Theorem prdsdsf 22172

Description: The product metric is a function into the nonnegative extended reals. In general this means that it is not a metric but rather an *extended* metric (even when all the factors are metrics), but it will be a metric when restricted to regions where it does not take infinite values. (Contributed by Mario Carneiro, 20-Aug-2015.)

Hypotheses

Ref	Expression
prdsdsf.y	⊢ 𝑌 = (𝑆Xs(𝑥 ∈ 𝐼 ↦ 𝑅))
prdsdsf.b	⊢ 𝐵 = (Base‘𝑌)
prdsdsf.v	⊢ 𝑉 = (Base‘𝑅)
prdsdsf.e	⊢ 𝐸 = ((dist‘𝑅) ↾ (𝑉 × 𝑉))
prdsdsf.d	⊢ 𝐷 = (dist‘𝑌)
prdsdsf.s	⊢ (𝜑 → 𝑆 ∈ 𝑊)
prdsdsf.i	⊢ (𝜑 → 𝐼 ∈ 𝑋)
prdsdsf.r	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑅 ∈ 𝑍)
prdsdsf.m	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐸 ∈ (∞Met‘𝑉))

Assertion

Ref	Expression
prdsdsf	⊢ (𝜑 → 𝐷:(𝐵 × 𝐵)⟶(0[,]+∞))

Distinct variable groups:   𝑥,𝐼   𝜑,𝑥

Allowed substitution hints:   𝐵(𝑥)   𝐷(𝑥)   𝑅(𝑥)   𝑆(𝑥)   𝐸(𝑥)   𝑉(𝑥)   𝑊(𝑥)   𝑋(𝑥)   𝑌(𝑥)   𝑍(𝑥)

