stirlinglem13 - Mathbox for Glauco Siliprandi

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Theorem stirlinglem13 44802

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 5956	. . . . . 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 44791	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → (𝐴‘𝑛) ∈ ℝ⁺)
8	7	relogcld 26131	. . . . . . . 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 3987	. . 3 ⊢ ran 𝐵 ⊆ ℝ
14		1nn 12223	. . . . . 6 ⊢ 1 ∈ ℕ
15	6	stirlinglem2 44791	. . . . . . . 8 ⊢ (1 ∈ ℕ → (𝐴‘1) ∈ ℝ⁺)
16		relogcl 26084	. . . . . . . 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 5257	. . . . . . . . . . 11 ⊢ Ⅎ𝑛(𝑛 ∈ ℕ ↦ ((!‘𝑛) / ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛))))
21	6, 20	nfcxfr 2902	. . . . . . . . . 10 ⊢ Ⅎ𝑛𝐴
22	21, 18	nffv 6902	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝐴‘1)
23	19, 22	nffv 6902	. . . . . . . 8 ⊢ Ⅎ𝑛(log‘(𝐴‘1))
24		2fveq3 6897	. . . . . . . 8 ⊢ (𝑛 = 1 → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘1)))
25	18, 23, 24, 2	fvmptf 7020	. . . . . . 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 6897	. . . . . . 7 ⊢ (𝑗 = 1 → (log‘(𝐴‘𝑗)) = (log‘(𝐴‘1)))
28	27	rspceeqv 3634	. . . . . 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 6902	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐴‘𝑗)
34	19, 33	nffv 6902	. . . . . . . . 9 ⊢ Ⅎ𝑛(log‘(𝐴‘𝑗))
35		2fveq3 6897	. . . . . . . . 9 ⊢ (𝑛 = 𝑗 → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘𝑗)))
36	31, 34, 35	cbvmpt 5260	. . . . . . . 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 5956	. . . . . 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 4338	. . 3 ⊢ ran 𝐵 ≠ ∅
42		4re 12296	. . . . . . 7 ⊢ 4 ∈ ℝ
43		4ne0 12320	. . . . . . 7 ⊢ 4 ≠ 0
44	42, 43	rereccli 11979	. . . . . 6 ⊢ (1 / 4) ∈ ℝ
45	30, 44	resubcli 11522	. . . . 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 44801	. . . . . 6 ⊢ (𝑗 ∈ ℕ → ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗))
48	47	rgen 3064	. . . . 5 ⊢ ∀𝑗 ∈ ℕ ((𝐵‘1) − (1 / 4)) ≤ (𝐵‘𝑗)
49		breq1 5152	. . . . . . 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 6691	. . . . . . . . 9 ⊢ (∀𝑛 ∈ ℕ (log‘(𝐴‘𝑛)) ∈ ℝ → 𝐵 Fn ℕ)
56		fvelrnb 6953	. . . . . . . . 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 5175	. . . . . . . . 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 12196	. . 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 12865	. . . 4 ⊢ ℕ = (ℤ_≥‘1)
78		1zzd 12593	. . . 4 ⊢ (⊤ → 1 ∈ ℤ)
79	2, 8	fmpti 7112	. . . . 5 ⊢ 𝐵:ℕ⟶ℝ
80	79	a1i 11	. . . 4 ⊢ (⊤ → 𝐵:ℕ⟶ℝ)
81		peano2nn 12224	. . . . . . . 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 6896	. . . . . . . . . . . 12 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (!‘𝑛) = (!‘(𝑗 + 1)))
85	83	oveq2d 7425	. . . . . . . . . . . . . 14 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (2 · 𝑛) = (2 · (𝑗 + 1)))
86	85	fveq2d 6896	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (√‘(2 · 𝑛)) = (√‘(2 · (𝑗 + 1))))
87	83	oveq1d 7424	. . . . . . . . . . . . . 14 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → (𝑛 / e) = ((𝑗 + 1) / e))
88	87, 83	oveq12d 7427	. . . . . . . . . . . . 13 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((𝑛 / e)↑𝑛) = (((𝑗 + 1) / e)↑(𝑗 + 1)))
89	86, 88	oveq12d 7427	. . . . . . . . . . . 12 ⊢ ((𝑗 ∈ ℕ ∧ 𝑛 = (𝑗 + 1)) → ((√‘(2 · 𝑛)) · ((𝑛 / e)↑𝑛)) = ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))))
90	84, 89	oveq12d 7427	. . . . . . . . . . 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 12532	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℕ₀)
92		faccl 14243	. . . . . . . . . . . . 13 ⊢ ((𝑗 + 1) ∈ ℕ₀ → (!‘(𝑗 + 1)) ∈ ℕ)
93		nncn 12220	. . . . . . . . . . . . 13 ⊢ ((!‘(𝑗 + 1)) ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℂ)
94	91, 92, 93	3syl 18	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℂ)
