Theorem iscau3 23076

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 23075	. . 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 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑pm ℂ)) → 𝐷 ∈ (∞Met‘𝑋))
5		ssid 3624	. . . . . . 7 ⊢ ℤ ⊆ ℤ
6		simpr 477	. . . . . . 7 ⊢ ((𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑋) → (𝐹‘𝑘) ∈ 𝑋)
7		eleq1 2689	. . . . . . 7 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑗) → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑗) ∈ 𝑋))
8		eleq1 2689	. . . . . . 7 ⊢ ((𝐹‘𝑘) = (𝐹‘𝑚) → ((𝐹‘𝑘) ∈ 𝑋 ↔ (𝐹‘𝑚) ∈ 𝑋))
9		xmetsym 22152	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑘)) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
10	9	fveq2d 6195	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑘) ∈ 𝑋) → ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑘))) = ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))))
11		xmetsym 22152	. . . . . . . 8 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑚)𝐷(𝐹‘𝑗)) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚)))
12	11	fveq2d 6195	. . . . . . 7 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑚) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ( I ‘((𝐹‘𝑚)𝐷(𝐹‘𝑗))) = ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))))
13		simp1 1061	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝐷 ∈ (∞Met‘𝑋))
14		simp2l 1087	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑘) ∈ 𝑋)
15		simp3l 1089	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑗) ∈ 𝑋)
16		xmetcl 22136	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑗) ∈ 𝑋) → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ*)
17	13, 14, 15, 16	syl3anc 1326	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ ℝ*)
18		simp2r 1088	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝐹‘𝑚) ∈ 𝑋)
19		xmetcl 22136	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑗) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) → ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ*)
20	13, 15, 18, 19	syl3anc 1326	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ ℝ*)
21		simp3r 1090	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ)
22	21	rehalfcld 11279	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝑥 / 2) ∈ ℝ)
23	22	rexrd 10089	. . . . . . . . . 10 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → (𝑥 / 2) ∈ ℝ*)
24		xlt2add 12090	. . . . . . . . . 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 1327	. . . . . . . . 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		rexadd 12063	. . . . . . . . . . . . 13 ⊢ (((𝑥 / 2) ∈ ℝ ∧ (𝑥 / 2) ∈ ℝ) → ((𝑥 / 2) +𝑒 (𝑥 / 2)) = ((𝑥 / 2) + (𝑥 / 2)))
27	22, 22, 26	syl2anc 693	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) +𝑒 (𝑥 / 2)) = ((𝑥 / 2) + (𝑥 / 2)))
28	21	recnd 10068	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℂ)
29	28	2halvesd 11278	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) + (𝑥 / 2)) = 𝑥)
30	27, 29	eqtrd 2656	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝑥 / 2) +𝑒 (𝑥 / 2)) = 𝑥)
31	30	breq2d 4665	. . . . . . . . . 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))
32		xmettri 22156	. . . . . . . . . . . 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))))
33	13, 14, 18, 15, 32	syl13anc 1328	. . . . . . . . . . 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))))
34		xmetcl 22136	. . . . . . . . . . . . 13 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ ℝ*)
35	13, 14, 18, 34	syl3anc 1326	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ ℝ*)
36	17, 20	xaddcld 12131	. . . . . . . . . . . 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*)
37	21	rexrd 10089	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ (∞Met‘𝑋) ∧ ((𝐹‘𝑘) ∈ 𝑋 ∧ (𝐹‘𝑚) ∈ 𝑋) ∧ ((𝐹‘𝑗) ∈ 𝑋 ∧ 𝑥 ∈ ℝ)) → 𝑥 ∈ ℝ*)
38		xrlelttr 11987	. . . . . . . . . . . 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))
39	35, 36, 37, 38	syl3anc 1326	. . . . . . . . . . 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))
40	33, 39	mpand 711	. . . . . . . . . 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))
41	31, 40	sylbid 230	. . . . . . . . 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))
42	25, 41	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))
43		ovex 6678	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ V
44		fvi 6255	. . . . . . . . . . 11 ⊢ (((𝐹‘𝑘)𝐷(𝐹‘𝑗)) ∈ V → ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗)))
