xlimbr - Mathbox for Glauco Siliprandi

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Theorem xlimbr 44543

Description: Express the binary relation "sequence 𝐹 converges to point 𝑃 " w.r.t. the standard topology on the extended reals. (Contributed by Glauco Siliprandi, 5-Feb-2022.)

**Hypotheses**
Ref	Expression
xlimbr.k	⊢ Ⅎ𝑘𝐹
xlimbr.m	⊢ (𝜑 → 𝑀 ∈ ℤ)
xlimbr.z	⊢ 𝑍 = (ℤ_≥‘𝑀)
xlimbr.f	⊢ (𝜑 → 𝐹:𝑍⟶ℝ^*)
xlimbr.j	⊢ 𝐽 = (ordTop‘ ≤ )

**Assertion**
Ref	Expression
xlimbr	⊢ (𝜑 → (𝐹~~>𝑃 ↔ (𝑃 ∈ ℝ^ ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))))

Distinct variable groups: 𝑗,𝐹,𝑢 𝑢,𝐽 𝑗,𝑀,𝑢 𝑢,𝑃 𝑗,𝑍,𝑘 𝑢,𝑘 Allowed substitution hints: 𝜑(𝑢,𝑗,𝑘) 𝑃(𝑗,𝑘) 𝐹(𝑘) 𝐽(𝑗,𝑘) 𝑀(𝑘) 𝑍(𝑢)

