stirlinglem13 - Mathbox for Glauco Siliprandi

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Theorem stirlinglem13 45101

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 3477	. . . . . 6 ⊢ 𝑦 ∈ V
2		stirlinglem13.2	. . . . . . 7 ⊢ 𝐵 = (𝑛 ∈ ℕ ↦ (log‘(𝐴‘𝑛)))
3	2	elrnmpt 5955	. . . . . 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 484	. . . . . . 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 45090	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (𝐴‘𝑛) ∈ ℝ⁺)
8	7	relogcld 26368	. . . . . . . 8 ⊢ (𝑛 ∈ ℕ → (log‘(𝐴‘𝑛)) ∈ ℝ)
9	8	adantr 480	. . . . . . 7 ⊢ ((𝑛 ∈ ℕ ∧ 𝑦 = (log‘(𝐴‘𝑛))) → (log‘(𝐴‘𝑛)) ∈ ℝ)
10	5, 9	eqeltrd 2832	. . . . . 6 ⊢ ((𝑛 ∈ ℕ ∧ 𝑦 = (log‘(𝐴‘𝑛))) → 𝑦 ∈ ℝ)
11	10	rexlimiva 3146	. . . . 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 12228	. . . . . 6 ⊢ 1 ∈ ℕ
15	6	stirlinglem2 45090	. . . . . . . 8 ⊢ (1 ∈ ℕ → (𝐴‘1) ∈ ℝ⁺)
16		relogcl 26321	. . . . . . . 8 ⊢ ((𝐴‘1) ∈ ℝ⁺ → (log‘(𝐴‘1)) ∈ ℝ)
17	14, 15, 16	mp2b 10	. . . . . . 7 ⊢ (log‘(𝐴‘1)) ∈ ℝ
18		nfcv 2902	. . . . . . . 8 ⊢ Ⅎ𝑛1
19		nfcv 2902	. . . . . . . . 9 ⊢ Ⅎ𝑛log
20		nfmpt1 5256	. . . . . . . . . . 11 ⊢ Ⅎ𝑛(𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛))))
21	6, 20	nfcxfr 2900	. . . . . . . . . 10 ⊢ Ⅎ𝑛𝐴
22	21, 18	nffv 6901	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝐴‘1)
23	19, 22	nffv 6901	. . . . . . . 8 ⊢ Ⅎ𝑛(log‘(𝐴‘1))
24		2fveq3 6896	. . . . . . . 8 ⊢ (𝑛 = 1 → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘1)))
25	18, 23, 24, 2	fvmptf 7019	. . . . . . 7 ⊢ ((1 ∈ ℕ ∧ (log‘(𝐴‘1)) ∈ ℝ) → (𝐵‘1) = (log‘(𝐴‘1)))
26	14, 17, 25	mp2an 689	. . . . . 6 ⊢ (𝐵‘1) = (log‘(𝐴‘1))
27		2fveq3 6896	. . . . . . 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 689	. . . . 5 ⊢ ∃𝑗 ∈ ℕ (𝐵‘1) = (log‘(𝐴‘𝑗))
30	26, 17	eqeltri 2828	. . . . . 6 ⊢ (𝐵‘1) ∈ ℝ
31		nfcv 2902	. . . . . . . . 9 ⊢ Ⅎ𝑗(log‘(𝐴‘𝑛))
32		nfcv 2902	. . . . . . . . . . 11 ⊢ Ⅎ𝑛𝑗
33	21, 32	nffv 6901	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐴‘𝑗)
34	19, 33	nffv 6901	. . . . . . . . 9 ⊢ Ⅎ𝑛(log‘(𝐴‘𝑗))
35		2fveq3 6896	. . . . . . . . 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 2759	. . . . . . 7 ⊢ 𝐵 = (𝑗 ∈ ℕ ↦ (log‘(𝐴‘𝑗)))
38	37	elrnmpt 5955	. . . . . 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 12301	. . . . . . 7 ⊢ 4 ∈ ℝ
43		4ne0 12325	. . . . . . 7 ⊢ 4 ≠ 0
44	42, 43	rereccli 11984	. . . . . 6 ⊢ (1 / 4) ∈ ℝ
45	30, 44	resubcli 11527	. . . . 5 ⊢ ((𝐵‘1) − (1 / 4)) ∈ ℝ
46		eqid 2731	. . . . . . 7 ⊢ (𝑛 ∈ ℕ ↦ (1 / (𝑛 · (𝑛 + 1)))) = (𝑛 ∈ ℕ ↦ (1 / (𝑛 · (𝑛 + 1))))
47	6, 2, 46	stirlinglem12 45100	. . . . . 6 ⊢ (𝑗 ∈ ℕ → ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗))
48	47	rgen 3062	. . . . 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 3176	. . . . . 6 ⊢ (𝑥 = ((𝐵‘1) − (1 / 4)) → (∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ↔ ∀𝑗 ∈ ℕ ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗)))
51	50	rspcev 3612	. . . . 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 689	. . . 4 ⊢ ∃𝑥 ∈ ℝ ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗)
53		simpr 484	. . . . . . . 8 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → 𝑦 ∈ ran 𝐵)
54	8	rgen 3062	. . . . . . . . 9 ⊢ ∀𝑛 ∈ ℕ (log‘(𝐴‘𝑛)) ∈ ℝ
55	2	fnmpt 6690	. . . . . . . . 9 ⊢ (∀𝑛 ∈ ℕ (log‘(𝐴‘𝑛)) ∈ ℝ → 𝐵 Fn ℕ)
56		fvelrnb 6952	. . . . . . . . 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 3280	. . . . . . . . 9 ⊢ Ⅎ𝑗∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗)
60		nfv 1916	. . . . . . . . 9 ⊢ Ⅎ𝑗 𝑦 ∈ ran 𝐵
61	59, 60	nfan 1901	. . . . . . . 8 ⊢ Ⅎ𝑗(∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵)
62		nfv 1916	. . . . . . . 8 ⊢ Ⅎ𝑗 𝑥 ≤ 𝑦
63		simp1l 1196	. . . . . . . . . . 11 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → ∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗))
64		simp2 1136	. . . . . . . . . . 11 ⊢ (((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) ∧ 𝑗 ∈ ℕ ∧ (𝐵‘𝑗) = 𝑦) → 𝑗 ∈ ℕ)
