Theorem prdsdsf 22082

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 3198	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑅 ∈ 𝑍 → 𝑅 ∈ V)
4	2, 3	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐼) → 𝑅 ∈ V)
5	4	ralrimiva 2960	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝑅 ∈ V)
6	5	adantr 481	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 𝑅 ∈ V)
7		nfcsb1v 3530	. . . . . . . . . . . . . . . . 17 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝑅
8	7	nfel1 2775	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝑅 ∈ V
9		csbeq1a 3523	. . . . . . . . . . . . . . . . 17 ⊢ (𝑥 = 𝑦 → 𝑅 = ⦋𝑦 / 𝑥⦌𝑅)
10	9	eleq1d 2683	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (𝑅 ∈ V ↔ ⦋𝑦 / 𝑥⦌𝑅 ∈ V))
11	8, 10	rspc 3289	. . . . . . . . . . . . . . 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 2621	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ 𝐼 ↦ 𝑅) = (𝑥 ∈ 𝐼 ↦ 𝑅)
14	13	fvmpts 6242	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ 𝐼 ∧ ⦋𝑦 / 𝑥⦌𝑅 ∈ V) → ((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦) = ⦋𝑦 / 𝑥⦌𝑅)
15	1, 12, 14	syl2anc 692	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦) = ⦋𝑦 / 𝑥⦌𝑅)
16	15	fveq2d 6152	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → (dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦)) = (dist‘⦋𝑦 / 𝑥⦌𝑅))
17	16	oveqd 6621	. . . . . . . . . . 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 793	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 𝑓 ∈ 𝐵)
26	18, 19, 21, 23, 6, 24, 25	prdsbascl 16064	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 (𝑓‘𝑥) ∈ 𝑉)
27		nfcsb1v 3530	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥⦋𝑦 / 𝑥⦌𝑉
28	27	nfel2 2777	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉
29		fveq2 6148	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → (𝑓‘𝑥) = (𝑓‘𝑦))
30		csbeq1a 3523	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → 𝑉 = ⦋𝑦 / 𝑥⦌𝑉)
31	29, 30	eleq12d 2692	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → ((𝑓‘𝑥) ∈ 𝑉 ↔ (𝑓‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉))
32	28, 31	rspc 3289	. . . . . . . . . . . . 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 795	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 𝑔 ∈ 𝐵)
35	18, 19, 21, 23, 6, 24, 34	prdsbascl 16064	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 (𝑔‘𝑥) ∈ 𝑉)
36	27	nfel2 2777	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉
37		fveq2 6148	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → (𝑔‘𝑥) = (𝑔‘𝑦))
38	37, 30	eleq12d 2692	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → ((𝑔‘𝑥) ∈ 𝑉 ↔ (𝑔‘𝑦) ∈ ⦋𝑦 / 𝑥⦌𝑉))
39	36, 38	rspc 3289	. . . . . . . . . . . . 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 6754	. . . . . . . . . . 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 2658	. . . . . . . . . 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 2960	. . . . . . . . . . . . 13 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝐸 ∈ (∞Met‘𝑉))
45	44	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → ∀𝑥 ∈ 𝐼 𝐸 ∈ (∞Met‘𝑉))
46		nfcv 2761	. . . . . . . . . . . . . . . 16 ⊢ Ⅎ𝑥dist
47	46, 7	nffv 6155	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥(dist‘⦋𝑦 / 𝑥⦌𝑅)
48	27, 27	nfxp 5102	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥(⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)
49	47, 48	nfres 5358	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))
50		nfcv 2761	. . . . . . . . . . . . . . 15 ⊢ Ⅎ𝑥∞Met
51	50, 27	nffv 6155	. . . . . . . . . . . . . 14 ⊢ Ⅎ𝑥(∞Met‘⦋𝑦 / 𝑥⦌𝑉)
52	49, 51	nfel 2773	. . . . . . . . . . . . 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 6152	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (dist‘𝑅) = (dist‘⦋𝑦 / 𝑥⦌𝑅))
55	30	sqxpeqd 5101	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 = 𝑦 → (𝑉 × 𝑉) = (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉))
