stirlinglem13 - Mathbox for Glauco Siliprandi

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Theorem stirlinglem13 44789

Description: 𝐵 is decreasing and has a lower bound, then it converges. Since 𝐵 is log𝐴, in another theorem it is proven that 𝐴 converges as well. (Contributed by Glauco Siliprandi, 29-Jun-2017.)

**Hypotheses**
Ref	Expression
stirlinglem13.1	⊢ 𝐴 = (𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛))))
stirlinglem13.2	⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (log‘(𝐴‘𝑛)))

**Assertion**
Ref	Expression
stirlinglem13	⊢ ∃𝑑 ∈ ℝ 𝐵 ⇝ 𝑑

Distinct variable group: 𝐵,𝑑 Allowed substitution hints: 𝐴(𝑛,𝑑) 𝐵(𝑛)

Proof of Theorem stirlinglem13 Dummy variables 𝑗 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		vex 3479	. . . . . 6 ⊢ 𝑦 ∈ V
2		stirlinglem13.2	. . . . . . 7 ⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (log‘(𝐴‘𝑛)))
3	2	elrnmpt 5954	. . . . . 6 ⊢ (𝑦 ∈ V → (𝑦 ∈ ran 𝐵 ↔ ∃𝑛 ∈ ℕ 𝑦 = (log‘(𝐴‘𝑛))))
4	1, 3	ax-mp 5	. . . . 5 ⊢ (𝑦 ∈ ran 𝐵 ↔ ∃𝑛 ∈ ℕ 𝑦 = (log‘(𝐴‘𝑛)))
5		simpr 486	. . . . . . 7 ⊢ ((𝑛 ∈ ℕ ∧ 𝑦 = (log‘(𝐴‘𝑛))) → 𝑦 = (log‘(𝐴‘𝑛)))
6		stirlinglem13.1	. . . . . . . . . 10 ⊢ 𝐴 = (𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛))))
7	6	stirlinglem2 44778	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (𝐴‘𝑛) ∈ ℝ⁺)
8	7	relogcld 26123	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ → (log‘(𝐴‘𝑛)) ∈ ℝ)
9	8	adantr 482	. . . . . . 7 ⊢ ((𝑛 ∈ ℕ ∧ 𝑦 = (log‘(𝐴‘𝑛))) → (log‘(𝐴‘𝑛)) ∈ ℝ)
10	5, 9	eqeltrd 2834	. . . . . 6 ⊢ ((𝑛 ∈ ℕ ∧ 𝑦 = (log‘(𝐴‘𝑛))) → 𝑦 ∈ ℝ)
11	10	rexlimiva 3148	. . . . 5 ⊢ (∃𝑛 ∈ ℕ 𝑦 = (log‘(𝐴‘𝑛)) → 𝑦 ∈ ℝ)
12	4, 11	sylbi 216	. . . 4 ⊢ (𝑦 ∈ ran 𝐵 → 𝑦 ∈ ℝ)
13	12	ssriv 3986	. . 3 ⊢ ran 𝐵 ⊆ ℝ
14		1nn 12220	. . . . . 6 ⊢ 1 ∈ ℕ
15	6	stirlinglem2 44778	. . . . . . . 8 ⊢ (1 ∈ ℕ → (𝐴‘1) ∈ ℝ⁺)
16		relogcl 26076	. . . . . . . 8 ⊢ ((𝐴‘1) ∈ ℝ⁺ → (log‘(𝐴‘1)) ∈ ℝ)
17	14, 15, 16	mp2b 10	. . . . . . 7 ⊢ (log‘(𝐴‘1)) ∈ ℝ
18		nfcv 2904	. . . . . . . 8 ⊢ Ⅎ𝑛1
19		nfcv 2904	. . . . . . . . 9 ⊢ Ⅎ𝑛log
20		nfmpt1 5256	. . . . . . . . . . 11 ⊢ Ⅎ𝑛(𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛))))
21	6, 20	nfcxfr 2902	. . . . . . . . . 10 ⊢ Ⅎ𝑛𝐴
22	21, 18	nffv 6899	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝐴‘1)
23	19, 22	nffv 6899	. . . . . . . 8 ⊢ Ⅎ𝑛(log‘(𝐴‘1))
24		2fveq3 6894	. . . . . . . 8 ⊢ (𝑛 = 1 → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘1)))
25	18, 23, 24, 2	fvmptf 7017	. . . . . . 7 ⊢ ((1 ∈ ℕ ∧ (log‘(𝐴‘1)) ∈ ℝ) → (𝐵‘1) = (log‘(𝐴‘1)))
26	14, 17, 25	mp2an 691	. . . . . 6 ⊢ (𝐵‘1) = (log‘(𝐴‘1))
27		2fveq3 6894	. . . . . . 7 ⊢ (𝑗 = 1 → (log‘(𝐴‘𝑗)) = (log‘(𝐴‘1)))
28	27	rspceeqv 3633	. . . . . 6 ⊢ ((1 ∈ ℕ ∧ (𝐵‘1) = (log‘(𝐴‘1))) → ∃𝑗 ∈ ℕ (𝐵‘1) = (log‘(𝐴‘𝑗)))
29	14, 26, 28	mp2an 691	. . . . 5 ⊢ ∃𝑗 ∈ ℕ (𝐵‘1) = (log‘(𝐴‘𝑗))
30	26, 17	eqeltri 2830	. . . . . 6 ⊢ (𝐵‘1) ∈ ℝ
