limsupmnfuzlem - Mathbox for Glauco Siliprandi

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Theorem limsupmnfuzlem 46555

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 2922	. . 3 ⊢ Ⅎ𝑗𝐹
2		limsupmnfuzlem.2	. . . . 5 ⊢ 𝑍 = (ℤ_≥‘𝑀)
3		uzssre 12910	. . . . 5 ⊢ (ℤ_≥‘𝑀) ⊆ ℝ
4	2, 3	eqsstri 3977	. . . 4 ⊢ 𝑍 ⊆ ℝ
5	4	a1i 11	. . 3 ⊢ (𝜑 → 𝑍 ⊆ ℝ)
6		limsupmnfuzlem.3	. . 3 ⊢ (𝜑 → 𝐹:𝑍⟶ℝ^*)
7	1, 5, 6	limsupmnf 46550	. 2 ⊢ (𝜑 → ((lim sup‘𝐹) = -∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
8		breq1 5106	. . . . . . . . . 10 ⊢ (𝑘 = 𝑖 → (𝑘 ≤ 𝑗 ↔ 𝑖 ≤ 𝑗))
9	8	imbi1d 344	. . . . . . . . 9 ⊢ (𝑘 = 𝑖 → ((𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
10	9	ralbidv 3185	. . . . . . . 8 ⊢ (𝑘 = 𝑖 → (∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
11	10	cbvrexvw 3241	. . . . . . 7 ⊢ (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
12	11	biimpi 219	. . . . . 6 ⊢ (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
13		iftrue 4488	. . . . . . . . . . . . . 14 ⊢ (𝑀 ≤ (⌈‘𝑖) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = (⌈‘𝑖))
14	13	adantl 487	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = (⌈‘𝑖))
15		limsupmnfuzlem.1	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → 𝑀 ∈ ℤ)
16	15	ad2antrr 739	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → 𝑀 ∈ ℤ)
17		ceilcl 13904	. . . . . . . . . . . . . . 15 ⊢ (𝑖 ∈ ℝ → (⌈‘𝑖) ∈ ℤ)
18	17	ad2antlr 740	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → (⌈‘𝑖) ∈ ℤ)
19		simpr 490	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → 𝑀 ≤ (⌈‘𝑖))
20	2, 16, 18, 19	eluzd 46238	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → (⌈‘𝑖) ∈ 𝑍)
21	14, 20	eqeltrd 2860	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
22		iffalse 4491	. . . . . . . . . . . . . 14 ⊢ (¬ 𝑀 ≤ (⌈‘𝑖) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = 𝑀)
23	22	adantl 487	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ ¬ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) = 𝑀)
24	15, 2	uzidd2 46245	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑀 ∈ 𝑍)
25	24	ad2antrr 739	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ ¬ 𝑀 ≤ (⌈‘𝑖)) → 𝑀 ∈ 𝑍)
26	23, 25	eqeltrd 2860	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ ¬ 𝑀 ≤ (⌈‘𝑖)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
27	21, 26	pm2.61dan 825	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
28	27	3adant3 1150	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ 𝑍)
29		nfv 1947	. . . . . . . . . . . 12 ⊢ Ⅎ𝑗𝜑
30		nfv 1947	. . . . . . . . . . . 12 ⊢ Ⅎ𝑗 𝑖 ∈ ℝ
31		nfra1 3286	. . . . . . . . . . . 12 ⊢ Ⅎ𝑗∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)
32	29, 30, 31	nf3an 1934	. . . . . . . . . . 11 ⊢ Ⅎ𝑗(𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
33		simplr 781	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ∈ ℝ)
34	4, 27	sselid 3929	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ ℝ)
35	34	adantr 486	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ∈ ℝ)
36		eluzelre 12899	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → 𝑗 ∈ ℝ)
37	36	adantl 487	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ ℝ)
38		simpr 490	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑖 ∈ ℝ)
39	17	zred 12726	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑖 ∈ ℝ → (⌈‘𝑖) ∈ ℝ)
40	39	adantl 487	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → (⌈‘𝑖) ∈ ℝ)
41		ceilge 13907	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑖 ∈ ℝ → 𝑖 ≤ (⌈‘𝑖))
42	41	adantl 487	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑖 ≤ (⌈‘𝑖))
43	4, 24	sselid 3929	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝜑 → 𝑀 ∈ ℝ)