45	43, 44	ax-mp 5	. . . . . . . . . 10 ⊢ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑗))
46	45	breq1i 4660	. . . . . . . . 9 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < (𝑥 / 2) ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < (𝑥 / 2))
47		ovex 6678	. . . . . . . . . . 11 ⊢ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ V
48		fvi 6255	. . . . . . . . . . 11 ⊢ (((𝐹‘𝑗)𝐷(𝐹‘𝑚)) ∈ V → ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚)))
49	47, 48	ax-mp 5	. . . . . . . . . 10 ⊢ ( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑗)𝐷(𝐹‘𝑚))
50	49	breq1i 4660	. . . . . . . . 9 ⊢ (( I ‘((𝐹‘𝑗)𝐷(𝐹‘𝑚))) < (𝑥 / 2) ↔ ((𝐹‘𝑗)𝐷(𝐹‘𝑚)) < (𝑥 / 2))
51	46, 50	anbi12i 733	. . . . . . . 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)))
52		ovex 6678	. . . . . . . . . 10 ⊢ ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ V
53		fvi 6255	. . . . . . . . . 10 ⊢ (((𝐹‘𝑘)𝐷(𝐹‘𝑚)) ∈ V → ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑚)))
54	52, 53	ax-mp 5	. . . . . . . . 9 ⊢ ( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) = ((𝐹‘𝑘)𝐷(𝐹‘𝑚))
55	54	breq1i 4660	. . . . . . . 8 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)
56	42, 51, 55	3imtr4g 285	. . . . . . 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))
57	5, 6, 7, 8, 10, 12, 56	cau3lem 14094	. . . . . 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)))
58	4, 57	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)))
59	45	breq1i 4660	. . . . . . . . . 10 ⊢ (( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑗))) < 𝑥 ↔ ((𝐹‘𝑘)𝐷(𝐹‘𝑗)) < 𝑥)
60	59	anbi2i 730	. . . . . . . . 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))
61		df-3an 1039	. . . . . . . . 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))
62	60, 61	bitr4i 267	. . . . . . . 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))
63	62	ralbii 2980	. . . . . . 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))
64	63	rexbii 3041	. . . . . 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))
65	64	ralbii 2980	. . . . 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))
66	55	ralbii 2980	. . . . . . . . . 10 ⊢ (∀𝑚 ∈ (ℤ≥‘𝑘)( I ‘((𝐹‘𝑘)𝐷(𝐹‘𝑚))) < 𝑥 ↔ ∀𝑚 ∈ (ℤ≥‘𝑘)((𝐹‘𝑘)𝐷(𝐹‘𝑚)) < 𝑥)
67	66	anbi2i 730	. . . . . . . . 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))
68		df-3an 1039	. . . . . . . . 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))
69	67, 68	bitr4i 267	. . . . . . . 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))
70	69	ralbii 2980	. . . . . . 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))
71	70	rexbii 3041	. . . . . 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))
72	71	ralbii 2980	. . . . 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))
73	58, 65, 72	3bitr3g 302	. . . 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)))
74		iscau3.4	. . . . . . 7 ⊢ (𝜑 → 𝑀 ∈ ℤ)
75	74	adantr 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝐹 ∈ (𝑋 ↑pm ℂ)) → 𝑀 ∈ ℤ)
76		iscau3.2	. . . . . . 7 ⊢ 𝑍 = (ℤ≥‘𝑀)
77	76	rexuz3 14088	. . . . . 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)))
78	75, 77	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)))
79	78	ralbidv 2986	. . . 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)))
80	73, 79	bitr4d 271	. . 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)))
81	80	pm5.32da 673	. 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))))
82	3, 81	bitrd 268	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))))

Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990  ∀wral 2912  ∃wrex 2913  Vcvv 3200   class class class wbr 4653   I cid 5023  dom cdm 5114  ‘cfv 5888  (class class class)co 6650   ↑_pm cpm 7858  ℂcc 9934  ℝcr 9935   + caddc 9939  ℝ^*cxr 10073   < clt 10074   ≤ cle 10075   / cdiv 10684  2c2 11070  ℤcz 11377  ℤ_≥cuz 11687  ℝ⁺crp 11832   +_𝑒 cxad 11944  ∞Metcxmt 19731  Caucca 23051

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-po 5035  df-so 5036  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-1st 7168  df-2nd 7169  df-er 7742  df-map 7859  df-pm 7860  df-en 7956  df-dom 7957  df-sdom 7958  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-div 10685  df-2 11079  df-z 11378  df-uz 11688  df-rp 11833  df-xneg 11946  df-xadd 11947  df-psmet 19738  df-xmet 19739  df-bl 19741  df-cau 23054

This theorem is referenced by:  iscau4  23077  caucfil  23081  cmetcaulem  23086  heibor1lem  33608