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Theorem israg 27948

Description: Property for 3 points A, B, C to form a right angle. Definition 8.1 of [Schwabhauser] p. 57. (Contributed by Thierry Arnoux, 25-Aug-2019.)

**Hypotheses**
Ref	Expression
israg.p	⊢ 𝑃 = (Base‘𝐺)
israg.d	⊢ − = (dist‘𝐺)
israg.i	⊢ 𝐼 = (Itv‘𝐺)
israg.l	⊢ 𝐿 = (LineG‘𝐺)
israg.s	⊢ 𝑆 = (pInvG‘𝐺)
israg.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
israg.a	⊢ (𝜑 → 𝐴 ∈ 𝑃)
israg.b	⊢ (𝜑 → 𝐵 ∈ 𝑃)
israg.c	⊢ (𝜑 → 𝐶 ∈ 𝑃)

**Assertion**
Ref	Expression
israg	⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩ ∈ (∟G‘𝐺) ↔ (𝐴 − 𝐶) = (𝐴 − ((𝑆‘𝐵)‘𝐶))))

Proof of Theorem israg Dummy variables 𝑔 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		israg.a	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑃)
2		israg.b	. . . 4 ⊢ (𝜑 → 𝐵 ∈ 𝑃)
3		israg.c	. . . 4 ⊢ (𝜑 → 𝐶 ∈ 𝑃)
4	1, 2, 3	s3cld 14823	. . 3 ⊢ (𝜑 → ⟨“𝐴𝐵𝐶”⟩ ∈ Word 𝑃)
5		fveqeq2 6901	. . . . 5 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → ((♯‘𝑤) = 3 ↔ (♯‘⟨“𝐴𝐵𝐶”⟩) = 3))
6		fveq1 6891	. . . . . . 7 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → (𝑤‘0) = (⟨“𝐴𝐵𝐶”⟩‘0))
7		fveq1 6891	. . . . . . 7 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → (𝑤‘2) = (⟨“𝐴𝐵𝐶”⟩‘2))
8	6, 7	oveq12d 7427	. . . . . 6 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → ((𝑤‘0) − (𝑤‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)))
9		fveq1 6891	. . . . . . . . 9 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → (𝑤‘1) = (⟨“𝐴𝐵𝐶”⟩‘1))
10	9	fveq2d 6896	. . . . . . . 8 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → (𝑆‘(𝑤‘1)) = (𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1)))
11	10, 7	fveq12d 6899	. . . . . . 7 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → ((𝑆‘(𝑤‘1))‘(𝑤‘2)) = ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2)))
12	6, 11	oveq12d 7427	. . . . . 6 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))
13	8, 12	eqeq12d 2749	. . . . 5 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → (((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))) ↔ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2)))))
14	5, 13	anbi12d 632	. . . 4 ⊢ (𝑤 = ⟨“𝐴𝐵𝐶”⟩ → (((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2)))) ↔ ((♯‘⟨“𝐴𝐵𝐶”⟩) = 3 ∧ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))))
15	14	elrab3 3685	. . 3 ⊢ (⟨“𝐴𝐵𝐶”⟩ ∈ Word 𝑃 → (⟨“𝐴𝐵𝐶”⟩ ∈ {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))} ↔ ((♯‘⟨“𝐴𝐵𝐶”⟩) = 3 ∧ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))))
16	4, 15	syl 17	. 2 ⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩ ∈ {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))} ↔ ((♯‘⟨“𝐴𝐵𝐶”⟩) = 3 ∧ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))))
17		df-rag 27945	. . . 4 ⊢ ∟G = (𝑔 ∈ V ↦ {𝑤 ∈ Word (Base‘𝑔) ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0)(dist‘𝑔)(𝑤‘2)) = ((𝑤‘0)(dist‘𝑔)(((pInvG‘𝑔)‘(𝑤‘1))‘(𝑤‘2))))})
