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Theorem iscau3 24795

Description: Express the Cauchy sequence property in the more conventional three-quantifier form. (Contributed by NM, 19-Dec-2006.) (Revised by Mario Carneiro, 14-Nov-2013.)

**Hypotheses**
Ref	Expression
iscau3.2	⊢ 𝑍 = (ℤ_≥‘𝑀)
iscau3.3	⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋))
iscau3.4	⊢ (𝜑 → 𝑀 ∈ ℤ)

**Assertion**
Ref	Expression
iscau3	⊢ (𝜑 → (𝐹 ∈ (Cau‘𝐷) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))))

Distinct variable groups: 𝑗,𝑘,𝑚,𝑥,𝐷 𝑗,𝐹,𝑘,𝑚,𝑥 𝜑,𝑗,𝑘,𝑥 𝑗,𝑋,𝑘,𝑚,𝑥 𝑗,𝑀 𝑗,𝑍,𝑘,𝑥 Allowed substitution hints: 𝜑(𝑚) 𝑀(𝑥,𝑘,𝑚) 𝑍(𝑚)

**Proof of Theorem iscau3**
Step	Hyp	Ref	Expression
1		iscau3.3	. . 3 ⊢ (𝜑 → 𝐷 ∈ (∞Met‘𝑋))
2		iscau2 24794	. . 3 ⊢ (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))))
3	1, 2	syl 17	. 2 ⊢ (𝜑 → (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))))
4	1	adantr 482	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → 𝐷 ∈ (∞Met‘𝑋))
5		ssid 4005	. . . . . . 7 ⊢ ℤ ⊆ ℤ
6		simpr 486	. . . . . . 7 ⊢ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) → (𝐹‘𝑘) ∈ 𝑋)
7		eleq1 2822	. . . . . . 7 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑗) → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑗) ∈ 𝑋))
8		eleq1 2822	. . . . . . 7 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑚) → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑚) ∈ 𝑋))
9		xmetsym 23853	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
10	9	fveq2d 6896	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑘))) = ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))))
11		xmetsym 23853	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑚)𝐷(𝐹‘𝑗)) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚)))
12	11	fveq2d 6896	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ( I ‘((𝐹‘𝑚)𝐷(𝐹‘𝑗))) = ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))))
13		simp1 1137	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝐷 ∈ (∞Met‘𝑋))
14		simp2l 1200	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑘) ∈ 𝑋)
15		simp3l 1202	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑗) ∈ 𝑋)
16		xmetcl 23837	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ^*)
17	13, 14, 15, 16	syl3anc 1372	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ^*)
18		simp2r 1201	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑚) ∈ 𝑋)
19		xmetcl 23837	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
20	13, 15, 18, 19	syl3anc 1372	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
21		simp3r 1203	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ)
22	21	rehalfcld 12459	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝑥 / 2) ∈ ℝ)
23	22	rexrd 11264	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝑥 / 2) ∈ ℝ^*)
24		xlt2add 13239	. . . . . . . . . 10 ⊢ (((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ^* ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ^) ∧ ((𝑥 / 2) ∈ ℝ^ ∧ (𝑥 / 2) ∈ ℝ^*)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2) ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2)) → (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < ((𝑥 / 2) +_𝑒 (𝑥 / 2))))
25	17, 20, 23, 23, 24	syl22anc 838	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2) ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2)) → (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < ((𝑥 / 2) +_𝑒 (𝑥 / 2))))
26	22, 22	rexaddd 13213	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) +_𝑒 (𝑥 / 2)) = ((𝑥 / 2) + (𝑥 / 2)))
27	21	recnd 11242	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℂ)
28	27	2halvesd 12458	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) + (𝑥 / 2)) = 𝑥)
29	26, 28	eqtrd 2773	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) +_𝑒 (𝑥 / 2)) = 𝑥)
30	29	breq2d 5161	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < ((𝑥 / 2) +_𝑒 (𝑥 / 2)) ↔ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < 𝑥))
31		xmettri 23857	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ≤ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))))
32	13, 14, 18, 15, 31	syl13anc 1373	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ≤ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))))
33		xmetcl 23837	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
34	13, 14, 18, 33	syl3anc 1372	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
35	17, 20	xaddcld 13280	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) ∈ ℝ^*)
36	21	rexrd 11264	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ^*)
37		xrlelttr 13135	. . . . . . . . . . . 12 ⊢ ((((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ ℝ^* ∧ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) ∈ ℝ^* ∧ 𝑥 ∈ ℝ^*) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ≤ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) ∧ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < 𝑥) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
38	34, 35, 36, 37	syl3anc 1372	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ≤ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) ∧ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < 𝑥) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
39	32, 38	mpand 694	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < 𝑥 → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
40	30, 39	sylbid 239	. . . . . . . . 9 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < ((𝑥 / 2) +_𝑒 (𝑥 / 2)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
41	25, 40	syld 47	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2) ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
