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Theorem iscau2 24793

Description: Express the property "𝐹 is a Cauchy sequence of metric 𝐷 " using an arbitrary upper set of integers. (Contributed by NM, 19-Dec-2006.) (Revised by Mario Carneiro, 14-Nov-2013.)

**Assertion**
Ref	Expression
iscau2	⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (Cau‘𝐷) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))))

Distinct variable groups: 𝑗,𝑘,𝑥,𝐷 𝑗,𝐹,𝑘,𝑥 𝑗,𝑋,𝑘,𝑥

**Proof of Theorem iscau2**
Step	Hyp	Ref	Expression
1		iscau 24792	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (Cau‘𝐷) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥))))
2		elfvdm 6928	. . . . . . . . . 10 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 ∈ dom ∞Met)
3		cnex 11190	. . . . . . . . . 10 ⊢ ℂ ∈ V
4		elpmg 8836	. . . . . . . . . 10 ⊢ ((𝑋 ∈ dom ∞Met ∧ ℂ ∈ V) → (𝐹 ∈ (𝑋 ↑_pm ℂ) ↔ (Fun 𝐹 ∧ 𝐹 ⊆ (ℂ × 𝑋))))
5	2, 3, 4	sylancl 586	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (𝑋 ↑_pm ℂ) ↔ (Fun 𝐹 ∧ 𝐹 ⊆ (ℂ × 𝑋))))
6	5	simprbda 499	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → Fun 𝐹)
7		ffvresb 7123	. . . . . . . 8 ⊢ (Fun 𝐹 → ((𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
8	6, 7	syl 17	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → ((𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
9	8	rexbidv 3178	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
10	9	adantr 481	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) ∧ 𝑥 ∈ ℝ⁺) → (∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
11		uzid 12836	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℤ → 𝑗 ∈ (ℤ_≥‘𝑗))
12	11	adantl 482	. . . . . . . . . 10 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → 𝑗 ∈ (ℤ_≥‘𝑗))
13		eleq1w 2816	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → (𝑘 ∈ dom 𝐹 ↔ 𝑗 ∈ dom 𝐹))
14		fveq2 6891	. . . . . . . . . . . . 13 ⊢ (𝑘 = 𝑗 → (𝐹‘𝑘) = (𝐹‘𝑗))
15	14	eleq1d 2818	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)))
16	13, 15	anbi12d 631	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑗 → ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ (𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
17	16	rspcv 3608	. . . . . . . . . 10 ⊢ (𝑗 ∈ (ℤ_≥‘𝑗) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) → (𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
18	12, 17	syl 17	. . . . . . . . 9 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) → (𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥))))
19		n0i 4333	. . . . . . . . . . . 12 ⊢ ((𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) → ¬ ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅)
20		blf 23912	. . . . . . . . . . . . . . 15 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (ball‘𝐷):(𝑋 × ℝ^*)⟶𝒫 𝑋)
21	20	fdmd 6728	. . . . . . . . . . . . . 14 ⊢ (𝐷 ∈ (∞Met‘𝑋) → dom (ball‘𝐷) = (𝑋 × ℝ^*))
22		ndmovg 7589	. . . . . . . . . . . . . . 15 ⊢ ((dom (ball‘𝐷) = (𝑋 × ℝ^) ∧ ¬ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^)) → ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅)
23	22	ex 413	. . . . . . . . . . . . . 14 ⊢ (dom (ball‘𝐷) = (𝑋 × ℝ^) → (¬ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^) → ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅))
24	21, 23	syl 17	. . . . . . . . . . . . 13 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (¬ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^*) → ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅))
25	24	con1d 145	. . . . . . . . . . . 12 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (¬ ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅ → ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^*)))
26		simpl 483	. . . . . . . . . . . 12 ⊢ (((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^*) → (𝐹‘𝑗) ∈ 𝑋)
27	19, 25, 26	syl56 36	. . . . . . . . . . 11 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) → (𝐹‘𝑗) ∈ 𝑋))
28	27	adantld 491	. . . . . . . . . 10 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) → (𝐹‘𝑗) ∈ 𝑋))
29	28	ad2antrr 724	. . . . . . . . 9 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → ((𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) → (𝐹‘𝑗) ∈ 𝑋))
30	18, 29	syld 47	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) → (𝐹‘𝑗) ∈ 𝑋))
31	14	eleq1d 2818	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑗) ∈ 𝑋))
32	14	oveq1d 7423	. . . . . . . . . . . . 13 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) = ((𝐹‘𝑗)𝐷(𝐹‘𝑗)))
33	32	breq1d 5158	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥 ↔ ((𝐹‘𝑗)𝐷(𝐹‘𝑗)) < 𝑥))
34	13, 31, 33	3anbi123d 1436	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑗 → ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) ↔ (𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑗)) < 𝑥)))