18		simpr 486	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → 𝑔 = 𝐺)
19	18	fveq2d 6896	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (Base‘𝑔) = (Base‘𝐺))
20		israg.p	. . . . . . 7 ⊢ 𝑃 = (Base‘𝐺)
21	19, 20	eqtr4di 2791	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (Base‘𝑔) = 𝑃)
22		wrdeq 14486	. . . . . 6 ⊢ ((Base‘𝑔) = 𝑃 → Word (Base‘𝑔) = Word 𝑃)
23	21, 22	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → Word (Base‘𝑔) = Word 𝑃)
24	18	fveq2d 6896	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (dist‘𝑔) = (dist‘𝐺))
25		israg.d	. . . . . . . . 9 ⊢ − = (dist‘𝐺)
26	24, 25	eqtr4di 2791	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (dist‘𝑔) = − )
27	26	oveqd 7426	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → ((𝑤‘0)(dist‘𝑔)(𝑤‘2)) = ((𝑤‘0) − (𝑤‘2)))
28		eqidd 2734	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (𝑤‘0) = (𝑤‘0))
29	18	fveq2d 6896	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (pInvG‘𝑔) = (pInvG‘𝐺))
30		israg.s	. . . . . . . . . . 11 ⊢ 𝑆 = (pInvG‘𝐺)
31	29, 30	eqtr4di 2791	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (pInvG‘𝑔) = 𝑆)
32	31	fveq1d 6894	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → ((pInvG‘𝑔)‘(𝑤‘1)) = (𝑆‘(𝑤‘1)))
33	32	fveq1d 6894	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (((pInvG‘𝑔)‘(𝑤‘1))‘(𝑤‘2)) = ((𝑆‘(𝑤‘1))‘(𝑤‘2)))
34	26, 28, 33	oveq123d 7430	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → ((𝑤‘0)(dist‘𝑔)(((pInvG‘𝑔)‘(𝑤‘1))‘(𝑤‘2))) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))
35	27, 34	eqeq12d 2749	. . . . . 6 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (((𝑤‘0)(dist‘𝑔)(𝑤‘2)) = ((𝑤‘0)(dist‘𝑔)(((pInvG‘𝑔)‘(𝑤‘1))‘(𝑤‘2))) ↔ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2)))))
36	35	anbi2d 630	. . . . 5 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → (((♯‘𝑤) = 3 ∧ ((𝑤‘0)(dist‘𝑔)(𝑤‘2)) = ((𝑤‘0)(dist‘𝑔)(((pInvG‘𝑔)‘(𝑤‘1))‘(𝑤‘2)))) ↔ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))))
37	23, 36	rabeqbidv 3450	. . . 4 ⊢ ((𝜑 ∧ 𝑔 = 𝐺) → {𝑤 ∈ Word (Base‘𝑔) ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0)(dist‘𝑔)(𝑤‘2)) = ((𝑤‘0)(dist‘𝑔)(((pInvG‘𝑔)‘(𝑤‘1))‘(𝑤‘2))))} = {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))})
38		israg.g	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
39	38	elexd 3495	. . . 4 ⊢ (𝜑 → 𝐺 ∈ V)
40	20	fvexi 6906	. . . . . . 7 ⊢ 𝑃 ∈ V
41	40	wrdexi 14476	. . . . . 6 ⊢ Word 𝑃 ∈ V
42	41	rabex 5333	. . . . 5 ⊢ {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))} ∈ V
43	42	a1i 11	. . . 4 ⊢ (𝜑 → {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))} ∈ V)
44	17, 37, 39, 43	fvmptd2 7007	. . 3 ⊢ (𝜑 → (∟G‘𝐺) = {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))})
45	44	eleq2d 2820	. 2 ⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩ ∈ (∟G‘𝐺) ↔ ⟨“𝐴𝐵𝐶”⟩ ∈ {𝑤 ∈ Word 𝑃 ∣ ((♯‘𝑤) = 3 ∧ ((𝑤‘0) − (𝑤‘2)) = ((𝑤‘0) − ((𝑆‘(𝑤‘1))‘(𝑤‘2))))}))