31		nfcv 2904	. . . . . . . . 9 ⊢ Ⅎ𝑗(log‘(𝐴‘𝑛))
32		nfcv 2904	. . . . . . . . . . 11 ⊢ Ⅎ𝑛𝑗
33	21, 32	nffv 6899	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐴‘𝑗)
34	19, 33	nffv 6899	. . . . . . . . 9 ⊢ Ⅎ𝑛(log‘(𝐴‘𝑗))
35		2fveq3 6894	. . . . . . . . 9 ⊢ (𝑛 = 𝑗 → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘𝑗)))
36	31, 34, 35	cbvmpt 5259	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ ↦ (log‘(𝐴‘𝑛))) = (𝑗 ∈ ℕ ↦ (log‘(𝐴‘𝑗)))
37	2, 36	eqtri 2761	. . . . . . 7 ⊢ 𝐵 = (𝑗 ∈ ℕ ↦ (log‘(𝐴‘𝑗)))
38	37	elrnmpt 5954	. . . . . 6 ⊢ ((𝐵‘1) ∈ ℝ → ((𝐵‘1) ∈ ran 𝐵 ↔ ∃𝑗 ∈ ℕ (𝐵‘1) = (log‘(𝐴‘𝑗))))
39	30, 38	ax-mp 5	. . . . 5 ⊢ ((𝐵‘1) ∈ ran 𝐵 ↔ ∃𝑗 ∈ ℕ (𝐵‘1) = (log‘(𝐴‘𝑗)))
40	29, 39	mpbir 230	. . . 4 ⊢ (𝐵‘1) ∈ ran 𝐵
41	40	ne0ii 4337	. . 3 ⊢ ran 𝐵 ≠ ∅
42		4re 12293	. . . . . . 7 ⊢ 4 ∈ ℝ
43		4ne0 12317	. . . . . . 7 ⊢ 4 ≠ 0
44	42, 43	rereccli 11976	. . . . . 6 ⊢ (1 / 4) ∈ ℝ
45	30, 44	resubcli 11519	. . . . 5 ⊢ ((𝐵‘1) − (1 / 4)) ∈ ℝ
46		eqid 2733	. . . . . . 7 ⊢ (𝑛 ∈ ℕ ↦ (1 / (𝑛 · (𝑛 + 1)))) = (𝑛 ∈ ℕ ↦ (1 / (𝑛 · (𝑛 + 1))))
47	6, 2, 46	stirlinglem12 44788	. . . . . 6 ⊢ (𝑗 ∈ ℕ → ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗))
48	47	rgen 3064	. . . . 5 ⊢ ∀𝑗 ∈ ℕ ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗)
49		breq1 5151	. . . . . . 7 ⊢ (𝑥 = ((𝐵‘1) − (1 / 4)) → (𝑥 ≤ (𝐵‘𝑗) ↔ ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗)))
50	49	ralbidv 3178	. . . . . 6 ⊢ (𝑥 = ((𝐵‘1) − (1 / 4)) → (∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ↔ ∀𝑗 ∈ ℕ ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗)))
51	50	rspcev 3613	. . . . 5 ⊢ ((((𝐵‘1) − (1 / 4)) ∈ ℝ ∧ ∀𝑗 ∈ ℕ ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗)) → ∃𝑥 ∈ ℝ ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗))
52	45, 48, 51	mp2an 691	. . . 4 ⊢ ∃𝑥 ∈ ℝ ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗)
53		simpr 486	. . . . . . . 8 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → 𝑦 ∈ ran 𝐵)
54	8	rgen 3064	. . . . . . . . 9 ⊢ ∀𝑛 ∈ ℕ (log‘(𝐴‘𝑛)) ∈ ℝ
55	2	fnmpt 6688	. . . . . . . . 9 ⊢ (∀𝑛 ∈ ℕ (log‘(𝐴‘𝑛)) ∈ ℝ → 𝐵 Fn ℕ)
56		fvelrnb 6950	. . . . . . . . 9 ⊢ (𝐵 Fn ℕ → (𝑦 ∈ ran 𝐵 ↔ ∃𝑗 ∈ ℕ (𝐵‘𝑗) = 𝑦))
57	54, 55, 56	mp2b 10	. . . . . . . 8 ⊢ (𝑦 ∈ ran 𝐵 ↔ ∃𝑗 ∈ ℕ (𝐵‘𝑗) = 𝑦)
58	53, 57	sylib 217	. . . . . . 7 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → ∃𝑗 ∈ ℕ (𝐵‘𝑗) = 𝑦)
59		nfra1 3282	. . . . . . . . 9 ⊢ Ⅎ𝑗∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗)
60		nfv 1918	. . . . . . . . 9 ⊢ Ⅎ𝑗 𝑦 ∈ ran 𝐵
61	59, 60	nfan 1903	. . . . . . . 8 ⊢ Ⅎ𝑗(∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵)
62		nfv 1918	. . . . . . . 8 ⊢ Ⅎ𝑗 𝑥 ≤ 𝑦
63		simp1l 1198	. . . . . . . . . . 11 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗))
64		simp2 1138	. . . . . . . . . . 11 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → 𝑗 ∈ ℕ)
