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Theorem rrnmet 37163

Description: Euclidean space is a metric space. (Contributed by Jeff Madsen, 2-Sep-2009.) (Proof shortened by Mario Carneiro, 5-Jun-2014.)

**Hypothesis**
Ref	Expression
rrnval.1	⊢ 𝑋 = (ℝ ↑_m 𝐼)

**Assertion**
Ref	Expression
rrnmet	⊢ (𝐼 ∈ Fin → (ℝⁿ‘𝐼) ∈ (Met‘𝑋))

Proof of Theorem rrnmet Dummy variables 𝑘 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl 482	. . . . . . 7 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝐼 ∈ Fin)
2		simprl 768	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥 ∈ 𝑋)
3		rrnval.1	. . . . . . . . . . . 12 ⊢ 𝑋 = (ℝ ↑_m 𝐼)
4	2, 3	eleqtrdi 2842	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥 ∈ (ℝ ↑_m 𝐼))
5		elmapi 8849	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (ℝ ↑_m 𝐼) → 𝑥:𝐼⟶ℝ)
6	4, 5	syl 17	. . . . . . . . . 10 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥:𝐼⟶ℝ)
7	6	ffvelcdmda 7086	. . . . . . . . 9 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℝ)
8		simprr 770	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦 ∈ 𝑋)
9	8, 3	eleqtrdi 2842	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦 ∈ (ℝ ↑_m 𝐼))
10		elmapi 8849	. . . . . . . . . . 11 ⊢ (𝑦 ∈ (ℝ ↑_m 𝐼) → 𝑦:𝐼⟶ℝ)
11	9, 10	syl 17	. . . . . . . . . 10 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦:𝐼⟶ℝ)
12	11	ffvelcdmda 7086	. . . . . . . . 9 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℝ)
13	7, 12	resubcld 11649	. . . . . . . 8 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((𝑥‘𝑘) − (𝑦‘𝑘)) ∈ ℝ)
14	13	resqcld 14097	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ)
15	1, 14	fsumrecl 15687	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ)
16	13	sqge0d 14109	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → 0 ≤ (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
17	1, 14, 16	fsumge0 15748	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 0 ≤ Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
18	15, 17	resqrtcld 15371	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ∈ ℝ)
19	18	ralrimivva 3199	. . . 4 ⊢ (𝐼 ∈ Fin → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ∈ ℝ)
20		eqid 2731	. . . . 5 ⊢ (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))) = (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
21	20	fmpo 8058	. . . 4 ⊢ (∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ∈ ℝ ↔ (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))):(𝑋 × 𝑋)⟶ℝ)
22	19, 21	sylib 217	. . 3 ⊢ (𝐼 ∈ Fin → (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))):(𝑋 × 𝑋)⟶ℝ)
23	3	rrnval 37161	. . . 4 ⊢ (𝐼 ∈ Fin → (ℝⁿ‘𝐼) = (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))))
24	23	feq1d 6702	. . 3 ⊢ (𝐼 ∈ Fin → ((ℝⁿ‘𝐼):(𝑋 × 𝑋)⟶ℝ ↔ (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))):(𝑋 × 𝑋)⟶ℝ))
25	22, 24	mpbird 257	. 2 ⊢ (𝐼 ∈ Fin → (ℝⁿ‘𝐼):(𝑋 × 𝑋)⟶ℝ)
26		sqrt00 15217	. . . . . . . 8 ⊢ ((Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ ∧ 0 ≤ Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) → ((√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
27	15, 17, 26	syl2anc 583	. . . . . . 7 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
28	1, 14, 16	fsum00 15751	. . . . . . 7 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ∀𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
29	27, 28	bitrd 279	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ ∀𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
30	13	recnd 11249	. . . . . . . . 9 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((𝑥‘𝑘) − (𝑦‘𝑘)) ∈ ℂ)
31		sqeq0 14092	. . . . . . . . 9 ⊢ (((𝑥‘𝑘) − (𝑦‘𝑘)) ∈ ℂ → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ((𝑥‘𝑘) − (𝑦‘𝑘)) = 0))
32	30, 31	syl 17	. . . . . . . 8 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ((𝑥‘𝑘) − (𝑦‘𝑘)) = 0))
33	7	recnd 11249	. . . . . . . . 9 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℂ)
34	12	recnd 11249	. . . . . . . . 9 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℂ)
35	33, 34	subeq0ad 11588	. . . . . . . 8 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑦‘𝑘)) = 0 ↔ (𝑥‘𝑘) = (𝑦‘𝑘)))
36	32, 35	bitrd 279	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ (𝑥‘𝑘) = (𝑦‘𝑘)))
37	36	ralbidva 3174	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (∀𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
38	29, 37	bitrd 279	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
39	3	rrnmval 37162	. . . . . . 7 ⊢ ((𝐼 ∈ Fin ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥(ℝⁿ‘𝐼)𝑦) = (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
40	39	3expb 1119	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥(ℝⁿ‘𝐼)𝑦) = (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
41	40	eqeq1d 2733	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥(ℝⁿ‘𝐼)𝑦) = 0 ↔ (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0))
42	6	ffnd 6718	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥 Fn 𝐼)
43	11	ffnd 6718	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦 Fn 𝐼)
44		eqfnfv 7032	. . . . . 6 ⊢ ((𝑥 Fn 𝐼 ∧ 𝑦 Fn 𝐼) → (𝑥 = 𝑦 ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
45	42, 43, 44	syl2anc 583	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 = 𝑦 ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
46	38, 41, 45	3bitr4d 311	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥(ℝⁿ‘𝐼)𝑦) = 0 ↔ 𝑥 = 𝑦))
47		simpll 764	. . . . . . . 8 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → 𝐼 ∈ Fin)
48	7	adantlr 712	. . . . . . . . 9 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℝ)
49		simpr 484	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → 𝑧 ∈ 𝑋)
50	49, 3	eleqtrdi 2842	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → 𝑧 ∈ (ℝ ↑_m 𝐼))
51		elmapi 8849	. . . . . . . . . . 11 ⊢ (𝑧 ∈ (ℝ ↑_m 𝐼) → 𝑧:𝐼⟶ℝ)
52	50, 51	syl 17	. . . . . . . . . 10 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → 𝑧:𝐼⟶ℝ)
