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Theorem rrxmet 25455

Description: Euclidean space is a metric space. (Contributed by Jeff Madsen, 2-Sep-2009.) (Proof shortened by Mario Carneiro, 5-Jun-2014.) (Revised by Thierry Arnoux, 30-Jun-2019.)

**Hypotheses**
Ref	Expression
rrxmval.1	⊢ 𝑋 = {ℎ ∈ (ℝ ↑_m 𝐼) ∣ ℎ finSupp 0}
rrxmval.d	⊢ 𝐷 = (dist‘(ℝ^‘𝐼))

**Assertion**
Ref	Expression
rrxmet	⊢ (𝐼 ∈ 𝑉 → 𝐷 ∈ (Met‘𝑋))

Distinct variable groups: ℎ,𝐼 ℎ,𝑉 Allowed substitution hints: 𝐷(ℎ) 𝑋(ℎ)

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

Step	Hyp	Ref	Expression
1		rrxmval.1	. . . . . . . . 9 ⊢ 𝑋 = {ℎ ∈ (ℝ ↑_m 𝐼) ∣ ℎ finSupp 0}
2		simprl 771	. . . . . . . . 9 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥 ∈ 𝑋)
3	1, 2	rrxfsupp 25449	. . . . . . . 8 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 supp 0) ∈ Fin)
4		simprr 773	. . . . . . . . 9 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦 ∈ 𝑋)
5	1, 4	rrxfsupp 25449	. . . . . . . 8 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑦 supp 0) ∈ Fin)
6		unfi 9209	. . . . . . . 8 ⊢ (((𝑥 supp 0) ∈ Fin ∧ (𝑦 supp 0) ∈ Fin) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ∈ Fin)
7	3, 5, 6	syl2anc 584	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ∈ Fin)
8	1, 2	rrxsuppss 25450	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 supp 0) ⊆ 𝐼)
9	1, 4	rrxsuppss 25450	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑦 supp 0) ⊆ 𝐼)
10	8, 9	unssd 4201	. . . . . . . . 9 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ⊆ 𝐼)
11	10	sselda 3994	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))) → 𝑘 ∈ 𝐼)
12	1, 2	rrxf 25448	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥:𝐼⟶ℝ)
13	12	ffvelcdmda 7103	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℝ)
14	1, 4	rrxf 25448	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦:𝐼⟶ℝ)
15	14	ffvelcdmda 7103	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℝ)
16	13, 15	resubcld 11688	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((𝑥‘𝑘) − (𝑦‘𝑘)) ∈ ℝ)
17	16	resqcld 14161	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ)
18	11, 17	syldan 591	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))) → (((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ)
19	7, 18	fsumrecl 15766	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ)
20	16	sqge0d 14173	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → 0 ≤ (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
21	11, 20	syldan 591	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))) → 0 ≤ (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
22	7, 18, 21	fsumge0 15827	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 0 ≤ Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
23	19, 22	resqrtcld 15452	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ∈ ℝ)
24	23	ralrimivva 3199	. . . 4 ⊢ (𝐼 ∈ 𝑉 → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ∈ ℝ)
25		eqid 2734	. . . . 5 ⊢ (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))) = (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
26	25	fmpo 8091	. . . 4 ⊢ (∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ∈ ℝ ↔ (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))):(𝑋 × 𝑋)⟶ℝ)
27	24, 26	sylib 218	. . 3 ⊢ (𝐼 ∈ 𝑉 → (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))):(𝑋 × 𝑋)⟶ℝ)
28		rrxmval.d	. . . . 5 ⊢ 𝐷 = (dist‘(ℝ^‘𝐼))
29	1, 28	rrxmfval 25453	. . . 4 ⊢ (𝐼 ∈ 𝑉 → 𝐷 = (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))))
30	29	feq1d 6720	. . 3 ⊢ (𝐼 ∈ 𝑉 → (𝐷:(𝑋 × 𝑋)⟶ℝ ↔ (𝑥 ∈ 𝑋, 𝑦 ∈ 𝑋 ↦ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))):(𝑋 × 𝑋)⟶ℝ))
31	27, 30	mpbird 257	. 2 ⊢ (𝐼 ∈ 𝑉 → 𝐷:(𝑋 × 𝑋)⟶ℝ)