65		rsp 3245	. . . . . . . . . . 11 ⊢ (∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) → (𝑗 ∈ ℕ → 𝑥 ≤ (𝐵‘𝑗)))
66	63, 64, 65	sylc 65	. . . . . . . . . 10 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → 𝑥 ≤ (𝐵‘𝑗))
67		simp3 1139	. . . . . . . . . 10 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → (𝐵‘𝑗) = 𝑦)
68	66, 67	breqtrd 5174	. . . . . . . . 9 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → 𝑥 ≤ 𝑦)
69	68	3exp 1120	. . . . . . . 8 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → (𝑗 ∈ ℕ → ((𝐵‘𝑗) = 𝑦 → 𝑥 ≤ 𝑦)))
70	61, 62, 69	rexlimd 3264	. . . . . . 7 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → (∃𝑗 ∈ ℕ (𝐵‘𝑗) = 𝑦 → 𝑥 ≤ 𝑦))
71	58, 70	mpd 15	. . . . . 6 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → 𝑥 ≤ 𝑦)
72	71	ralrimiva 3147	. . . . 5 ⊢ (∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) → ∀𝑦 ∈ ran 𝐵 𝑥 ≤ 𝑦)
73	72	reximi 3085	. . . 4 ⊢ (∃𝑥 ∈ ℝ ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ran 𝐵 𝑥 ≤ 𝑦)
74	52, 73	ax-mp 5	. . 3 ⊢ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ran 𝐵 𝑥 ≤ 𝑦
75		infrecl 12193	. . 3 ⊢ ((ran 𝐵 ⊆ ℝ ∧ ran 𝐵 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ran 𝐵 𝑥 ≤ 𝑦) → inf(ran 𝐵, ℝ, < ) ∈ ℝ)
76	13, 41, 74, 75	mp3an 1462	. 2 ⊢ inf(ran 𝐵, ℝ, < ) ∈ ℝ
77		nnuz 12862	. . . 4 ⊢ ℕ = (ℤ_≥‘1)
78		1zzd 12590	. . . 4 ⊢ (⊤ → 1 ∈ ℤ)
79	2, 8	fmpti 7109	. . . . 5 ⊢ 𝐵:ℕ⟶ℝ
80	79	a1i 11	. . . 4 ⊢ (⊤ → 𝐵:ℕ⟶ℝ)
81		peano2nn 12221	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ)
82	6	a1i 11	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → 𝐴 = (𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛)))))
83		simpr 486	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → 𝑛 = (𝑗 + 1))
84	83	fveq2d 6893	. . . . . . . . . . . 12 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (!‘𝑛) = (!‘(𝑗 + 1)))
85	83	oveq2d 7422	. . . . . . . . . . . . . 14 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (2 · 𝑛) = (2 · (𝑗 + 1)))
86	85	fveq2d 6893	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (√‘(2 · 𝑛)) = (√‘(2 · (𝑗 + 1))))
87	83	oveq1d 7421	. . . . . . . . . . . . . 14 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (𝑛 / e) = ((𝑗 + 1) / e))
88	87, 83	oveq12d 7424	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((𝑛 / e)↑𝑛) = (((𝑗 + 1) / e)↑(𝑗 + 1)))
89	86, 88	oveq12d 7424	. . . . . . . . . . . 12 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛)) = ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))))
90	84, 89	oveq12d 7424	. . . . . . . . . . 11 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛))) = ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))))
91	81	nnnn0d 12529	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ₀)
92		faccl 14240	. . . . . . . . . . . . 13 ⊢ ((𝑗 + 1) ∈ ℕ₀ → (!‘(𝑗 + 1)) ∈ ℕ)
93		nncn 12217	. . . . . . . . . . . . 13 ⊢ ((!‘(𝑗 + 1)) ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℂ)