53	52	ffvelcdmda 7086	. . . . . . . . 9 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑧‘𝑘) ∈ ℝ)
54	48, 53	resubcld 11649	. . . . . . . 8 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → ((𝑥‘𝑘) − (𝑧‘𝑘)) ∈ ℝ)
55	12	adantlr 712	. . . . . . . . 9 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℝ)
56	53, 55	resubcld 11649	. . . . . . . 8 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → ((𝑧‘𝑘) − (𝑦‘𝑘)) ∈ ℝ)
57	47, 54, 56	trirn 25248	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ 𝐼 ((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2)) ≤ ((√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑧‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
58	33	adantlr 712	. . . . . . . . . . 11 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℂ)
59	53	recnd 11249	. . . . . . . . . . 11 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑧‘𝑘) ∈ ℂ)
60	34	adantlr 712	. . . . . . . . . . 11 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℂ)
61	58, 59, 60	npncand 11602	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘))) = ((𝑥‘𝑘) − (𝑦‘𝑘)))
62	61	oveq1d 7427	. . . . . . . . 9 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → ((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2) = (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
63	62	sumeq2dv 15656	. . . . . . . 8 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → Σ𝑘 ∈ 𝐼 ((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2) = Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
64	63	fveq2d 6895	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ 𝐼 ((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2)) = (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
65		sqsubswap 14089	. . . . . . . . . . 11 ⊢ (((𝑥‘𝑘) ∈ ℂ ∧ (𝑧‘𝑘) ∈ ℂ) → (((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = (((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
66	58, 59, 65	syl2anc 583	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = (((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
67	66	sumeq2dv 15656	. . . . . . . . 9 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
68	67	fveq2d 6895	. . . . . . . 8 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑧‘𝑘))↑2)) = (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
69	68	oveq1d 7427	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → ((√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑧‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))) = ((√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
70	57, 64, 69	3brtr3d 5179	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ≤ ((√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
71	40	adantr 480	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (𝑥(ℝⁿ‘𝐼)𝑦) = (√‘Σ𝑘 ∈ 𝐼 (((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
72	3	rrnmval 37162	. . . . . . . . . 10 ⊢ ((𝐼 ∈ Fin ∧ 𝑧 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋) → (𝑧(ℝⁿ‘𝐼)𝑥) = (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
73	72	3adant3r 1180	. . . . . . . . 9 ⊢ ((𝐼 ∈ Fin ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧(ℝⁿ‘𝐼)𝑥) = (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
74	3	rrnmval 37162	. . . . . . . . . 10 ⊢ ((𝐼 ∈ Fin ∧ 𝑧 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑧(ℝⁿ‘𝐼)𝑦) = (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2)))
75	74	3adant3l 1179	. . . . . . . . 9 ⊢ ((𝐼 ∈ Fin ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧(ℝⁿ‘𝐼)𝑦) = (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2)))
76	73, 75	oveq12d 7430	. . . . . . . 8 ⊢ ((𝐼 ∈ Fin ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦)) = ((√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
77	76	3expa 1117	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑧 ∈ 𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦)) = ((√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
78	77	an32s 649	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦)) = ((√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ 𝐼 (((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
79	70, 71, 78	3brtr4d 5180	. . . . 5 ⊢ (((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (𝑥(ℝⁿ‘𝐼)𝑦) ≤ ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦)))
80	79	ralrimiva 3145	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ∀𝑧 ∈ 𝑋 (𝑥(ℝⁿ‘𝐼)𝑦) ≤ ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦)))
81	46, 80	jca 511	. . 3 ⊢ ((𝐼 ∈ Fin ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝑥(ℝⁿ‘𝐼)𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥(ℝⁿ‘𝐼)𝑦) ≤ ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦))))
82	81	ralrimivva 3199	. 2 ⊢ (𝐼 ∈ Fin → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑥(ℝⁿ‘𝐼)𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥(ℝⁿ‘𝐼)𝑦) ≤ ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦))))
83		ovex 7445	. . . 4 ⊢ (ℝ ↑_m 𝐼) ∈ V
84	3, 83	eqeltri 2828	. . 3 ⊢ 𝑋 ∈ V
85		ismet 24149	. . 3 ⊢ (𝑋 ∈ V → ((ℝⁿ‘𝐼) ∈ (Met‘𝑋) ↔ ((ℝⁿ‘𝐼):(𝑋 × 𝑋)⟶ℝ ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑥(ℝⁿ‘𝐼)𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥(ℝⁿ‘𝐼)𝑦) ≤ ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦))))))
86	84, 85	ax-mp 5	. 2 ⊢ ((ℝⁿ‘𝐼) ∈ (Met‘𝑋) ↔ ((ℝⁿ‘𝐼):(𝑋 × 𝑋)⟶ℝ ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑥(ℝⁿ‘𝐼)𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥(ℝⁿ‘𝐼)𝑦) ≤ ((𝑧(ℝⁿ‘𝐼)𝑥) + (𝑧(ℝⁿ‘𝐼)𝑦)))))
87	25, 82, 86	sylanbrc 582	1 ⊢ (𝐼 ∈ Fin → (ℝⁿ‘𝐼) ∈ (Met‘𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 ∀wral 3060 Vcvv 3473 class class class wbr 5148 × cxp 5674 Fn wfn 6538 ⟶wf 6539 ‘cfv 6543 (class class class)co 7412 ∈ cmpo 7414 ↑_m cmap 8826 Fincfn 8945 ℂcc 11114 ℝcr 11115 0cc0 11116 + caddc 11119 ≤ cle 11256 − cmin 11451 2c2 12274 ↑cexp 14034 √csqrt 15187 Σcsu 15639 Metcmet 21219 ℝⁿcrrn 37159