32		sqrt00 15298	. . . . . . 7 ⊢ ((Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) ∈ ℝ ∧ 0 ≤ Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) → ((√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
33	19, 22, 32	syl2anc 584	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
34	7, 18, 21	fsum00 15830	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ∀𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0))
35	16	recnd 11286	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((𝑥‘𝑘) − (𝑦‘𝑘)) ∈ ℂ)
36		sqeq0 14156	. . . . . . . . . 10 ⊢ (((𝑥‘𝑘) − (𝑦‘𝑘)) ∈ ℂ → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ((𝑥‘𝑘) − (𝑦‘𝑘)) = 0))
37	35, 36	syl 17	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ((𝑥‘𝑘) − (𝑦‘𝑘)) = 0))
38	13	recnd 11286	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℂ)
39	15	recnd 11286	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℂ)
40	38, 39	subeq0ad 11627	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑦‘𝑘)) = 0 ↔ (𝑥‘𝑘) = (𝑦‘𝑘)))
41	37, 40	bitrd 279	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ 𝐼) → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ (𝑥‘𝑘) = (𝑦‘𝑘)))
42	11, 41	syldan 591	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))) → ((((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ (𝑥‘𝑘) = (𝑦‘𝑘)))
43	42	ralbidva 3173	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (∀𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = 0 ↔ ∀𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(𝑥‘𝑘) = (𝑦‘𝑘)))
44	33, 34, 43	3bitrd 305	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0 ↔ ∀𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(𝑥‘𝑘) = (𝑦‘𝑘)))
45	1, 28	rrxmval 25452	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝐷𝑦) = (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
46	45	3expb 1119	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥𝐷𝑦) = (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
47	46	eqeq1d 2736	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥𝐷𝑦) = 0 ↔ (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = 0))
48	12	ffnd 6737	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥 Fn 𝐼)
49	14	ffnd 6737	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦 Fn 𝐼)
50		eqfnfv 7050	. . . . . . 7 ⊢ ((𝑥 Fn 𝐼 ∧ 𝑦 Fn 𝐼) → (𝑥 = 𝑦 ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
51	48, 49, 50	syl2anc 584	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 = 𝑦 ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
52		ssun1 4187	. . . . . . . . . . 11 ⊢ (𝑥 supp 0) ⊆ ((𝑥 supp 0) ∪ (𝑦 supp 0))
53	52	a1i 11	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 supp 0) ⊆ ((𝑥 supp 0) ∪ (𝑦 supp 0)))
54		simpl 482	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝐼 ∈ 𝑉)
55		0red 11261	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 0 ∈ ℝ)
56	12, 53, 54, 55	suppssr 8218	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ (𝐼 ∖ ((𝑥 supp 0) ∪ (𝑦 supp 0)))) → (𝑥‘𝑘) = 0)
57		ssun2 4188	. . . . . . . . . . 11 ⊢ (𝑦 supp 0) ⊆ ((𝑥 supp 0) ∪ (𝑦 supp 0))
58	57	a1i 11	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑦 supp 0) ⊆ ((𝑥 supp 0) ∪ (𝑦 supp 0)))
59	14, 58, 54, 55	suppssr 8218	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ (𝐼 ∖ ((𝑥 supp 0) ∪ (𝑦 supp 0)))) → (𝑦‘𝑘) = 0)
60	56, 59	eqtr4d 2777	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑘 ∈ (𝐼 ∖ ((𝑥 supp 0) ∪ (𝑦 supp 0)))) → (𝑥‘𝑘) = (𝑦‘𝑘))
61	60	ralrimiva 3143	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ∀𝑘 ∈ (𝐼 ∖ ((𝑥 supp 0) ∪ (𝑦 supp 0)))(𝑥‘𝑘) = (𝑦‘𝑘))
62	10, 61	raldifeq 4499	. . . . . 6 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (∀𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(𝑥‘𝑘) = (𝑦‘𝑘) ↔ ∀𝑘 ∈ 𝐼 (𝑥‘𝑘) = (𝑦‘𝑘)))
63	51, 62	bitr4d 282	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 = 𝑦 ↔ ∀𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(𝑥‘𝑘) = (𝑦‘𝑘)))