94	91, 92, 93	3syl 18	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℂ)
95		2cnd 12287	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → 2 ∈ ℂ)
96		nncn 12217	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℂ)
97		1cnd 11206	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 1 ∈ ℂ)
98	96, 97	addcld 11230	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℂ)
99	95, 98	mulcld 11231	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → (2 · (𝑗 + 1)) ∈ ℂ)
100	99	sqrtcld 15381	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ∈ ℂ)
101		ere 16029	. . . . . . . . . . . . . . . . 17 ⊢ e ∈ ℝ
102	101	recni 11225	. . . . . . . . . . . . . . . 16 ⊢ e ∈ ℂ
103	102	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → e ∈ ℂ)
104		0re 11213	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
105		epos 16147	. . . . . . . . . . . . . . . . 17 ⊢ 0 < e
106	104, 105	gtneii 11323	. . . . . . . . . . . . . . . 16 ⊢ e ≠ 0
107	106	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → e ≠ 0)
108	98, 103, 107	divcld 11987	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ∈ ℂ)
109	108, 91	expcld 14108	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ∈ ℂ)
110	100, 109	mulcld 11231	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ∈ ℂ)
111		2rp 12976	. . . . . . . . . . . . . . . . 17 ⊢ 2 ∈ ℝ⁺
112	111	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 2 ∈ ℝ⁺)
113		nnre 12216	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℝ)
114	104	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 0 ∈ ℝ)
115		1red 11212	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 1 ∈ ℝ)
116		0le1 11734	. . . . . . . . . . . . . . . . . . 19 ⊢ 0 ≤ 1
117	116	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 0 ≤ 1)
118		nnge1 12237	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 1 ≤ 𝑗)
119	114, 115, 113, 117, 118	letrd 11368	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ ℕ → 0 ≤ 𝑗)
120	113, 119	ge0p1rpd 13043	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℝ⁺)
121	112, 120	rpmulcld 13029	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (2 · (𝑗 + 1)) ∈ ℝ⁺)
122	121	sqrtgt0d 15356	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → 0 < (√‘(2 · (𝑗 + 1))))
123	122	gt0ne0d 11775	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ≠ 0)
124	81	nnne0d 12259	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ≠ 0)
125	98, 103, 124, 107	divne0d 12003	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ≠ 0)
126		nnz 12576	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℤ)
127	126	peano2zd 12666	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℤ)
128	108, 125, 127	expne0d 14114	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ≠ 0)
129	100, 109, 123, 128	mulne0d 11863	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ≠ 0)