42		ovex 7442	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ V
43		fvi 6968	. . . . . . . . . . 11 ⊢ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ V → ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
44	42, 43	ax-mp 5	. . . . . . . . . 10 ⊢ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗))
45	44	breq1i 5156	. . . . . . . . 9 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < (𝑥 / 2) ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2))
46		ovex 7442	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ V
47		fvi 6968	. . . . . . . . . . 11 ⊢ (((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ V → ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚)))
48	46, 47	ax-mp 5	. . . . . . . . . 10 ⊢ ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚))
49	48	breq1i 5156	. . . . . . . . 9 ⊢ (( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < (𝑥 / 2) ↔ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2))
50	45, 49	anbi12i 628	. . . . . . . 8 ⊢ ((( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < (𝑥 / 2) ∧ ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < (𝑥 / 2)) ↔ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2) ∧ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2)))
51		ovex 7442	. . . . . . . . . 10 ⊢ ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ V
52		fvi 6968	. . . . . . . . . 10 ⊢ (((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ V → ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑚)))
53	51, 52	ax-mp 5	. . . . . . . . 9 ⊢ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑚))
54	53	breq1i 5156	. . . . . . . 8 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)
55	41, 50, 54	3imtr4g 296	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < (𝑥 / 2) ∧ ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < (𝑥 / 2)) → ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥))
56	5, 6, 7, 8, 10, 12, 55	cau3lem 15301	. . . . . 6 ⊢ (𝐷 ∈ (∞Met‘𝑋) → (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥)))
57	4, 56	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥)))
58	44	breq1i 5156	. . . . . . . . . 10 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)
59	58	anbi2i 624	. . . . . . . . 9 ⊢ (((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
60		df-3an 1090	. . . . . . . . 9 ⊢ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) ↔ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
61	59, 60	bitr4i 278	. . . . . . . 8 ⊢ (((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ (𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
62	61	ralbii 3094	. . . . . . 7 ⊢ (∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
63	62	rexbii 3095	. . . . . 6 ⊢ (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
64	63	ralbii 3094	. . . . 5 ⊢ (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥))
65	54	ralbii 3094	. . . . . . . . . 10 ⊢ (∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥 ↔ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)
66	65	anbi2i 624	. . . . . . . . 9 ⊢ (((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥) ↔ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
67		df-3an 1090	. . . . . . . . 9 ⊢ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥) ↔ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
68	66, 67	bitr4i 278	. . . . . . . 8 ⊢ (((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥) ↔ (𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
69	68	ralbii 3094	. . . . . . 7 ⊢ (∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥) ↔ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
70	69	rexbii 3095	. . . . . 6 ⊢ (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
71	70	ralbii 3094	. . . . 5 ⊢ (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
72	57, 64, 71	3bitr3g 313	. . . 4 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)))
73		iscau3.4	. . . . . . 7 ⊢ (𝜑 → 𝑀 ∈ ℤ)
74	73	adantr 482	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → 𝑀 ∈ ℤ)
75		iscau3.2	. . . . . . 7 ⊢ 𝑍 = (ℤ_≥‘𝑀)
76	75	rexuz3 15295	. . . . . 6 ⊢ (𝑀 ∈ ℤ → (∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)))
77	74, 76	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)))
78	77	ralbidv 3178	. . . 4 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)))
79	72, 78	bitr4d 282	. . 3 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → (∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥) ↔ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)))
80	79	pm5.32da 580	. 2 ⊢ (𝜑 → ((𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))))
81	3, 80	bitrd 279	1 ⊢ (𝜑 → (𝐹 ∈ (Cau‘𝐷) ↔ (𝐹 ∈ (𝑋 ↑_pm ℂ) ∧ ∀𝑥 ∈ ℝ⁺ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 ∀wral 3062 ∃wrex 3071 Vcvv 3475 class class class wbr 5149 I cid 5574 dom cdm 5677 ‘cfv 6544 (class class class)co 7409 ↑_pm cpm 8821 ℂcc 11108 ℝcr 11109 + caddc 11113 ℝ^*cxr 11247 < clt 11248 ≤ cle 11249 / cdiv 11871 2c2 12267 ℤcz 12558 ℤ_≥cuz 12822 ℝ⁺crp 12974 +_𝑒 cxad 13090 ∞Metcxmet 20929 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 ax-pre-mulgt0 11187

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-rmo 3377 df-reu 3378 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-riota 7365 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-sub 11446 df-neg 11447 df-div 11872 df-2 12275 df-z 12559 df-uz 12823 df-rp 12975 df-xneg 13092 df-xadd 13093 df-psmet 20936 df-xmet 20937 df-bl 20939 df-cau 24773

This theorem is referenced by: iscau4 24796 caucfil 24800 cmetcaulem 24805 heibor1lem 36677

W3C validator