64	44, 47, 63	3bitr4d 311	. . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦))
65	7	3adant2 1130	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ∈ Fin)
66		simp2 1136	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑧 ∈ 𝑋)
67	1, 66	rrxfsupp 25449	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧 supp 0) ∈ Fin)
68		unfi 9209	. . . . . . . . . . 11 ⊢ ((((𝑥 supp 0) ∪ (𝑦 supp 0)) ∈ Fin ∧ (𝑧 supp 0) ∈ Fin) → (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)) ∈ Fin)
69	65, 67, 68	syl2anc 584	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)) ∈ Fin)
70	69	3expa 1117	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)) ∈ Fin)
71	70	an32s 652	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)) ∈ Fin)
72	10	adantr 480	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ⊆ 𝐼)
73		simpr 484	. . . . . . . . . . . 12 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → 𝑧 ∈ 𝑋)
74	1, 73	rrxsuppss 25450	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (𝑧 supp 0) ⊆ 𝐼)
75	72, 74	unssd 4201	. . . . . . . . . 10 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)) ⊆ 𝐼)
76	75	sselda 3994	. . . . . . . . 9 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))) → 𝑘 ∈ 𝐼)
77	13	adantlr 715	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℝ)
78	1, 73	rrxf 25448	. . . . . . . . . . 11 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → 𝑧:𝐼⟶ℝ)
79	78	ffvelcdmda 7103	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑧‘𝑘) ∈ ℝ)
80	77, 79	resubcld 11688	. . . . . . . . 9 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → ((𝑥‘𝑘) − (𝑧‘𝑘)) ∈ ℝ)
81	76, 80	syldan 591	. . . . . . . 8 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))) → ((𝑥‘𝑘) − (𝑧‘𝑘)) ∈ ℝ)
82	15	adantlr 715	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℝ)
83	79, 82	resubcld 11688	. . . . . . . . 9 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → ((𝑧‘𝑘) − (𝑦‘𝑘)) ∈ ℝ)
84	76, 83	syldan 591	. . . . . . . 8 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))) → ((𝑧‘𝑘) − (𝑦‘𝑘)) ∈ ℝ)
85	71, 81, 84	trirn 25447	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2)) ≤ ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑧‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
86	38	adantlr 715	. . . . . . . . . . . 12 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑥‘𝑘) ∈ ℂ)
87	79	recnd 11286	. . . . . . . . . . . 12 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑧‘𝑘) ∈ ℂ)
88	39	adantlr 715	. . . . . . . . . . . 12 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (𝑦‘𝑘) ∈ ℂ)
89	86, 87, 88	npncand 11641	. . . . . . . . . . 11 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘))) = ((𝑥‘𝑘) − (𝑦‘𝑘)))
90	89	oveq1d 7445	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → ((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2) = (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
91	76, 90	syldan 591	. . . . . . . . 9 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))) → ((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2) = (((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
92	91	sumeq2dv 15734	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2) = Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
93	92	fveq2d 6910	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))((((𝑥‘𝑘) − (𝑧‘𝑘)) + ((𝑧‘𝑘) − (𝑦‘𝑘)))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
94		sqsubswap 14153	. . . . . . . . . . . 12 ⊢ (((𝑥‘𝑘) ∈ ℂ ∧ (𝑧‘𝑘) ∈ ℂ) → (((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = (((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