65		rsp 3243	. . . . . . . . . . 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 1137	. . . . . . . . . 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 1118	. . . . . . . 8 ⊢ ((∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) ∧ 𝑦 ∈ ran 𝐵) → (𝑗 ∈ ℕ → ((𝐵‘𝑗) = 𝑦 → 𝑥 ≤ 𝑦)))
70	61, 62, 69	rexlimd 3262	. . . . . . 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 3145	. . . . 5 ⊢ (∀𝑗 ∈ ℕ 𝑥 ≤ (𝐵‘𝑗) → ∀𝑦 ∈ ran 𝐵 𝑥 ≤ 𝑦)
73	72	reximi 3083	. . . 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 12201	. . 3 ⊢ ((ran 𝐵 ⊆ ℝ ∧ ran 𝐵 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ran 𝐵 𝑥 ≤ 𝑦) → inf(ran 𝐵, ℝ, < ) ∈ ℝ)
76	13, 41, 74, 75	mp3an 1460	. 2 ⊢ inf(ran 𝐵, ℝ, < ) ∈ ℝ
77		nnuz 12870	. . . 4 ⊢ ℕ = (ℤ_≥‘1)
78		1zzd 12598	. . . 4 ⊢ (⊤ → 1 ∈ ℤ)
79	2, 8	fmpti 7113	. . . . 5 ⊢ 𝐵:ℕ⟶ℝ
80	79	a1i 11	. . . 4 ⊢ (⊤ → 𝐵:ℕ⟶ℝ)
81		peano2nn 12229	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ)
82	6	a1i 11	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → 𝐴 = (𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛)))))
83		simpr 484	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → 𝑛 = (𝑗 + 1))
84	83	fveq2d 6895	. . . . . . . . . . . 12 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (!‘𝑛) = (!‘(𝑗 + 1)))
85	83	oveq2d 7428	. . . . . . . . . . . . . 14 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (2 · 𝑛) = (2 · (𝑗 + 1)))
86	85	fveq2d 6895	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (√‘(2 · 𝑛)) = (√‘(2 · (𝑗 + 1))))
87	83	oveq1d 7427	. . . . . . . . . . . . . 14 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (𝑛 / e) = ((𝑗 + 1) / e))
88	87, 83	oveq12d 7430	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((𝑛 / e)↑𝑛) = (((𝑗 + 1) / e)↑(𝑗 + 1)))
89	86, 88	oveq12d 7430	. . . . . . . . . . . 12 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛)) = ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))))
90	84, 89	oveq12d 7430	. . . . . . . . . . 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 12537	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ₀)
92		faccl 14248	. . . . . . . . . . . . 13 ⊢ ((𝑗 + 1) ∈ ℕ₀ → (!‘(𝑗 + 1)) ∈ ℕ)
93		nncn 12225	. . . . . . . . . . . . 13 ⊢ ((!‘(𝑗 + 1)) ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℂ)
94	91, 92, 93	3syl 18	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℂ)
95		2cnd 12295	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → 2 ∈ ℂ)
96		nncn 12225	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℂ)
97		1cnd 11214	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 1 ∈ ℂ)
98	96, 97	addcld 11238	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℂ)
99	95, 98	mulcld 11239	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → (2 · (𝑗 + 1)) ∈ ℂ)
100	99	sqrtcld 15389	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ∈ ℂ)
101		ere 16037	. . . . . . . . . . . . . . . . 17 ⊢ e ∈ ℝ
102	101	recni 11233	. . . . . . . . . . . . . . . 16 ⊢ e ∈ ℂ
103	102	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → e ∈ ℂ)
104		0re 11221	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
105		epos 16155	. . . . . . . . . . . . . . . . 17 ⊢ 0 < e
106	104, 105	gtneii 11331	. . . . . . . . . . . . . . . 16 ⊢ e ≠ 0
107	106	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → e ≠ 0)
108	98, 103, 107	divcld 11995	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ∈ ℂ)
109	108, 91	expcld 14116	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ∈ ℂ)
110	100, 109	mulcld 11239	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ∈ ℂ)
111		2rp 12984	. . . . . . . . . . . . . . . . 17 ⊢ 2 ∈ ℝ⁺
112	111	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 2 ∈ ℝ⁺)
113		nnre 12224	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℝ)
114	104	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 0 ∈ ℝ)