Proof of Theorem prdsdsf

Dummy variables 𝑓 𝑔 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 477	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → 𝑦 ∈ 𝐼)
2		prdsdsf.r	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑅 ∈ 𝑍)
3		elex 3212	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑅 ∈ 𝑍 → 𝑅 ∈ V)
4	2, 3	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑅 ∈ V)
5	4	ralrimiva 2966	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝑅 ∈ V)
6	5	adantr 481	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 𝑅 ∈ V)
7		nfcsb1v 3549	. . . . . . . . . . . . . . . . 17 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝑅
8	7	nfel1 2779	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝑅 ∈ V
9		csbeq1a 3542	. . . . . . . . . . . . . . . . 17 ⊢ (𝑥 = 𝑦 → 𝑅 = ⦋𝑦 / 𝑥⦌𝑅)
10	9	eleq1d 2686	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (𝑅 ∈ V ↔ ⦋𝑦 / 𝑥⦌𝑅 ∈ V))
11	8, 10	rspc 3303	. . . . . . . . . . . . . . 15 ⊢ (𝑦 ∈ 𝐼 → (∀𝑥 ∈ 𝐼 𝑅 ∈ V → ⦋𝑦 / 𝑥⦌𝑅 ∈ V))
12	6, 11	mpan9 486	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ⦋𝑦 / 𝑥⦌𝑅 ∈ V)
13		eqid 2622	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ 𝐼 ↦ 𝑅) = (𝑥 ∈ 𝐼 ↦ 𝑅)
14	13	fvmpts 6285	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ 𝐼 ∧ ⦋𝑦 / 𝑥⦌𝑅 ∈ V) → ((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦) = ⦋𝑦 / 𝑥⦌𝑅)
15	1, 12, 14	syl2anc 693	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦) = ⦋𝑦 / 𝑥⦌𝑅)
16	15	fveq2d 6195	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → (dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦)) = (dist‘⦋𝑦 / 𝑥⦌𝑅))
17	16	oveqd 6667	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦)) = ((𝑓‘𝑦)(dist‘⦋𝑦 / 𝑥⦌𝑅)(𝑔‘𝑦)))
18		prdsdsf.y	. . . . . . . . . . . . . 14 ⊢ 𝑌 = (𝑆Xs(𝑥 ∈ 𝐼 ↦ 𝑅))
19		prdsdsf.b	. . . . . . . . . . . . . 14 ⊢ 𝐵 = (Base‘𝑌)
20		prdsdsf.s	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑆 ∈ 𝑊)
21	20	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 𝑆 ∈ 𝑊)
22		prdsdsf.i	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝐼 ∈ 𝑋)
23	22	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 𝐼 ∈ 𝑋)
24		prdsdsf.v	. . . . . . . . . . . . . 14 ⊢ 𝑉 = (Base‘𝑅)
25		simprl 794	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 𝑓 ∈ 𝐵)
26	18, 19, 21, 23, 6, 24, 25	prdsbascl 16143	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 (𝑓‘𝑥) ∈ 𝑉)
27		nfcsb1v 3549	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝑉
28	27	nfel2 2781	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉
29		fveq2 6191	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → (𝑓‘𝑥) = (𝑓‘𝑦))
30		csbeq1a 3542	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → 𝑉 = ⦋𝑦 / 𝑥⦌𝑉)
31	29, 30	eleq12d 2695	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → ((𝑓‘𝑥) ∈ 𝑉 ↔ (𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉))
32	28, 31	rspc 3303	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ 𝐼 → (∀𝑥 ∈ 𝐼 (𝑓‘𝑥) ∈ 𝑉 → (𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉))
33	26, 32	mpan9 486	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → (𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉)
34		simprr 796	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 𝑔 ∈ 𝐵)
35	18, 19, 21, 23, 6, 24, 34	prdsbascl 16143	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 (𝑔‘𝑥) ∈ 𝑉)
36	27	nfel2 2781	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉
37		fveq2 6191	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → (𝑔‘𝑥) = (𝑔‘𝑦))
38	37, 30	eleq12d 2695	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → ((𝑔‘𝑥) ∈ 𝑉 ↔ (𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉))
39	36, 38	rspc 3303	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ 𝐼 → (∀𝑥 ∈ 𝐼 (𝑔‘𝑥) ∈ 𝑉 → (𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉))
40	35, 39	mpan9 486	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → (𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉)
41	33, 40	ovresd 6801	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑓‘𝑦)((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))(𝑔‘𝑦)) = ((𝑓‘𝑦)(dist‘⦋𝑦 / 𝑥⦌𝑅)(𝑔‘𝑦)))
42	17, 41	eqtr4d 2659	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦)) = ((𝑓‘𝑦)((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))(𝑔‘𝑦)))
43		prdsdsf.m	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝐸 ∈ (∞Met‘𝑉))
44	43	ralrimiva 2966	. . . . . . . . . . . . 13 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝐸 ∈ (∞Met‘𝑉))
45	44	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 𝐸 ∈ (∞Met‘𝑉))
46		nfcv 2764	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑥dist
47	46, 7	nffv 6198	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥(dist‘⦋𝑦 / 𝑥⦌𝑅)
48	27, 27	nfxp 5142	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥(⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)
49	47, 48	nfres 5398	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))
50		nfcv 2764	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥∞Met
51	50, 27	nffv 6198	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(∞Met‘⦋𝑦 / 𝑥⦌𝑉)
52	49, 51	nfel 2777	. . . . . . . . . . . . 13 ⊢ Ⅎ𝑥((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)) ∈ (∞Met‘⦋𝑦 / 𝑥⦌𝑉)
53		prdsdsf.e	. . . . . . . . . . . . . . 15 ⊢ 𝐸 = ((dist‘𝑅) ↾ (𝑉 × 𝑉))
54	9	fveq2d 6195	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (dist‘𝑅) = (dist‘⦋𝑦 / 𝑥⦌𝑅))
55	30	sqxpeqd 5141	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (𝑉 × 𝑉) = (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))
56	54, 55	reseq12d 5397	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → ((dist‘𝑅) ↾ (𝑉 × 𝑉)) = ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)))
57	53, 56	syl5eq 2668	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → 𝐸 = ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)))
58	30	fveq2d 6195	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → (∞Met‘𝑉) = (∞Met‘⦋𝑦 / 𝑥⦌𝑉))
59	57, 58	eleq12d 2695	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (𝐸 ∈ (∞Met‘𝑉) ↔ ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)) ∈ (∞Met‘⦋𝑦 / 𝑥⦌𝑉)))
60	52, 59	rspc 3303	. . . . . . . . . . . 12 ⊢ (𝑦 ∈ 𝐼 → (∀𝑥 ∈ 𝐼 𝐸 ∈ (∞Met‘𝑉) → ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)) ∈ (∞Met‘⦋𝑦 / 𝑥⦌𝑉)))
61	45, 60	mpan9 486	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)) ∈ (∞Met‘⦋𝑦 / 𝑥⦌𝑉))
62		xmetcl 22136	. . . . . . . . . . 11 ⊢ ((((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)) ∈ (∞Met‘⦋𝑦 / 𝑥⦌𝑉) ∧ (𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉 ∧ (𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉) → ((𝑓‘𝑦)((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))(𝑔‘𝑦)) ∈ ℝ*)
63	61, 33, 40, 62	syl3anc 1326	. . . . . . . . . 10 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑓‘𝑦)((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))(𝑔‘𝑦)) ∈ ℝ*)
64	42, 63	eqeltrd 2701	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦)) ∈ ℝ*)
65		eqid 2622	. . . . . . . . 9 ⊢ (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) = (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦)))
66	64, 65	fmptd 6385	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))):𝐼⟶ℝ*)
67		frn 6053	. . . . . . . 8 ⊢ ((𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))):𝐼⟶ℝ* → ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ⊆ ℝ*)
68	66, 67	syl 17	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ⊆ ℝ*)
69		0xr 10086	. . . . . . . . 9 ⊢ 0 ∈ ℝ*
70	69	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 0 ∈ ℝ*)
71	70	snssd 4340	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → {0} ⊆ ℝ*)
72	68, 71	unssd 3789	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}) ⊆ ℝ*)
73		supxrcl 12145	. . . . . 6 ⊢ ((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}) ⊆ ℝ* → sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ ℝ*)
74	72, 73	syl 17	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ ℝ*)
75		ssun2 3777	. . . . . . 7 ⊢ {0} ⊆ (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0})
76		c0ex 10034	. . . . . . . 8 ⊢ 0 ∈ V
77	76	snss 4316	. . . . . . 7 ⊢ (0 ∈ (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}) ↔ {0} ⊆ (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}))
78	75, 77	mpbir 221	. . . . . 6 ⊢ 0 ∈ (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0})
79		supxrub 12154	. . . . . 6 ⊢ (((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}) ⊆ ℝ* ∧ 0 ∈ (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0})) → 0 ≤ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ))
80	72, 78, 79	sylancl 694	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 0 ≤ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ))
81		elxrge0 12281	. . . . 5 ⊢ (sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ (0[,]+∞) ↔ (sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ ℝ* ∧ 0 ≤ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < )))
82	74, 80, 81	sylanbrc 698	. . . 4 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ (0[,]+∞))
83	82	ralrimivva 2971	. . 3 ⊢ (𝜑 → ∀𝑓 ∈ 𝐵 ∀𝑔 ∈ 𝐵 sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ (0[,]+∞))
84		eqid 2622	. . . 4 ⊢ (𝑓 ∈ 𝐵, 𝑔 ∈ 𝐵 ↦ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < )) = (𝑓 ∈ 𝐵, 𝑔 ∈ 𝐵 ↦ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ))
85	84	fmpt2 7237	. . 3 ⊢ (∀𝑓 ∈ 𝐵 ∀𝑔 ∈ 𝐵 sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ (0[,]+∞) ↔ (𝑓 ∈ 𝐵, 𝑔 ∈ 𝐵 ↦ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < )):(𝐵 × 𝐵)⟶(0[,]+∞))
86	83, 85	sylib 208	. 2 ⊢ (𝜑 → (𝑓 ∈ 𝐵, 𝑔 ∈ 𝐵 ↦ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < )):(𝐵 × 𝐵)⟶(0[,]+∞))
87		mptexg 6484	. . . . 5 ⊢ (𝐼 ∈ 𝑋 → (𝑥 ∈ 𝐼 ↦ 𝑅) ∈ V)
88	22, 87	syl 17	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝑅) ∈ V)
89	2	ralrimiva 2966	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝑅 ∈ 𝑍)
90		dmmptg 5632	. . . . 5 ⊢ (∀𝑥 ∈ 𝐼 𝑅 ∈ 𝑍 → dom (𝑥 ∈ 𝐼 ↦ 𝑅) = 𝐼)
91	89, 90	syl 17	. . . 4 ⊢ (𝜑 → dom (𝑥 ∈ 𝐼 ↦ 𝑅) = 𝐼)
92		prdsdsf.d	. . . 4 ⊢ 𝐷 = (dist‘𝑌)
93	18, 20, 88, 19, 91, 92	prdsds 16124	. . 3 ⊢ (𝜑 → 𝐷 = (𝑓 ∈ 𝐵, 𝑔 ∈ 𝐵 ↦ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < )))
94	93	feq1d 6030	. 2 ⊢ (𝜑 → (𝐷:(𝐵 × 𝐵)⟶(0[,]+∞) ↔ (𝑓 ∈ 𝐵, 𝑔 ∈ 𝐵 ↦ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < )):(𝐵 × 𝐵)⟶(0[,]+∞)))
95	86, 94	mpbird 247	1 ⊢ (𝜑 → 𝐷:(𝐵 × 𝐵)⟶(0[,]+∞))