95	86, 87, 94	syl2anc 584	. . . . . . . . . . 11 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ 𝐼) → (((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = (((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
96	76, 95	syldan 591	. . . . . . . . . 10 ⊢ ((((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) ∧ 𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))) → (((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = (((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
97	96	sumeq2dv 15734	. . . . . . . . 9 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑧‘𝑘))↑2) = Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
98	97	fveq2d 6910	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑧‘𝑘))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
99	98	oveq1d 7445	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑧‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))) = ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
100	85, 93, 99	3brtr3d 5178	. . . . . 6 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) ≤ ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
101	46	adantr 480	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (𝑥𝐷𝑦) = (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
102		simp1 1135	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝐼 ∈ 𝑉)
103	2	3adant2 1130	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑥 ∈ 𝑋)
104	4	3adant2 1130	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → 𝑦 ∈ 𝑋)
105	1, 103	rrxsuppss 25450	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 supp 0) ⊆ 𝐼)
106	1, 104	rrxsuppss 25450	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑦 supp 0) ⊆ 𝐼)
107	105, 106	unssd 4201	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ⊆ 𝐼)
108	1, 66	rrxsuppss 25450	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧 supp 0) ⊆ 𝐼)
109	107, 108	unssd 4201	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)) ⊆ 𝐼)
110		ssun1 4187	. . . . . . . . . . . 12 ⊢ ((𝑥 supp 0) ∪ (𝑦 supp 0)) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))
111	110	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑥 supp 0) ∪ (𝑦 supp 0)) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)))
112	1, 28, 102, 103, 104, 109, 69, 111	rrxmetlem 25454	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2) = Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2))
113	112	fveq2d 6910	. . . . . . . . 9 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
114	113	3expa 1117	. . . . . . . 8 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
115	114	an32s 652	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (√‘Σ𝑘 ∈ ((𝑥 supp 0) ∪ (𝑦 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
116	101, 115	eqtrd 2774	. . . . . 6 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (𝑥𝐷𝑦) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑥‘𝑘) − (𝑦‘𝑘))↑2)))
117	1, 28	rrxmval 25452	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ 𝑥 ∈ 𝑋) → (𝑧𝐷𝑥) = (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑥 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
118	117	3adant3r 1180	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧𝐷𝑥) = (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑥 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
119	1, 28	rrxmval 25452	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑧𝐷𝑦) = (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑦 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2)))
120	119	3adant3l 1179	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧𝐷𝑦) = (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑦 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2)))
121	118, 120	oveq12d 7448	. . . . . . . . 9 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)) = ((√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑥 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑦 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
