limsupmnfuzlem - Mathbox for Glauco Siliprandi

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Theorem limsupmnfuzlem 44429

Description: The superior limit of a function is -∞ if and only if every real number is the upper bound of the restriction of the function to a set of upper integers. (Contributed by Glauco Siliprandi, 23-Oct-2021.)

**Hypotheses**
Ref	Expression
limsupmnfuzlem.1	⊢ (𝜑 → 𝑀 ∈ ℤ)
limsupmnfuzlem.2	⊢ 𝑍 = (ℤ_≥‘𝑀)
limsupmnfuzlem.3	⊢ (𝜑 → 𝐹:𝑍⟶ℝ^*)

**Assertion**
Ref	Expression
limsupmnfuzlem	⊢ (𝜑 → ((lim sup‘𝐹) = -∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))

Distinct variable groups: 𝑗,𝐹,𝑘,𝑥 𝑗,𝑀,𝑘 𝑗,𝑍,𝑘,𝑥 𝜑,𝑗,𝑘,𝑥 Allowed substitution hint: 𝑀(𝑥)

Proof of Theorem limsupmnfuzlem Dummy variable 𝑖 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfcv 2904	. . 3 ⊢ Ⅎ𝑗𝐹
2		limsupmnfuzlem.2	. . . . 5 ⊢ 𝑍 = (ℤ_≥‘𝑀)
3		uzssre 12841	. . . . 5 ⊢ (ℤ_≥‘𝑀) ⊆ ℝ
4	2, 3	eqsstri 4016	. . . 4 ⊢ 𝑍 ⊆ ℝ
5	4	a1i 11	. . 3 ⊢ (𝜑 → 𝑍 ⊆ ℝ)
6		limsupmnfuzlem.3	. . 3 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ^*)
7	1, 5, 6	limsupmnf 44424	. 2 ⊢ (𝜑 → ((lim sup‘𝐹) = -∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
8		breq1 5151	. . . . . . . . . 10 ⊢ (𝑘 = 𝑖 → (𝑘 ≤ 𝑗 ↔ 𝑖 ≤ 𝑗))
9	8	imbi1d 342	. . . . . . . . 9 ⊢ (𝑘 = 𝑖 → ((𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
10	9	ralbidv 3178	. . . . . . . 8 ⊢ (𝑘 = 𝑖 → (∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
11	10	cbvrexvw 3236	. . . . . . 7 ⊢ (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
12	11	biimpi 215	. . . . . 6 ⊢ (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
13		iftrue 4534	. . . . . . . . . . . . . 14 ⊢ (𝑀 ≤ (⌈‘𝑖) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = (⌈‘𝑖))
14	13	adantl 483	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = (⌈‘𝑖))
15		limsupmnfuzlem.1	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ∈ ℤ)
16	15	ad2antrr 725	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → 𝑀 ∈ ℤ)
17		ceilcl 13804	. . . . . . . . . . . . . . 15 ⊢ (𝑖 ∈ ℝ → (⌈‘𝑖) ∈ ℤ)
18	17	ad2antlr 726	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → (⌈‘𝑖) ∈ ℤ)
19		simpr 486	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → 𝑀 ≤ (⌈‘𝑖))
20	2, 16, 18, 19	eluzd 44106	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → (⌈‘𝑖) ∈ 𝑍)
21	14, 20	eqeltrd 2834	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
22		iffalse 4537	. . . . . . . . . . . . . 14 ⊢ (¬ 𝑀 ≤ (⌈‘𝑖) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = 𝑀)
23	22	adantl 483	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ ¬ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = 𝑀)
24	15, 2	uzidd2 44113	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑀 ∈ 𝑍)
25	24	ad2antrr 725	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ ¬ 𝑀 ≤ (⌈‘𝑖)) → 𝑀 ∈ 𝑍)
26	23, 25	eqeltrd 2834	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ ¬ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
27	21, 26	pm2.61dan 812	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
28	27	3adant3 1133	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
29		nfv 1918	. . . . . . . . . . . 12 ⊢ Ⅎ𝑗𝜑
30		nfv 1918	. . . . . . . . . . . 12 ⊢ Ⅎ𝑗 𝑖 ∈ ℝ
31		nfra1 3282	. . . . . . . . . . . 12 ⊢ Ⅎ𝑗∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)
32	29, 30, 31	nf3an 1905	. . . . . . . . . . 11 ⊢ Ⅎ𝑗(𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
33		simplr 768	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ∈ ℝ)
34	4, 27	sselid 3980	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ ℝ)
35	34	adantr 482	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ ℝ)
36		eluzelre 12830	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → 𝑗 ∈ ℝ)
37	36	adantl 483	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ ℝ)
