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Theorem iscau2 24794

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 24793	. 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 6929	. . . . . . . . . 10 ⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝑋 ∈ dom ∞Met)
3		cnex 11191	. . . . . . . . . 10 ⊢ ℂ ∈ V
4		elpmg 8837	. . . . . . . . . 10 ⊢ ((𝑋 ∈ dom ∞Met ∧ ℂ ∈ V) → (𝐹 ∈ (𝑋 ↑_pm ℂ) ↔ (Fun 𝐹 ∧ 𝐹 ⊆ (ℂ × 𝑋))))
5	2, 3, 4	sylancl 587	. . . . . . . . 9 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (𝐹 ∈ (𝑋 ↑_pm ℂ) ↔ (Fun 𝐹 ∧ 𝐹 ⊆ (ℂ × 𝑋))))
6	5	simprbda 500	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → Fun 𝐹)
7		ffvresb 7124	. . . . . . . 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 3179	. . . . . 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 482	. . . . 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 12837	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℤ → 𝑗 ∈ (ℤ_≥‘𝑗))
12	11	adantl 483	. . . . . . . . . 10 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ ℝ⁺) ∧ 𝑗 ∈ ℤ) → 𝑗 ∈ (ℤ_≥‘𝑗))
13		eleq1w 2817	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → (𝑘 ∈ dom 𝐹 ↔ 𝑗 ∈ dom 𝐹))
14		fveq2 6892	. . . . . . . . . . . . 13 ⊢ (𝑘 = 𝑗 → (𝐹‘𝑘) = (𝐹‘𝑗))
15	14	eleq1d 2819	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) ↔ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)))
16	13, 15	anbi12d 632	. . . . . . . . . . 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 3609	. . . . . . . . . 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 4334	. . . . . . . . . . . 12 ⊢ ((𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥) → ¬ ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅)
20		blf 23913	. . . . . . . . . . . . . . 15 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (ball‘𝐷):(𝑋 × ℝ^*)⟶𝒫 𝑋)
21	20	fdmd 6729	. . . . . . . . . . . . . 14 ⊢ (𝐷 ∈ (∞Met‘𝑋) → dom (ball‘𝐷) = (𝑋 × ℝ^*))
22		ndmovg 7590	. . . . . . . . . . . . . . 15 ⊢ ((dom (ball‘𝐷) = (𝑋 × ℝ^) ∧ ¬ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ^)) → ((𝐹‘𝑗)(ball‘𝐷)𝑥) = ∅)
23	22	ex 414	. . . . . . . . . . . . . 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 484	. . . . . . . . . . . 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 492	. . . . . . . . . 10 ⊢ (𝐷 ∈ (∞Met‘𝑋) → ((𝑗 ∈ dom 𝐹 ∧ (𝐹‘𝑗) ∈ ((𝐹‘𝑗)(ball‘𝐷)𝑥)) → (𝐹‘𝑗) ∈ 𝑋))
29	28	ad2antrr 725	. . . . . . . . 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 2819	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑗) ∈ 𝑋))
32	14	oveq1d 7424	. . . . . . . . . . . . 13 ⊢ (𝑘 = 𝑗 → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) = ((𝐹‘𝑗)𝐷(𝐹‘𝑗)))
33	32	breq1d 5159	. . . . . . . . . . . 12 ⊢ (𝑘 = 𝑗 → (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥 ↔ ((𝐹‘𝑗)𝐷(𝐹‘𝑗)) < 𝑥))
34	13, 31, 33	3anbi123d 1437	. . . . . . . . . . 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 3609	. . . . . . . . . 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 1138	. . . . . . . . 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 12983	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ ℝ⁺ → 𝑥 ∈ ℝ^*)
40		elbl 23894	. . . . . . . . . . . . . . . 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 1166	. . . . . . . . . . . . . . 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 23853	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
43	42	3expa 1119	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
44	43	3adantl3 1169	. . . . . . . . . . . . . . . . 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 5159	. . . . . . . . . . . . . . . 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 580	. . . . . . . . . . . . . . 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 279	. . . . . . . . . . . . . 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 1127	. . . . . . . . . . . . 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 630	. . . . . . . . . . . 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 1096	. . . . . . . . . . . 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 289	. . . . . . . . . . 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 3178	. . . . . . . . . 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 1122	. . . . . . . . 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 482	. . . . . . . 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 381	. . . . . . 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 3177	. . . . . 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 714	. . . . 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 279	. . . 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 3176	. . 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 580	. 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 279	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 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ∀wral 3062 ∃wrex 3071 Vcvv 3475 ⊆ wss 3949 ∅c0 4323 𝒫 cpw 4603 class class class wbr 5149 × cxp 5675 dom cdm 5677 ↾ cres 5679 Fun wfun 6538 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 ↑_pm cpm 8821 ℂcc 11108 ℝ^*cxr 11247 < clt 11248 ℤcz 12558 ℤ_≥cuz 12822 ℝ⁺crp 12974 ∞Metcxmet 20929 ballcbl 20931 Cauccau 24770

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-po 5589 df-so 5590 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-ov 7412 df-oprab 7413 df-mpo 7414 df-1st 7975 df-2nd 7976 df-er 8703 df-map 8822 df-pm 8823 df-en 8940 df-dom 8941 df-sdom 8942 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-neg 11447 df-z 12559 df-uz 12823 df-rp 12975 df-xadd 13093 df-psmet 20936 df-xmet 20937 df-bl 20939 df-cau 24773

This theorem is referenced by: iscau3 24795 iscau4 24796 caun0 24798 caussi 24814

W3C validator