122		ssun2 4188	. . . . . . . . . . . . . 14 ⊢ (𝑧 supp 0) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))
123	122	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑧 supp 0) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)))
124	52, 110	sstri 4004	. . . . . . . . . . . . . 14 ⊢ (𝑥 supp 0) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))
125	124	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 supp 0) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)))
126	123, 125	unssd 4201	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧 supp 0) ∪ (𝑥 supp 0)) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)))
127	1, 28, 102, 66, 103, 109, 69, 126	rrxmetlem 25454	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑥 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2) = Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2))
128	127	fveq2d 6910	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑥 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)))
129	57, 110	sstri 4004	. . . . . . . . . . . . . 14 ⊢ (𝑦 supp 0) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))
130	129	a1i 11	. . . . . . . . . . . . 13 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑦 supp 0) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)))
131	123, 130	unssd 4201	. . . . . . . . . . . 12 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧 supp 0) ∪ (𝑦 supp 0)) ⊆ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0)))
132	1, 28, 102, 66, 104, 109, 69, 131	rrxmetlem 25454	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑦 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2) = Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))
133	132	fveq2d 6910	. . . . . . . . . 10 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑦 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2)) = (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2)))
134	128, 133	oveq12d 7448	. . . . . . . . 9 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑥 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ ((𝑧 supp 0) ∪ (𝑦 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))) = ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
135	121, 134	eqtrd 2774	. . . . . . . 8 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)) = ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
136	135	3expa 1117	. . . . . . 7 ⊢ (((𝐼 ∈ 𝑉 ∧ 𝑧 ∈ 𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)) = ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
137	136	an32s 652	. . . . . 6 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)) = ((√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑥‘𝑘))↑2)) + (√‘Σ𝑘 ∈ (((𝑥 supp 0) ∪ (𝑦 supp 0)) ∪ (𝑧 supp 0))(((𝑧‘𝑘) − (𝑦‘𝑘))↑2))))
138	100, 116, 137	3brtr4d 5179	. . . . 5 ⊢ (((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑧 ∈ 𝑋) → (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)))
139	138	ralrimiva 3143	. . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → ∀𝑧 ∈ 𝑋 (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)))
140	64, 139	jca 511	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) + (𝑧𝐷𝑦))))
141	140	ralrimivva 3199	. 2 ⊢ (𝐼 ∈ 𝑉 → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) + (𝑧𝐷𝑦))))
142		ovex 7463	. . . 4 ⊢ (ℝ ↑_m 𝐼) ∈ V
143	1, 142	rabex2 5346	. . 3 ⊢ 𝑋 ∈ V
144		ismet 24348	. . 3 ⊢ (𝑋 ∈ V → (𝐷 ∈ (Met‘𝑋) ↔ (𝐷:(𝑋 × 𝑋)⟶ℝ ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) + (𝑧𝐷𝑦))))))
145	143, 144	ax-mp 5	. 2 ⊢ (𝐷 ∈ (Met‘𝑋) ↔ (𝐷:(𝑋 × 𝑋)⟶ℝ ∧ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (((𝑥𝐷𝑦) = 0 ↔ 𝑥 = 𝑦) ∧ ∀𝑧 ∈ 𝑋 (𝑥𝐷𝑦) ≤ ((𝑧𝐷𝑥) + (𝑧𝐷𝑦)))))