56	54, 55	reseq12d 5357	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝑦 → ((dist‘𝑅) ↾ (𝑉 × 𝑉)) = ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)))
57	53, 56	syl5eq 2667	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → 𝐸 = ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)))
58	30	fveq2d 6152	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝑦 → (∞Met‘𝑉) = (∞Met‘⦋𝑦 / 𝑥⦌𝑉))
59	57, 58	eleq12d 2692	. . . . . . . . . . . . 13 ⊢ (𝑥 = 𝑦 → (𝐸 ∈ (∞Met‘𝑉) ↔ ((dist‘⦋𝑦 / 𝑥⦌𝑅) ↾ (⦋𝑦 / 𝑥⦌𝑉 × ⦋𝑦 / 𝑥⦌𝑉)) ∈ (∞Met‘⦋𝑦 / 𝑥⦌𝑉)))
60	52, 59	rspc 3289	. . . . . . . . . . . 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 22046	. . . . . . . . . . 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 1323	. . . . . . . . . 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 2698	. . . . . . . . 9 ⊢ (((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) ∧ 𝑦 ∈ 𝐼) → ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦)) ∈ ℝ*)
65		eqid 2621	. . . . . . . . 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 6340	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))):𝐼⟶ℝ*)
67		frn 6010	. . . . . . . 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 10030	. . . . . . . . 9 ⊢ 0 ∈ ℝ*
70	69	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 0 ∈ ℝ*)
71	70	snssd 4309	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → {0} ⊆ ℝ*)
72	68, 71	unssd 3767	. . . . . 6 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}) ⊆ ℝ*)
73		supxrcl 12088	. . . . . 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 3755	. . . . . . 7 ⊢ {0} ⊆ (ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0})
76		c0ex 9978	. . . . . . . 8 ⊢ 0 ∈ V
77	76	snss 4286	. . . . . . 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 12097	. . . . . 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 693	. . . . 5 ⊢ ((𝜑 ∧ (𝑓 ∈ 𝐵 ∧ 𝑔 ∈ 𝐵)) → 0 ≤ sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ))
81		elxrge0 12223	. . . . 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 697	. . . 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 2965	. . 3 ⊢ (𝜑 → ∀𝑓 ∈ 𝐵 ∀𝑔 ∈ 𝐵 sup((ran (𝑦 ∈ 𝐼 ↦ ((𝑓‘𝑦)(dist‘((𝑥 ∈ 𝐼 ↦ 𝑅)‘𝑦))(𝑔‘𝑦))) ∪ {0}), ℝ*, < ) ∈ (0[,]+∞))
84		eqid 2621	. . . 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 7182	. . 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 6438	. . . . 5 ⊢ (𝐼 ∈ 𝑋 → (𝑥 ∈ 𝐼 ↦ 𝑅) ∈ V)
88	22, 87	syl 17	. . . 4 ⊢ (𝜑 → (𝑥 ∈ 𝐼 ↦ 𝑅) ∈ V)
89	2	ralrimiva 2960	. . . . 5 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 𝑅 ∈ 𝑍)
90		dmmptg 5591	. . . . 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 16045	. . 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 5987	. 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 1480   ∈ wcel 1987  ∀wral 2907  Vcvv 3186  ⦋csb 3514   ∪ cun 3553   ⊆ wss 3555  {csn 4148   class class class wbr 4613   ↦ cmpt 4673   × cxp 5072  dom cdm 5074  ran crn 5075   ↾ cres 5076  ⟶wf 5843  ‘cfv 5847  (class class class)co 6604   ↦ cmpt2 6606  supcsup 8290  0cc0 9880  +∞cpnf 10015  ℝ^*cxr 10017   < clt 10018   ≤ cle 10019  [,]cicc 12120  Basecbs 15781  distcds 15871  X_scprds 16027  ∞Metcxmt 19650

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957  ax-pre-sup 9958

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-oadd 7509  df-er 7687  df-map 7804  df-ixp 7853  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-sup 8292  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-nn 10965  df-2 11023  df-3 11024  df-4 11025  df-5 11026  df-6 11027  df-7 11028  df-8 11029  df-9 11030  df-n0 11237  df-z 11322  df-dec 11438  df-uz 11632  df-icc 12124  df-fz 12269  df-struct 15783  df-ndx 15784  df-slot 15785  df-base 15786  df-plusg 15875  df-mulr 15876  df-sca 15878  df-vsca 15879  df-ip 15880  df-tset 15881  df-ple 15882  df-ds 15885  df-hom 15887  df-cco 15888  df-prds 16029  df-xmet 19658

This theorem is referenced by:  prdsxmetlem  22083  prdsmet  22085