38		simpr 486	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑖 ∈ ℝ)
39	17	zred 12663	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑖 ∈ ℝ → (⌈‘𝑖) ∈ ℝ)
40	39	adantl 483	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → (⌈‘𝑖) ∈ ℝ)
41		ceilge 13807	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑖 ∈ ℝ → 𝑖 ≤ (⌈‘𝑖))
42	41	adantl 483	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑖 ≤ (⌈‘𝑖))
43	4, 24	sselid 3980	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → 𝑀 ∈ ℝ)
44	43	adantr 482	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑀 ∈ ℝ)
45		max2 13163	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℝ ∧ (⌈‘𝑖) ∈ ℝ) → (⌈‘𝑖) ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
46	44, 40, 45	syl2anc 585	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → (⌈‘𝑖) ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
47	38, 40, 34, 42, 46	letrd 11368	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑖 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
48	47	adantr 482	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
49		eluzle 12832	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ≤ 𝑗)
50	49	adantl 483	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ≤ 𝑗)
51	33, 35, 37, 48, 50	letrd 11368	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ≤ 𝑗)
52	51	3adantl3 1169	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ≤ 𝑗)
53		simpl3 1194	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
54	15	ad2antrr 725	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ∈ ℤ)
55		eluzelz 12829	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → 𝑗 ∈ ℤ)
56	55	adantl 483	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ ℤ)
57	44	adantr 482	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ∈ ℝ)
58		max1 13161	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑀 ∈ ℝ ∧ (⌈‘𝑖) ∈ ℝ) → 𝑀 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
59	43, 39, 58	syl2an 597	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑀 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
60	59	adantr 482	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
61	57, 35, 37, 60, 50	letrd 11368	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ≤ 𝑗)
62	2, 54, 56, 61	eluzd 44106	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ 𝑍)
63	62	3adantl3 1169	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ 𝑍)
64		rspa 3246	. . . . . . . . . . . . . 14 ⊢ ((∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍) → (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
65	53, 63, 64	syl2anc 585	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
66	52, 65	mpd 15	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → (𝐹‘𝑗) ≤ 𝑥)
67	66	ex 414	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → (𝐹‘𝑗) ≤ 𝑥))
68	32, 67	ralrimi 3255	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∀𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))(𝐹‘𝑗) ≤ 𝑥)
69		fveq2 6889	. . . . . . . . . . . 12 ⊢ (𝑘 = if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) → (ℤ_≥‘𝑘) = (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)))
70	69	raleqdv 3326	. . . . . . . . . . 11 ⊢ (𝑘 = if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) → (∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 ↔ ∀𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))(𝐹‘𝑗) ≤ 𝑥))
71	70	rspcev 3613	. . . . . . . . . 10 ⊢ ((if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))(𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
72	28, 68, 71	syl2anc 585	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
73	72	3exp 1120	. . . . . . . 8 ⊢ (𝜑 → (𝑖 ∈ ℝ → (∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)))
74	73	rexlimdv 3154	. . . . . . 7 ⊢ (𝜑 → (∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