146	31, 141, 145	sylanbrc 583	1 ⊢ (𝐼 ∈ 𝑉 → 𝐷 ∈ (Met‘𝑋))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1536 ∈ wcel 2105 ∀wral 3058 {crab 3432 Vcvv 3477 ∖ cdif 3959 ∪ cun 3960 ⊆ wss 3962 class class class wbr 5147 × cxp 5686 Fn wfn 6557 ⟶wf 6558 ‘cfv 6562 (class class class)co 7430 ∈ cmpo 7432 supp csupp 8183 ↑_m cmap 8864 Fincfn 8983 finSupp cfsupp 9398 ℂcc 11150 ℝcr 11151 0cc0 11152 + caddc 11155 ≤ cle 11293 − cmin 11489 2c2 12318 ↑cexp 14098 √csqrt 15268 Σcsu 15718 distcds 17306 Metcmet 21367 ℝ^crrx 25430

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1791 ax-4 1805 ax-5 1907 ax-6 1964 ax-7 2004 ax-8 2107 ax-9 2115 ax-10 2138 ax-11 2154 ax-12 2174 ax-ext 2705 ax-rep 5284 ax-sep 5301 ax-nul 5311 ax-pow 5370 ax-pr 5437 ax-un 7753 ax-inf2 9678 ax-cnex 11208 ax-resscn 11209 ax-1cn 11210 ax-icn 11211 ax-addcl 11212 ax-addrcl 11213 ax-mulcl 11214 ax-mulrcl 11215 ax-mulcom 11216 ax-addass 11217 ax-mulass 11218 ax-distr 11219 ax-i2m1 11220 ax-1ne0 11221 ax-1rid 11222 ax-rnegex 11223 ax-rrecex 11224 ax-cnre 11225 ax-pre-lttri 11226 ax-pre-lttrn 11227 ax-pre-ltadd 11228 ax-pre-mulgt0 11229 ax-pre-sup 11230 ax-addf 11231 ax-mulf 11232

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1539 df-fal 1549 df-ex 1776 df-nf 1780 df-sb 2062 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2889 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3377 df-reu 3378 df-rab 3433 df-v 3479 df-sbc 3791 df-csb 3908 df-dif 3965 df-un 3967 df-in 3969 df-ss 3979 df-pss 3982 df-nul 4339 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-tp 4635 df-op 4637 df-uni 4912 df-int 4951 df-iun 4997 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5582 df-eprel 5588 df-po 5596 df-so 5597 df-fr 5640 df-se 5641 df-we 5642 df-xp 5694 df-rel 5695 df-cnv 5696 df-co 5697 df-dm 5698 df-rn 5699 df-res 5700 df-ima 5701 df-pred 6322 df-ord 6388 df-on 6389 df-lim 6390 df-suc 6391 df-iota 6515 df-fun 6564 df-fn 6565 df-f 6566 df-f1 6567 df-fo 6568 df-f1o 6569 df-fv 6570 df-isom 6571 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-of 7696 df-om 7887 df-1st 8012 df-2nd 8013 df-supp 8184 df-tpos 8249 df-frecs 8304 df-wrecs 8335 df-recs 8409 df-rdg 8448 df-1o 8504 df-er 8743 df-map 8866 df-ixp 8936 df-en 8984 df-dom 8985 df-sdom 8986 df-fin 8987 df-fsupp 9399 df-sup 9479 df-oi 9547 df-card 9976 df-pnf 11294 df-mnf 11295 df-xr 11296 df-ltxr 11297 df-le 11298 df-sub 11491 df-neg 11492 df-div 11918 df-nn 12264 df-2 12326 df-3 12327 df-4 12328 df-5 12329 df-6 12330 df-7 12331 df-8 12332 df-9 12333 df-n0 12524 df-z 12611 df-dec 12731 df-uz 12876 df-rp 13032 df-ico 13389 df-fz 13544 df-fzo 13691 df-seq 14039 df-exp 14099 df-hash 14366 df-cj 15134 df-re 15135 df-im 15136 df-sqrt 15270 df-abs 15271 df-clim 15520 df-sum 15719 df-struct 17180 df-sets 17197 df-slot 17215 df-ndx 17227 df-base 17245 df-ress 17274 df-plusg 17310 df-mulr 17311 df-starv 17312 df-sca 17313 df-vsca 17314 df-ip 17315 df-tset 17316 df-ple 17317 df-ds 17319 df-unif 17320 df-hom 17321 df-cco 17322 df-0g 17487 df-gsum 17488 df-prds 17493 df-pws 17495 df-mgm 18665 df-sgrp 18744 df-mnd 18760 df-mhm 18808 df-grp 18966 df-minusg 18967 df-sbg 18968 df-subg 19153 df-ghm 19243 df-cntz 19347 df-cmn 19814 df-abl 19815 df-mgp 20152 df-rng 20170 df-ur 20199 df-ring 20252 df-cring 20253 df-oppr 20350 df-dvdsr 20373 df-unit 20374 df-invr 20404 df-dvr 20417 df-rhm 20488 df-subrng 20562 df-subrg 20586 df-drng 20747 df-field 20748 df-staf 20856 df-srng 20857 df-lmod 20876 df-lss 20947 df-sra 21189 df-rgmod 21190 df-met 21375 df-cnfld 21382 df-refld 21640 df-dsmm 21769 df-frlm 21784 df-nm 24610 df-tng 24612 df-tcph 25216 df-rrx 25432

This theorem is referenced by: rrxdstprj1 25456 rrxmetfi 25459

W3C validator