35	34	rspcv 3608	. . . . . . . . . 10 ⊢ (𝑗 ∈ (ℤ_≥‘𝑗) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) → (𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑗)) < 𝑥)))
36	12, 35	syl 17	. . . . . . . . 9 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) → (𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑗)) < 𝑥)))
37		simp2 1137	. . . . . . . . 9 ⊢ ((𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑗)) < 𝑥) → (𝐹‘𝑗) ∈ 𝑋)
38	36, 37	syl6 35	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) → (𝐹‘𝑗) ∈ 𝑋))
39		rpxr 12982	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ ℝ⁺ → 𝑥 ∈ ℝ^*)
40		elbl 23893	. . . . . . . . . . . . . . . 16 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^*) → ((𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) < 𝑥)))
41	39, 40	syl3an3 1165	. . . . . . . . . . . . . . 15 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ⁺) → ((𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) < 𝑥)))
42		xmetsym 23852	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
43	42	3expa 1118	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
44	43	3adantl3 1168	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ⁺) ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
45	44	breq1d 5158	. . . . . . . . . . . . . . . 16 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ⁺) ∧ (𝐹‘𝑘) ∈ 𝑋) → (((𝐹‘𝑗)𝐷(𝐹‘𝑘)) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
46	45	pm5.32da 579	. . . . . . . . . . . . . . 15 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ⁺) → (((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) < 𝑥) ↔ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
47	41, 46	bitrd 278	. . . . . . . . . . . . . 14 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ⁺) → ((𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
48	47	3com23 1126	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺ ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
49	48	anbi2d 629	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺ ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ (𝑘 ∈ dom 𝐹 ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))))
50		3anass 1095	. . . . . . . . . . . 12 ⊢ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) ↔ (𝑘 ∈ dom 𝐹 ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
51	49, 50	bitr4di 288	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺ ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ (𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
52	51	ralbidv 3177	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺ ∧ (𝐹‘𝑗) ∈ 𝑋) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
53	52	3expia 1121	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) → ((𝐹‘𝑗) ∈ 𝑋 → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))))
54	53	adantr 481	. . . . . . . 8 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → ((𝐹‘𝑗) ∈ 𝑋 → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))))
55	30, 38, 54	pm5.21ndd 380	. . . . . . 7 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → (∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
56	55	rexbidva 3176	. . . . . 6 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) → (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
57	56	adantlr 713	. . . . 5 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) ∧ 𝑥 ∈ ℝ⁺) → (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
58	10, 57	bitrd 278	. . . 4 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) ∧ 𝑥 ∈ ℝ⁺) → (∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
59	58	ralbidva 3175	. . 3 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)))
60	59	pm5.32da 579	. 2 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ (𝐹 ↾ (ℤ_≥‘𝑗)):(ℤ_≥‘𝑗)⟶((𝐹‘𝑗)(ball‘𝐷)𝑥)) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))))
61	1, 60	bitrd 278	1 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (Cau‘𝐷) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 Vcvv 3474 ⊆ wss 3948 ∅c0 4322 𝒫 cpw 4602 class class class wbr 5148 × cxp 5674 dom cdm 5676 ↾ cres 5678 Fun wfun 6537 ⟶wf 6539 ‘cfv 6543 (class class class)co 7408 ↑_pm cpm 8820 ℂcc 11107 ℝ^*cxr 11246 < clt 11247 ℤcz 12557 ℤ_≥cuz 12821 ℝ⁺crp 12973 ∞Metcxmet 20928 ballcbl 20930 Cauccau 24769

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5574 df-po 5588 df-so 5589 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-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-ov 7411 df-oprab 7412 df-mpo 7413 df-1st 7974 df-2nd 7975 df-er 8702 df-map 8821 df-pm 8822 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-neg 11446 df-z 12558 df-uz 12822 df-rp 12974 df-xadd 13092 df-psmet 20935 df-xmet 20936 df-bl 20938 df-cau 24772

This theorem is referenced by: iscau3 24794 iscau4 24795 caun0 24797 caussi 24813

W3C validator