75	74	imp 408	. . . . . 6 ⊢ ((𝜑 ∧ ∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
76	12, 75	sylan2 594	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
77	76	ex 414	. . . 4 ⊢ (𝜑 → (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
78		rexss 4055	. . . . . . . 8 ⊢ (𝑍 ⊆ ℝ → (∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 ↔ ∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)))
79	4, 78	ax-mp 5	. . . . . . 7 ⊢ (∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 ↔ ∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
80	79	biimpi 215	. . . . . 6 ⊢ (∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 → ∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
81		nfv 1918	. . . . . . . . . . 11 ⊢ Ⅎ𝑗 𝑘 ∈ 𝑍
82		nfra1 3282	. . . . . . . . . . 11 ⊢ Ⅎ𝑗∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥
83	81, 82	nfan 1903	. . . . . . . . . 10 ⊢ Ⅎ𝑗(𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
84		simp1r 1199	. . . . . . . . . . . 12 ⊢ (((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
85		eqid 2733	. . . . . . . . . . . . . 14 ⊢ (ℤ_≥‘𝑘) = (ℤ_≥‘𝑘)
86	2	eluzelz2 44100	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ 𝑍 → 𝑘 ∈ ℤ)
87	86	3ad2ant1 1134	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑘 ∈ ℤ)
88	2	eluzelz2 44100	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ 𝑍 → 𝑗 ∈ ℤ)
89	88	3ad2ant2 1135	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑗 ∈ ℤ)
90		simp3 1139	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑘 ≤ 𝑗)
91	85, 87, 89, 90	eluzd 44106	. . . . . . . . . . . . 13 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑗 ∈ (ℤ_≥‘𝑘))
92	91	3adant1r 1178	. . . . . . . . . . . 12 ⊢ (((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑗 ∈ (ℤ_≥‘𝑘))
93		rspa 3246	. . . . . . . . . . . 12 ⊢ ((∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 ∧ 𝑗 ∈ (ℤ_≥‘𝑘)) → (𝐹‘𝑗) ≤ 𝑥)
94	84, 92, 93	syl2anc 585	. . . . . . . . . . 11 ⊢ (((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → (𝐹‘𝑗) ≤ 𝑥)
95	94	3exp 1120	. . . . . . . . . 10 ⊢ ((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → (𝑗 ∈ 𝑍 → (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
96	83, 95	ralrimi 3255	. . . . . . . . 9 ⊢ ((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
97	96	a1i 11	. . . . . . . 8 ⊢ (𝜑 → ((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
98	97	reximdv 3171	. . . . . . 7 ⊢ (𝜑 → (∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
99	98	imp 408	. . . . . 6 ⊢ ((𝜑 ∧ ∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
100	80, 99	sylan2 594	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
101	100	ex 414	. . . 4 ⊢ (𝜑 → (∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
102	77, 101	impbid 211	. . 3 ⊢ (𝜑 → (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
103	102	ralbidv 3178	. 2 ⊢ (𝜑 → (∀𝑥 ∈ ℝ ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
104	7, 103	bitrd 279	1 ⊢ (𝜑 → ((lim sup‘𝐹) = -∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(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 ⊆ wss 3948 ifcif 4528 class class class wbr 5148 ⟶wf 6537 ‘cfv 6541 ℝcr 11106 -∞cmnf 11243 ℝ^*cxr 11244 ≤ cle 11246 ℤcz 12555 ℤ_≥cuz 12819 ⌈cceil 13753 lim supclsp 15411

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-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184 ax-pre-sup 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-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-om 7853 df-2nd 7973 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-er 8700 df-en 8937 df-dom 8938 df-sdom 8939 df-sup 9434 df-inf 9435 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-nn 12210 df-n0 12470 df-z 12556 df-uz 12820 df-ico 13327 df-fl 13754 df-ceil 13755 df-limsup 15412

This theorem is referenced by: limsupmnfuz 44430

W3C validator