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Theorem iscau3 24129

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 24128	. . 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 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → 𝐷 ∈ (∞Met‘𝑋))
5		ssid 3909	. . . . . . 7 ⊢ ℤ ⊆ ℤ
6		simpr 488	. . . . . . 7 ⊢ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) → (𝐹‘𝑘) ∈ 𝑋)
7		eleq1 2818	. . . . . . 7 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑗) → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑗) ∈ 𝑋))
8		eleq1 2818	. . . . . . 7 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑚) → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑚) ∈ 𝑋))
9		xmetsym 23199	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
10	9	fveq2d 6699	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑘))) = ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))))
11		xmetsym 23199	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑚)𝐷(𝐹‘𝑗)) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚)))
12	11	fveq2d 6699	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ( I ‘((𝐹‘𝑚)𝐷(𝐹‘𝑗))) = ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))))
13		simp1 1138	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝐷 ∈ (∞Met‘𝑋))
14		simp2l 1201	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑘) ∈ 𝑋)
15		simp3l 1203	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑗) ∈ 𝑋)
16		xmetcl 23183	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ^*)
17	13, 14, 15, 16	syl3anc 1373	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ^*)
18		simp2r 1202	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑚) ∈ 𝑋)
19		xmetcl 23183	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
20	13, 15, 18, 19	syl3anc 1373	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
21		simp3r 1204	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ)
22	21	rehalfcld 12042	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝑥 / 2) ∈ ℝ)
23	22	rexrd 10848	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝑥 / 2) ∈ ℝ^*)
24		xlt2add 12815	. . . . . . . . . 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 839	. . . . . . . . 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 12789	. . . . . . . . . . . 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 10826	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℂ)
28	27	2halvesd 12041	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) + (𝑥 / 2)) = 𝑥)
29	26, 28	eqtrd 2771	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) +_𝑒 (𝑥 / 2)) = 𝑥)
30	29	breq2d 5051	. . . . . . . . . 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 23203	. . . . . . . . . . . 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 1374	. . . . . . . . . . 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 23183	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ ℝ^*)
34	13, 14, 18, 33	syl3anc 1373	. . . . . . . . . . . 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 12856	. . . . . . . . . . . 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 10848	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ^*)
37		xrlelttr 12711	. . . . . . . . . . . 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 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))) ∧ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) +_𝑒 ((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < 𝑥) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥))
39	32, 38	mpand 695	. . . . . . . . . 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 243	. . . . . . . . 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 7224	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ V
43		fvi 6765	. . . . . . . . . . 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 5046	. . . . . . . . 9 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < (𝑥 / 2) ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2))
46		ovex 7224	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ V
47		fvi 6765	. . . . . . . . . . 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 5046	. . . . . . . . 9 ⊢ (( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < (𝑥 / 2) ↔ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2))
50	45, 49	anbi12i 630	. . . . . . . 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 7224	. . . . . . . . . 10 ⊢ ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ V
52		fvi 6765	. . . . . . . . . 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 5046	. . . . . . . 8 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)
55	41, 50, 54	3imtr4g 299	. . . . . . 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 14883	. . . . . 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 5046	. . . . . . . . . 10 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)
59	58	anbi2i 626	. . . . . . . . 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 1091	. . . . . . . . 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 281	. . . . . . . 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 3078	. . . . . . 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 3160	. . . . . 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 3078	. . . . 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 3078	. . . . . . . . . 10 ⊢ (∀𝑚 ∈ (ℤ_≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥 ↔ ∀𝑚 ∈ (ℤ_≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)
66	65	anbi2i 626	. . . . . . . . 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 1091	. . . . . . . . 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 281	. . . . . . . 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 3078	. . . . . . 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 3160	. . . . . 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 3078	. . . . 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 316	. . . 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 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑_pm ℂ)) → 𝑀 ∈ ℤ)
75		iscau3.2	. . . . . . 7 ⊢ 𝑍 = (ℤ_≥‘𝑀)
76	75	rexuz3 14877	. . . . . 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 3108	. . . 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 285	. . 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 582	. 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 282	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 209 ∧ wa 399 ∧ w3a 1089 = wceq 1543 ∈ wcel 2112 ∀wral 3051 ∃wrex 3052 Vcvv 3398 class class class wbr 5039 I cid 5439 dom cdm 5536 ‘cfv 6358 (class class class)co 7191 ↑_pm cpm 8487 ℂcc 10692 ℝcr 10693 + caddc 10697 ℝ^*cxr 10831 < clt 10832 ≤ cle 10833 / cdiv 11454 2c2 11850 ℤcz 12141 ℤ_≥cuz 12403 ℝ⁺crp 12551 +_𝑒 cxad 12667 ∞Metcxmet 20302 Cauccau 24104

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 ax-cnex 10750 ax-resscn 10751 ax-1cn 10752 ax-icn 10753 ax-addcl 10754 ax-addrcl 10755 ax-mulcl 10756 ax-mulrcl 10757 ax-mulcom 10758 ax-addass 10759 ax-mulass 10760 ax-distr 10761 ax-i2m1 10762 ax-1ne0 10763 ax-1rid 10764 ax-rnegex 10765 ax-rrecex 10766 ax-cnre 10767 ax-pre-lttri 10768 ax-pre-lttrn 10769 ax-pre-ltadd 10770 ax-pre-mulgt0 10771

This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-iun 4892 df-br 5040 df-opab 5102 df-mpt 5121 df-id 5440 df-po 5453 df-so 5454 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7148 df-ov 7194 df-oprab 7195 df-mpo 7196 df-1st 7739 df-2nd 7740 df-er 8369 df-map 8488 df-pm 8489 df-en 8605 df-dom 8606 df-sdom 8607 df-pnf 10834 df-mnf 10835 df-xr 10836 df-ltxr 10837 df-le 10838 df-sub 11029 df-neg 11030 df-div 11455 df-2 11858 df-z 12142 df-uz 12404 df-rp 12552 df-xneg 12669 df-xadd 12670 df-psmet 20309 df-xmet 20310 df-bl 20312 df-cau 24107

This theorem is referenced by: iscau4 24130 caucfil 24134 cmetcaulem 24139 heibor1lem 35653

W3C validator