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-inf2 9642 ax-cnex 11172 ax-resscn 11173 ax-1cn 11174 ax-icn 11175 ax-addcl 11176 ax-addrcl 11177 ax-mulcl 11178 ax-mulrcl 11179 ax-mulcom 11180 ax-addass 11181 ax-mulass 11182 ax-distr 11183 ax-i2m1 11184 ax-1ne0 11185 ax-1rid 11186 ax-rnegex 11187 ax-rrecex 11188 ax-cnre 11189 ax-pre-lttri 11190 ax-pre-lttrn 11191 ax-pre-ltadd 11192 ax-pre-mulgt0 11193 ax-pre-sup 11194

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 df-v 3475 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-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 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8272 df-wrecs 8303 df-recs 8377 df-rdg 8416 df-1o 8472 df-er 8709 df-map 8828 df-en 8946 df-dom 8947 df-sdom 8948 df-fin 8949 df-sup 9443 df-oi 9511 df-card 9940 df-pnf 11257 df-mnf 11258 df-xr 11259 df-ltxr 11260 df-le 11261 df-sub 11453 df-neg 11454 df-div 11879 df-nn 12220 df-2 12282 df-3 12283 df-4 12284 df-n0 12480 df-z 12566 df-uz 12830 df-rp 12982 df-ico 13337 df-fz 13492 df-fzo 13635 df-seq 13974 df-exp 14035 df-hash 14298 df-cj 15053 df-re 15054 df-im 15055 df-sqrt 15189 df-abs 15190 df-clim 15439 df-sum 15640 df-met 21227 df-rrn 37160

This theorem is referenced by: rrncmslem 37166 rrncms 37167 rrnequiv 37169 rrntotbnd 37170 rrnheibor 37171 ismrer1 37172 reheibor 37173

W3C validator