⟨0, (sgn‘𝐾)⟩})
47	45, 46	syl 17	. . 3 ⊢ (𝐾 ∈ ℝ → ⟨“(sgn‘𝐾)”⟩ = {⟨0, (sgn‘𝐾)⟩})
48		fmptsn 7167	. . . 4 ⊢ ((0 ∈ ℝ ∧ (sgn‘𝐾) ∈ ℝ) → {⟨0, (sgn‘𝐾)⟩} = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
49	22, 45, 48	sylancr 587	. . 3 ⊢ (𝐾 ∈ ℝ → {⟨0, (sgn‘𝐾)⟩} = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
50	47, 49	eqtrd 2772	. 2 ⊢ (𝐾 ∈ ℝ → ⟨“(sgn‘𝐾)”⟩ = (𝑛 ∈ {0} ↦ (sgn‘𝐾)))
51	39, 44, 50	3eqtr4d 2782	1 ⊢ (𝐾 ∈ ℝ → (𝑇‘⟨“𝐾”⟩) = ⟨“(sgn‘𝐾)”⟩)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ifcif 4528 {csn 4628 {cpr 4630 {ctp 4632 ⟨cop 4634 ↦ cmpt 5231 ‘cfv 6543 (class class class)co 7411 ∈ cmpo 7413 ℝcr 11111 0cc0 11112 1c1 11113 ℝ^*cxr 11249 − cmin 11446 -cneg 11447 ℤcz 12560 ...cfz 13486 ..^cfzo 13629 ♯chash 14292 Word cword 14466 ⟨“cs1 14547 sgncsgn 15035 Σcsu 15634 ndxcnx 17128 Basecbs 17146 +_gcplusg 17199 Σ_g cgsu 17388 Mndcmnd 18627

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 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

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 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-supp 8149 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-oi 9507 df-card 9936 df-pnf 11252 df-mnf 11253 df-xr 11254 df-ltxr 11255 df-le 11256 df-sub 11448 df-neg 11449 df-nn 12215 df-2 12277 df-n0 12475 df-z 12561 df-uz 12825 df-fz 13487 df-fzo 13630 df-seq 13969 df-hash 14293 df-word 14467 df-s1 14548 df-sgn 15036 df-struct 17082 df-slot 17117 df-ndx 17129 df-base 17147 df-plusg 17212 df-0g 17389 df-gsum 17390 df-mgm 18563 df-sgrp 18612 df-mnd 18628 df-mulg 18953 df-cntz 19183

This theorem is referenced by: signsvtn0 33650 signstfvneq0 33652

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