115		1red 11220	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 1 ∈ ℝ)
116		0le1 11742	. . . . . . . . . . . . . . . . . . 19 ⊢ 0 ≤ 1
117	116	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 0 ≤ 1)
118		nnge1 12245	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 1 ≤ 𝑗)
119	114, 115, 113, 117, 118	letrd 11376	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ ℕ → 0 ≤ 𝑗)
120	113, 119	ge0p1rpd 13051	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℝ⁺)
121	112, 120	rpmulcld 13037	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (2 · (𝑗 + 1)) ∈ ℝ⁺)
122	121	sqrtgt0d 15364	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → 0 < (√‘(2 · (𝑗 + 1))))
123	122	gt0ne0d 11783	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ≠ 0)
124	81	nnne0d 12267	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ≠ 0)
125	98, 103, 124, 107	divne0d 12011	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ≠ 0)
126		nnz 12584	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℤ)
127	126	peano2zd 12674	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℤ)
128	108, 125, 127	expne0d 14122	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ≠ 0)
129	100, 109, 123, 128	mulne0d 11871	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ≠ 0)
130	94, 110, 129	divcld 11995	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))) ∈ ℂ)
131	82, 90, 81, 130	fvmptd 7005	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → (𝐴‘(𝑗 + 1)) = ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))))
132		nnrp 12990	. . . . . . . . . . . 12 ⊢ ((!‘(𝑗 + 1)) ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℝ⁺)
133	91, 92, 132	3syl 18	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℝ⁺)
134	121	rpsqrtcld 15363	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ∈ ℝ⁺)
135		epr 16156	. . . . . . . . . . . . . . 15 ⊢ e ∈ ℝ⁺
136	135	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → e ∈ ℝ⁺)
137	120, 136	rpdivcld 13038	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ∈ ℝ⁺)
138	137, 127	rpexpcld 14215	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ∈ ℝ⁺)
139	134, 138	rpmulcld 13037	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ∈ ℝ⁺)
140	133, 139	rpdivcld 13038	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))) ∈ ℝ⁺)
141	131, 140	eqeltrd 2832	. . . . . . . . 9 ⊢ (𝑗 ∈ ℕ → (𝐴‘(𝑗 + 1)) ∈ ℝ⁺)
142	141	relogcld 26368	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → (log‘(𝐴‘(𝑗 + 1))) ∈ ℝ)
143		nfcv 2902	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝑗 + 1)
144	21, 143	nffv 6901	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐴‘(𝑗 + 1))
145	19, 144	nffv 6901	. . . . . . . . 9 ⊢ Ⅎ𝑛(log‘(𝐴‘(𝑗 + 1)))
146		2fveq3 6896	. . . . . . . . 9 ⊢ (𝑛 = (𝑗 + 1) → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘(𝑗 + 1))))
147	143, 145, 146, 2	fvmptf 7019	. . . . . . . 8 ⊢ (((𝑗 + 1) ∈ ℕ ∧ (log‘(𝐴‘(𝑗 + 1))) ∈ ℝ) → (𝐵‘(𝑗 + 1)) = (log‘(𝐴‘(𝑗 + 1))))
148	81, 142, 147	syl2anc 583	. . . . . . 7 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) = (log‘(𝐴‘(𝑗 + 1))))
149	148, 142	eqeltrd 2832	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) ∈ ℝ)
150	79	ffvelcdmi 7085	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘𝑗) ∈ ℝ)
151		eqid 2731	. . . . . . 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 45099	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) < (𝐵‘𝑗))
153	149, 150, 152	ltled 11367	. . . . 5 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) ≤ (𝐵‘𝑗))
154	153	adantl 481	. . . 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 44621	. . 3 ⊢ (⊤ → 𝐵 ⇝ inf(ran 𝐵, ℝ, < ))
157	156	mptru 1547	. 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 3612	. 2 ⊢ ((inf(ran 𝐵, ℝ, < ) ∈ ℝ ∧ 𝐵 ⇝ inf(ran 𝐵, ℝ, < )) → ∃𝑑 ∈ ℝ 𝐵 ⇝ 𝑑)
160	76, 157, 159	mp2an 689	1 ⊢ ∃𝑑 ∈ ℝ 𝐵 ⇝ 𝑑