**Proof of Theorem xlimbr**
Step	Hyp	Ref	Expression
1		df-xlim 44535	. . . 4 ⊢ ~~>* = (⇝_𝑡‘(ordTop‘ ≤ ))
2	1	breqi 5155	. . 3 ⊢ (𝐹~~>*𝑃 ↔ 𝐹(⇝_𝑡‘(ordTop‘ ≤ ))𝑃)
3	2	a1i 11	. 2 ⊢ (𝜑 → (𝐹~~>*𝑃 ↔ 𝐹(⇝_𝑡‘(ordTop‘ ≤ ))𝑃))
4		xlimbr.k	. . 3 ⊢ Ⅎ𝑘𝐹
5		letopon 22709	. . . 4 ⊢ (ordTop‘ ≤ ) ∈ (TopOn‘ℝ^*)
6	5	a1i 11	. . 3 ⊢ (𝜑 → (ordTop‘ ≤ ) ∈ (TopOn‘ℝ^*))
7	4, 6	lmbr3 44463	. 2 ⊢ (𝜑 → (𝐹(⇝_𝑡‘(ordTop‘ ≤ ))𝑃 ↔ (𝐹 ∈ (ℝ^* ↑_pm ℂ) ∧ 𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))))
8		simpr2 1196	. . . 4 ⊢ ((𝜑 ∧ (𝐹 ∈ (ℝ^* ↑_pm ℂ) ∧ 𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → 𝑃 ∈ ℝ^*)
9		xlimbr.j	. . . . . . . 8 ⊢ 𝐽 = (ordTop‘ ≤ )
10	9	eqcomi 2742	. . . . . . 7 ⊢ (ordTop‘ ≤ ) = 𝐽
11	10	raleqi 3324	. . . . . 6 ⊢ (∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) ↔ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
12		xlimbr.m	. . . . . . . 8 ⊢ (𝜑 → 𝑀 ∈ ℤ)
13		xlimbr.z	. . . . . . . . . . . . 13 ⊢ 𝑍 = (ℤ_≥‘𝑀)
14	13	rexuz3 15295	. . . . . . . . . . . 12 ⊢ (𝑀 ∈ ℤ → (∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
15	14	bicomd 222	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℤ → (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢) ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
16	15	imbi2d 341	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℤ → ((𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) ↔ (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
17	16	biimpd 228	. . . . . . . . 9 ⊢ (𝑀 ∈ ℤ → ((𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) → (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
18	17	ralimdv 3170	. . . . . . . 8 ⊢ (𝑀 ∈ ℤ → (∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
19	12, 18	syl 17	. . . . . . 7 ⊢ (𝜑 → (∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
20	19	imp 408	. . . . . 6 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
21	11, 20	sylan2b 595	. . . . 5 ⊢ ((𝜑 ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
22	21	3ad2antr3 1191	. . . 4 ⊢ ((𝜑 ∧ (𝐹 ∈ (ℝ^* ↑_pm ℂ) ∧ 𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
23	8, 22	jca 513	. . 3 ⊢ ((𝜑 ∧ (𝐹 ∈ (ℝ^* ↑_pm ℂ) ∧ 𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → (𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
24		cnex 11191	. . . . . . 7 ⊢ ℂ ∈ V
25	24	a1i 11	. . . . . 6 ⊢ (𝜑 → ℂ ∈ V)
26	6	elfvexd 6931	. . . . . 6 ⊢ (𝜑 → ℝ^* ∈ V)
27	13	uzsscn2 44188	. . . . . . 7 ⊢ 𝑍 ⊆ ℂ
28	27	a1i 11	. . . . . 6 ⊢ (𝜑 → 𝑍 ⊆ ℂ)
29		xlimbr.f	. . . . . 6 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ^*)
30	25, 26, 28, 29	fpmd 43968	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ (ℝ^* ↑_pm ℂ))
31	30	adantr 482	. . . 4 ⊢ ((𝜑 ∧ (𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → 𝐹 ∈ (ℝ^* ↑_pm ℂ))
32		simprl 770	. . . 4 ⊢ ((𝜑 ∧ (𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → 𝑃 ∈ ℝ^*)
33	16	biimprd 247	. . . . . . . . 9 ⊢ (𝑀 ∈ ℤ → ((𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) → (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
34	33	ralimdv 3170	. . . . . . . 8 ⊢ (𝑀 ∈ ℤ → (∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
35	12, 34	syl 17	. . . . . . 7 ⊢ (𝜑 → (∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
36	35	imp 408	. . . . . 6 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))) → ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
37	9	raleqi 3324	. . . . . 6 ⊢ (∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)) ↔ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
38	36, 37	sylib 217	. . . . 5 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))) → ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
39	38	adantrl 715	. . . 4 ⊢ ((𝜑 ∧ (𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))
40	31, 32, 39	3jca 1129	. . 3 ⊢ ((𝜑 ∧ (𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))) → (𝐹 ∈ (ℝ^* ↑_pm ℂ) ∧ 𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))))
41	23, 40	impbida 800	. 2 ⊢ (𝜑 → ((𝐹 ∈ (ℝ^* ↑_pm ℂ) ∧ 𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ (ordTop‘ ≤ )(𝑃 ∈ 𝑢 → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢))) ↔ (𝑃 ∈ ℝ^* ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))))
42	3, 7, 41	3bitrd 305	1 ⊢ (𝜑 → (𝐹~~>𝑃 ↔ (𝑃 ∈ ℝ^ ∧ ∀𝑢 ∈ 𝐽 (𝑃 ∈ 𝑢 → ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ_≥‘𝑗)(𝑘 ∈ dom 𝐹 ∧ (𝐹‘𝑘) ∈ 𝑢)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 Ⅎwnfc 2884 ∀wral 3062 ∃wrex 3071 Vcvv 3475 ⊆ wss 3949 class class class wbr 5149 dom cdm 5677 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 ↑_pm cpm 8821 ℂcc 11108 ℝ^*cxr 11247 ≤ cle 11249 ℤcz 12558 ℤ_≥cuz 12822 ordTopcordt 17445 TopOnctopon 22412 ⇝_𝑡clm 22730 ~~>*clsxlim 44534

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-addrcl 11171 ax-rnegex 11181 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185

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-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-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 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-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 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-om 7856 df-1st 7975 df-2nd 7976 df-1o 8466 df-er 8703 df-pm 8823 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-fi 9406 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-topgen 17389 df-ordt 17447 df-ps 18519 df-tsr 18520 df-top 22396 df-topon 22413 df-bases 22449 df-lm 22733 df-xlim 44535

This theorem is referenced by: xlimxrre 44547

W3C validator