130	94, 110, 129	divcld 11987	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))) ∈ ℂ)
131	82, 90, 81, 130	fvmptd 7003	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → (𝐴‘(𝑗 + 1)) = ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))))
132		nnrp 12982	. . . . . . . . . . . 12 ⊢ ((!‘(𝑗 + 1)) ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℝ⁺)
133	91, 92, 132	3syl 18	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℝ⁺)
134	121	rpsqrtcld 15355	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ∈ ℝ⁺)
135		epr 16148	. . . . . . . . . . . . . . 15 ⊢ e ∈ ℝ⁺
136	135	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → e ∈ ℝ⁺)
137	120, 136	rpdivcld 13030	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ∈ ℝ⁺)
138	137, 127	rpexpcld 14207	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ∈ ℝ⁺)
139	134, 138	rpmulcld 13029	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ∈ ℝ⁺)
140	133, 139	rpdivcld 13030	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))) ∈ ℝ⁺)
141	131, 140	eqeltrd 2834	. . . . . . . . 9 ⊢ (𝑗 ∈ ℕ → (𝐴‘(𝑗 + 1)) ∈ ℝ⁺)
142	141	relogcld 26123	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → (log‘(𝐴‘(𝑗 + 1))) ∈ ℝ)
143		nfcv 2904	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝑗 + 1)
144	21, 143	nffv 6899	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐴‘(𝑗 + 1))
145	19, 144	nffv 6899	. . . . . . . . 9 ⊢ Ⅎ𝑛(log‘(𝐴‘(𝑗 + 1)))
146		2fveq3 6894	. . . . . . . . 9 ⊢ (𝑛 = (𝑗 + 1) → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘(𝑗 + 1))))
147	143, 145, 146, 2	fvmptf 7017	. . . . . . . 8 ⊢ (((𝑗 + 1) ∈ ℕ ∧ (log‘(𝐴‘(𝑗 + 1))) ∈ ℝ) → (𝐵‘(𝑗 + 1)) = (log‘(𝐴‘(𝑗 + 1))))
148	81, 142, 147	syl2anc 585	. . . . . . 7 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) = (log‘(𝐴‘(𝑗 + 1))))
149	148, 142	eqeltrd 2834	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) ∈ ℝ)
150	79	ffvelcdmi 7083	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘𝑗) ∈ ℝ)
151		eqid 2733	. . . . . . 7 ⊢ (𝑧 ∈ ℕ ↦ ((1 / ((2 · 𝑧) + 1)) · ((1 / ((2 · 𝑗) + 1))↑(2 · 𝑧)))) = (𝑧 ∈ ℕ ↦ ((1 / ((2 · 𝑧) + 1)) · ((1 / ((2 · 𝑗) + 1))↑(2 · 𝑧))))
152	6, 2, 151	stirlinglem11 44787	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) < (𝐵‘𝑗))
153	149, 150, 152	ltled 11359	. . . . 5 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) ≤ (𝐵‘𝑗))
154	153	adantl 483	. . . 4 ⊢ ((⊤ ∧ 𝑗 ∈ ℕ) → (𝐵‘(𝑗 + 1)) ≤ (𝐵‘𝑗))
155	52	a1i 11	. . . 4 ⊢ (⊤ → ∃𝑥 ∈ ℝ ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗))
156	77, 78, 80, 154, 155	climinf 44309	. . 3 ⊢ (⊤ → 𝐵 ⇝ inf(ran 𝐵, ℝ, < ))
157	156	mptru 1549	. 2 ⊢ 𝐵 ⇝ inf(ran 𝐵, ℝ, < )
158		breq2 5152	. . 3 ⊢ (𝑑 = inf(ran 𝐵, ℝ, < ) → (𝐵 ⇝ 𝑑 ↔ 𝐵 ⇝ inf(ran 𝐵, ℝ, < )))
159	158	rspcev 3613	. 2 ⊢ ((inf(ran 𝐵, ℝ, < ) ∈ ℝ ∧ 𝐵 ⇝ inf(ran 𝐵, ℝ, < )) → ∃𝑑 ∈ ℝ 𝐵 ⇝ 𝑑)
160	76, 157, 159	mp2an 691	1 ⊢ ∃𝑑 ∈ ℝ 𝐵 ⇝ 𝑑