44	43	adantr 486	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑀 ∈ ℝ)
45		max2 13240	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑀 ∈ ℝ ∧ (⌈‘𝑖) ∈ ℝ) → (⌈‘𝑖) ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
46	44, 40, 45	syl2anc 596	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → (⌈‘𝑖) ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
47	38, 40, 34, 42, 46	letrd 11392	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑖 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
48	47	adantr 486	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
49		eluzle 12901	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ≤ 𝑗)
50	49	adantl 487	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) ≤ 𝑗)
51	33, 35, 37, 48, 50	letrd 11392	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ≤ 𝑗)
52	51	3adantl3 1187	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑖 ≤ 𝑗)
53		simpl3 1212	. . . . . . . . . . . . . 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 739	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ∈ ℤ)
55		eluzelz 12898	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)) → 𝑗 ∈ ℤ)
56	55	adantl 487	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ ℤ)
57	44	adantr 486	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ∈ ℝ)
58		max1 13238	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑀 ∈ ℝ ∧ (⌈‘𝑖) ∈ ℝ) → 𝑀 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
59	43, 39, 58	syl2an 608	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ) → 𝑀 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
60	59	adantr 486	. . . . . . . . . . . . . . . . 17 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ≤ if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))
61	57, 35, 37, 60, 50	letrd 11392	. . . . . . . . . . . . . . . 16 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑀 ≤ 𝑗)
62	2, 54, 56, 61	eluzd 46238	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ 𝑍)
63	62	3adantl3 1187	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → 𝑗 ∈ 𝑍)
64		rspa 3251	. . . . . . . . . . . . . 14 ⊢ ((∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍) → (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
65	53, 63, 64	syl2anc 596	. . . . . . . . . . . . 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 16	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) ∧ 𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))) → (𝐹‘𝑗) ≤ 𝑥)
67	66	ex 418	. . . . . . . . . . 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 3260	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∀𝑗 ∈ (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀))(𝐹‘𝑗) ≤ 𝑥)
69		fveq2 6879	. . . . . . . . . . . 12 ⊢ (𝑘 = if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀) → (ℤ_≥‘𝑘) = (ℤ_≥‘if(𝑀 ≤ (⌈‘𝑖), (⌈‘𝑖), 𝑀)))
70	69	raleqdv 3319	. . . . . . . . . . 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 3576	. . . . . . . . . 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 596	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 ∈ ℝ ∧ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
73	72	3exp 1137	. . . . . . . 8 ⊢ (𝜑 → (𝑖 ∈ ℝ → (∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)))
74	73	rexlimdv 3161	. . . . . . 7 ⊢ (𝜑 → (∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
75	74	imp 412	. . . . . 6 ⊢ ((𝜑 ∧ ∃𝑖 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑖 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
76	12, 75	sylan2 605	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
77	76	ex 418	. . . 4 ⊢ (𝜑 → (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