Colors of variables: wff setvar class

Syntax hints: ↔ wb 205 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ⊤wtru 1541 ∈ wcel 2105 ≠ wne 2939 ∀wral 3060 ∃wrex 3069 Vcvv 3473 ⊆ wss 3948 ∅c0 4322 class class class wbr 5148 ↦ cmpt 5231 ran crn 5677 Fn wfn 6538 ⟶wf 6539 ‘cfv 6543 (class class class)co 7412 infcinf 9440 ℂcc 11112 ℝcr 11113 0cc0 11114 1c1 11115 + caddc 11117 · cmul 11119 < clt 11253 ≤ cle 11254 − cmin 11449 / cdiv 11876 ℕcn 12217 2c2 12272 4c4 12274 ℕ₀cn0 12477 ℝ⁺crp 12979 ↑cexp 14032 !cfa 14238 √csqrt 15185 ⇝ cli 15433 eceu 16011 logclog 26300

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-inf2 9640 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191 ax-pre-sup 11192 ax-addf 11193 ax-mulf 11194

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 df-v 3475 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 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-of 7674 df-om 7860 df-1st 7979 df-2nd 7980 df-supp 8151 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-2o 8471 df-oadd 8474 df-er 8707 df-map 8826 df-pm 8827 df-ixp 8896 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-fsupp 9366 df-fi 9410 df-sup 9441 df-inf 9442 df-oi 9509 df-card 9938 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-div 11877 df-nn 12218 df-2 12280 df-3 12281 df-4 12282 df-5 12283 df-6 12284 df-7 12285 df-8 12286 df-9 12287 df-n0 12478 df-xnn0 12550 df-z 12564 df-dec 12683 df-uz 12828 df-q 12938 df-rp 12980 df-xneg 13097 df-xadd 13098 df-xmul 13099 df-ioo 13333 df-ioc 13334 df-ico 13335 df-icc 13336 df-fz 13490 df-fzo 13633 df-fl 13762 df-mod 13840 df-seq 13972 df-exp 14033 df-fac 14239 df-bc 14268 df-hash 14296 df-shft 15019 df-cj 15051 df-re 15052 df-im 15053 df-sqrt 15187 df-abs 15188 df-limsup 15420 df-clim 15437 df-rlim 15438 df-sum 15638 df-ef 16016 df-e 16017 df-sin 16018 df-cos 16019 df-tan 16020 df-pi 16021 df-dvds 16203 df-struct 17085 df-sets 17102 df-slot 17120 df-ndx 17132 df-base 17150 df-ress 17179 df-plusg 17215 df-mulr 17216 df-starv 17217 df-sca 17218 df-vsca 17219 df-ip 17220 df-tset 17221 df-ple 17222 df-ds 17224 df-unif 17225 df-hom 17226 df-cco 17227 df-rest 17373 df-topn 17374 df-0g 17392 df-gsum 17393 df-topgen 17394 df-pt 17395 df-prds 17398 df-xrs 17453 df-qtop 17458 df-imas 17459 df-xps 17461 df-mre 17535 df-mrc 17536 df-acs 17538 df-mgm 18566 df-sgrp 18645 df-mnd 18661 df-submnd 18707 df-mulg 18988 df-cntz 19223 df-cmn 19692 df-psmet 21137 df-xmet 21138 df-met 21139 df-bl 21140 df-mopn 21141 df-fbas 21142 df-fg 21143 df-cnfld 21146 df-top 22617 df-topon 22634 df-topsp 22656 df-bases 22670 df-cld 22744 df-ntr 22745 df-cls 22746 df-nei 22823 df-lp 22861 df-perf 22862 df-cn 22952 df-cnp 22953 df-haus 23040 df-cmp 23112 df-tx 23287 df-hmeo 23480 df-fil 23571 df-fm 23663 df-flim 23664 df-flf 23665 df-xms 24047 df-ms 24048 df-tms 24049 df-cncf 24619 df-limc 25616 df-dv 25617 df-ulm 26126 df-log 26302 df-cxp 26303

This theorem is referenced by: stirlinglem14 45102

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