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ⊤wtru 1543 ∈ wcel 2107 ≠ wne 2941 ∀wral 3062 ∃wrex 3071 Vcvv 3475 ⊆ wss 3948 ∅c0 4322 class class class wbr 5148 ↦ cmpt 5231 ran crn 5677 Fn wfn 6536 ⟶wf 6537 ‘cfv 6541 (class class class)co 7406 infcinf 9433 ℂcc 11105 ℝcr 11106 0cc0 11107 1c1 11108 + caddc 11110 · cmul 11112 < clt 11245 ≤ cle 11246 − cmin 11441 / cdiv 11868 ℕcn 12209 2c2 12264 4c4 12266 ℕ₀cn0 12469 ℝ⁺crp 12971 ↑cexp 14024 !cfa 14230 √csqrt 15177 ⇝ cli 15425 eceu 16003 logclog 26055

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-inf2 9633 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 ax-addf 11186 ax-mulf 11187

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-tp 4633 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-iin 5000 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-se 5632 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-isom 6550 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-of 7667 df-om 7853 df-1st 7972 df-2nd 7973 df-supp 8144 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-2o 8464 df-oadd 8467 df-er 8700 df-map 8819 df-pm 8820 df-ixp 8889 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-fsupp 9359 df-fi 9403 df-sup 9434 df-inf 9435 df-oi 9502 df-card 9931 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-div 11869 df-nn 12210 df-2 12272 df-3 12273 df-4 12274 df-5 12275 df-6 12276 df-7 12277 df-8 12278 df-9 12279 df-n0 12470 df-xnn0 12542 df-z 12556 df-dec 12675 df-uz 12820 df-q 12930 df-rp 12972 df-xneg 13089 df-xadd 13090 df-xmul 13091 df-ioo 13325 df-ioc 13326 df-ico 13327 df-icc 13328 df-fz 13482 df-fzo 13625 df-fl 13754 df-mod 13832 df-seq 13964 df-exp 14025 df-fac 14231 df-bc 14260 df-hash 14288 df-shft 15011 df-cj 15043 df-re 15044 df-im 15045 df-sqrt 15179 df-abs 15180 df-limsup 15412 df-clim 15429 df-rlim 15430 df-sum 15630 df-ef 16008 df-e 16009 df-sin 16010 df-cos 16011 df-tan 16012 df-pi 16013 df-dvds 16195 df-struct 17077 df-sets 17094 df-slot 17112 df-ndx 17124 df-base 17142 df-ress 17171 df-plusg 17207 df-mulr 17208 df-starv 17209 df-sca 17210 df-vsca 17211 df-ip 17212 df-tset 17213 df-ple 17214 df-ds 17216 df-unif 17217 df-hom 17218 df-cco 17219 df-rest 17365 df-topn 17366 df-0g 17384 df-gsum 17385 df-topgen 17386 df-pt 17387 df-prds 17390 df-xrs 17445 df-qtop 17450 df-imas 17451 df-xps 17453 df-mre 17527 df-mrc 17528 df-acs 17530 df-mgm 18558 df-sgrp 18607 df-mnd 18623 df-submnd 18669 df-mulg 18946 df-cntz 19176 df-cmn 19645 df-psmet 20929 df-xmet 20930 df-met 20931 df-bl 20932 df-mopn 20933 df-fbas 20934 df-fg 20935 df-cnfld 20938 df-top 22388 df-topon 22405 df-topsp 22427 df-bases 22441 df-cld 22515 df-ntr 22516 df-cls 22517 df-nei 22594 df-lp 22632 df-perf 22633 df-cn 22723 df-cnp 22724 df-haus 22811 df-cmp 22883 df-tx 23058 df-hmeo 23251 df-fil 23342 df-fm 23434 df-flim 23435 df-flf 23436 df-xms 23818 df-ms 23819 df-tms 23820 df-cncf 24386 df-limc 25375 df-dv 25376 df-ulm 25881 df-log 26057 df-cxp 26058

This theorem is referenced by: stirlinglem14 44790

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