78		rexss 4005	. . . . . . . 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 219	. . . . . 6 ⊢ (∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 → ∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
81		nfv 1947	. . . . . . . . . . 11 ⊢ Ⅎ𝑗 𝑘 ∈ 𝑍
82		nfra1 3286	. . . . . . . . . . 11 ⊢ Ⅎ𝑗∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥
83	81, 82	nfan 1932	. . . . . . . . . 10 ⊢ Ⅎ𝑗(𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
84		simp1r 1217	. . . . . . . . . . . 12 ⊢ (((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥)
85		eqid 2760	. . . . . . . . . . . . . 14 ⊢ (ℤ_≥‘𝑘) = (ℤ_≥‘𝑘)
86	2	eluzelz2 46232	. . . . . . . . . . . . . . 15 ⊢ (𝑘 ∈ 𝑍 → 𝑘 ∈ ℤ)
87	86	3ad2ant1 1151	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑘 ∈ ℤ)
88	2	eluzelz2 46232	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ 𝑍 → 𝑗 ∈ ℤ)
89	88	3ad2ant2 1152	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑗 ∈ ℤ)
90		simp3 1156	. . . . . . . . . . . . . 14 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑘 ≤ 𝑗)
91	85, 87, 89, 90	eluzd 46238	. . . . . . . . . . . . 13 ⊢ ((𝑘 ∈ 𝑍 ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑗 ∈ (ℤ_≥‘𝑘))
92	91	3adant1r 1196	. . . . . . . . . . . 12 ⊢ (((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → 𝑗 ∈ (ℤ_≥‘𝑘))
93		rspa 3251	. . . . . . . . . . . 12 ⊢ ((∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 ∧ 𝑗 ∈ (ℤ_≥‘𝑘)) → (𝐹‘𝑗) ≤ 𝑥)
94	84, 92, 93	syl2anc 596	. . . . . . . . . . 11 ⊢ (((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) ∧ 𝑗 ∈ 𝑍 ∧ 𝑘 ≤ 𝑗) → (𝐹‘𝑗) ≤ 𝑥)
95	94	3exp 1137	. . . . . . . . . 10 ⊢ ((𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → (𝑗 ∈ 𝑍 → (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
96	83, 95	ralrimi 3260	. . . . . . . . 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 3177	. . . . . . 7 ⊢ (𝜑 → (∃𝑘 ∈ ℝ (𝑘 ∈ 𝑍 ∧ ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
99	98	imp 412	. . . . . 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 605	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥) → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥))
101	100	ex 418	. . . 4 ⊢ (𝜑 → (∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥 → ∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥)))
102	77, 101	impbid 215	. . 3 ⊢ (𝜑 → (∃𝑘 ∈ ℝ ∀𝑗 ∈ 𝑍 (𝑘 ≤ 𝑗 → (𝐹‘𝑗) ≤ 𝑥) ↔ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))
103	102	ralbidv 3185	. 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 282	1 ⊢ (𝜑 → ((lim sup‘𝐹) = -∞ ↔ ∀𝑥 ∈ ℝ ∃𝑘 ∈ 𝑍 ∀𝑗 ∈ (ℤ_≥‘𝑘)(𝐹‘𝑗) ≤ 𝑥))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ∀wral 3076 ∃wrex 3086 ⊆ wss 3899 ifcif 4482 class class class wbr 5103 ⟶wf 6529 ‘cfv 6533 ℝcr 11124 -∞cmnf 11266 ℝ^*cxr 11267 ≤ cle 11269 ℤcz 12616 ℤ_≥cuz 12888 ⌈cceil 13853 lim supclsp 15558

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 ax-cnex 11181 ax-resscn 11182 ax-1cn 11183 ax-icn 11184 ax-addcl 11185 ax-addrcl 11186 ax-mulcl 11187 ax-mulrcl 11188 ax-mulcom 11189 ax-addass 11190 ax-mulass 11191 ax-distr 11192 ax-i2m1 11193 ax-1ne0 11194 ax-1rid 11195 ax-rnegex 11196 ax-rrecex 11197 ax-cnre 11198 ax-pre-lttri 11199 ax-pre-lttrn 11200 ax-pre-ltadd 11201 ax-pre-mulgt0 11202 ax-pre-sup 11203

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7864 df-2nd 7988 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-er 8697 df-en 8954 df-dom 8955 df-sdom 8956 df-sup 9413 df-inf 9414 df-pnf 11270 df-mnf 11271 df-xr 11272 df-ltxr 11273 df-le 11274 df-sub 11468 df-neg 11469 df-nn 12259 df-n0 12530 df-z 12617 df-uz 12889 df-ico 13405 df-fl 13854 df-ceil 13855 df-limsup 15559

This theorem is used by: limsupmnfuz 46556

W3C validator