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990  ∀wral 2912  Vcvv 3200  ⦋csb 3533   ∪ cun 3572   ⊆ wss 3574  {csn 4177   class class class wbr 4653   ↦ cmpt 4729   × cxp 5112  dom cdm 5114  ran crn 5115   ↾ cres 5116  ⟶wf 5884  ‘cfv 5888  (class class class)co 6650   ↦ cmpt2 6652  supcsup 8346  0cc0 9936  +∞cpnf 10071  ℝ^*cxr 10073   < clt 10074   ≤ cle 10075  [,]cicc 12178  Basecbs 15857  distcds 15950  X_scprds 16106  ∞Metcxmt 19731

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013  ax-pre-sup 10014

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-map 7859  df-ixp 7909  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-sup 8348  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-3 11080  df-4 11081  df-5 11082  df-6 11083  df-7 11084  df-8 11085  df-9 11086  df-n0 11293  df-z 11378  df-dec 11494  df-uz 11688  df-icc 12182  df-fz 12327  df-struct 15859  df-ndx 15860  df-slot 15861  df-base 15863  df-plusg 15954  df-mulr 15955  df-sca 15957  df-vsca 15958  df-ip 15959  df-tset 15960  df-ple 15961  df-ds 15964  df-hom 15966  df-cco 15967  df-prds 16108  df-xmet 19739

This theorem is referenced by:  prdsxmetlem  22173  prdsmet  22175