46		s3fv0 14842	. . . . . . 7 ⊢ (𝐴 ∈ 𝑃 → (⟨“𝐴𝐵𝐶”⟩‘0) = 𝐴)
47	1, 46	syl 17	. . . . . 6 ⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩‘0) = 𝐴)
48	47	eqcomd 2739	. . . . 5 ⊢ (𝜑 → 𝐴 = (⟨“𝐴𝐵𝐶”⟩‘0))
49		s3fv2 14844	. . . . . . 7 ⊢ (𝐶 ∈ 𝑃 → (⟨“𝐴𝐵𝐶”⟩‘2) = 𝐶)
50	3, 49	syl 17	. . . . . 6 ⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩‘2) = 𝐶)
51	50	eqcomd 2739	. . . . 5 ⊢ (𝜑 → 𝐶 = (⟨“𝐴𝐵𝐶”⟩‘2))
52	48, 51	oveq12d 7427	. . . 4 ⊢ (𝜑 → (𝐴 − 𝐶) = ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)))
53		s3fv1 14843	. . . . . . . . 9 ⊢ (𝐵 ∈ 𝑃 → (⟨“𝐴𝐵𝐶”⟩‘1) = 𝐵)
54	2, 53	syl 17	. . . . . . . 8 ⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩‘1) = 𝐵)
55	54	eqcomd 2739	. . . . . . 7 ⊢ (𝜑 → 𝐵 = (⟨“𝐴𝐵𝐶”⟩‘1))
56	55	fveq2d 6896	. . . . . 6 ⊢ (𝜑 → (𝑆‘𝐵) = (𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1)))
57	56, 51	fveq12d 6899	. . . . 5 ⊢ (𝜑 → ((𝑆‘𝐵)‘𝐶) = ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2)))
58	48, 57	oveq12d 7427	. . . 4 ⊢ (𝜑 → (𝐴 − ((𝑆‘𝐵)‘𝐶)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))
59	52, 58	eqeq12d 2749	. . 3 ⊢ (𝜑 → ((𝐴 − 𝐶) = (𝐴 − ((𝑆‘𝐵)‘𝐶)) ↔ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2)))))
60		s3len 14845	. . . . 5 ⊢ (♯‘⟨“𝐴𝐵𝐶”⟩) = 3
61	60	a1i 11	. . . 4 ⊢ (𝜑 → (♯‘⟨“𝐴𝐵𝐶”⟩) = 3)
62	61	biantrurd 534	. . 3 ⊢ (𝜑 → (((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))) ↔ ((♯‘⟨“𝐴𝐵𝐶”⟩) = 3 ∧ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))))
63	59, 62	bitrd 279	. 2 ⊢ (𝜑 → ((𝐴 − 𝐶) = (𝐴 − ((𝑆‘𝐵)‘𝐶)) ↔ ((♯‘⟨“𝐴𝐵𝐶”⟩) = 3 ∧ ((⟨“𝐴𝐵𝐶”⟩‘0) − (⟨“𝐴𝐵𝐶”⟩‘2)) = ((⟨“𝐴𝐵𝐶”⟩‘0) − ((𝑆‘(⟨“𝐴𝐵𝐶”⟩‘1))‘(⟨“𝐴𝐵𝐶”⟩‘2))))))
64	16, 45, 63	3bitr4d 311	1 ⊢ (𝜑 → (⟨“𝐴𝐵𝐶”⟩ ∈ (∟G‘𝐺) ↔ (𝐴 − 𝐶) = (𝐴 − ((𝑆‘𝐵)‘𝐶))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 {crab 3433 Vcvv 3475 ‘cfv 6544 (class class class)co 7409 0cc0 11110 1c1 11111 2c2 12267 3c3 12268 ♯chash 14290 Word cword 14464 ⟨“cs3 14793 Basecbs 17144 distcds 17206 TarskiGcstrkg 27678 Itvcitv 27684 LineGclng 27685 pInvGcmir 27903 ∟Gcrag 27944

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-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-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-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-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 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-3 12276 df-n0 12473 df-z 12559 df-uz 12823 df-fz 13485 df-fzo 13628 df-hash 14291 df-word 14465 df-concat 14521 df-s1 14546 df-s2 14799 df-s3 14800 df-rag 27945

This theorem is referenced by: ragcom 27949 ragcol 27950 ragmir 27951 mirrag 27952 ragtrivb 27953 ragflat2 27954 ragflat 27955 ragcgr 27958 footexALT 27969 footexlem1 27970 footexlem2 27971 colperpexlem1 27981 colperpexlem3 27983 mideulem2 27985 opphllem 27986 lmiisolem 28047 hypcgrlem1 28050 hypcgrlem2 28051 trgcopyeulem 28056

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