95		2cnd 12290	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → 2 ∈ ℂ)
96		nncn 12220	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℂ)
97		1cnd 11209	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 1 ∈ ℂ)
98	96, 97	addcld 11233	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℂ)
99	95, 98	mulcld 11234	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → (2 · (𝑗 + 1)) ∈ ℂ)
100	99	sqrtcld 15384	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ∈ ℂ)
101		ere 16032	. . . . . . . . . . . . . . . . 17 ⊢ e ∈ ℝ
102	101	recni 11228	. . . . . . . . . . . . . . . 16 ⊢ e ∈ ℂ
103	102	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → e ∈ ℂ)
104		0re 11216	. . . . . . . . . . . . . . . . 17 ⊢ 0 ∈ ℝ
105		epos 16150	. . . . . . . . . . . . . . . . 17 ⊢ 0 < e
106	104, 105	gtneii 11326	. . . . . . . . . . . . . . . 16 ⊢ e ≠ 0
107	106	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → e ≠ 0)
108	98, 103, 107	divcld 11990	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ∈ ℂ)
109	108, 91	expcld 14111	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ∈ ℂ)
110	100, 109	mulcld 11234	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ∈ ℂ)
111		2rp 12979	. . . . . . . . . . . . . . . . 17 ⊢ 2 ∈ ℝ⁺
112	111	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → 2 ∈ ℝ⁺)
113		nnre 12219	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℝ)
114	104	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 0 ∈ ℝ)
115		1red 11215	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 1 ∈ ℝ)
116		0le1 11737	. . . . . . . . . . . . . . . . . . 19 ⊢ 0 ≤ 1
117	116	a1i 11	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 0 ≤ 1)
118		nnge1 12240	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑗 ∈ ℕ → 1 ≤ 𝑗)
119	114, 115, 113, 117, 118	letrd 11371	. . . . . . . . . . . . . . . . 17 ⊢ (𝑗 ∈ ℕ → 0 ≤ 𝑗)
120	113, 119	ge0p1rpd 13046	. . . . . . . . . . . . . . . 16 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℝ⁺)
121	112, 120	rpmulcld 13032	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (2 · (𝑗 + 1)) ∈ ℝ⁺)
122	121	sqrtgt0d 15359	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → 0 < (√‘(2 · (𝑗 + 1))))
123	122	gt0ne0d 11778	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ≠ 0)
124	81	nnne0d 12262	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ≠ 0)
125	98, 103, 124, 107	divne0d 12006	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ≠ 0)
126		nnz 12579	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ ℕ → 𝑗 ∈ ℤ)
127	126	peano2zd 12669	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → (𝑗 + 1) ∈ ℤ)
128	108, 125, 127	expne0d 14117	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ≠ 0)
129	100, 109, 123, 128	mulne0d 11866	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ≠ 0)
130	94, 110, 129	divcld 11990	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))) ∈ ℂ)
131	82, 90, 81, 130	fvmptd 7006	. . . . . . . . . 10 ⊢ (𝑗 ∈ ℕ → (𝐴‘(𝑗 + 1)) = ((!‘(𝑗 + 1)) / ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1)))))
132		nnrp 12985	. . . . . . . . . . . 12 ⊢ ((!‘(𝑗 + 1)) ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℝ⁺)
133	91, 92, 132	3syl 18	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → (!‘(𝑗 + 1)) ∈ ℝ⁺)
134	121	rpsqrtcld 15358	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (√‘(2 · (𝑗 + 1))) ∈ ℝ⁺)
135		epr 16151	. . . . . . . . . . . . . . 15 ⊢ e ∈ ℝ⁺
136	135	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑗 ∈ ℕ → e ∈ ℝ⁺)
137	120, 136	rpdivcld 13033	. . . . . . . . . . . . 13 ⊢ (𝑗 ∈ ℕ → ((𝑗 + 1) / e) ∈ ℝ⁺)
138	137, 127	rpexpcld 14210	. . . . . . . . . . . 12 ⊢ (𝑗 ∈ ℕ → (((𝑗 + 1) / e)↑(𝑗 + 1)) ∈ ℝ⁺)
139	134, 138	rpmulcld 13032	. . . . . . . . . . 11 ⊢ (𝑗 ∈ ℕ → ((√‘(2 · (𝑗 + 1))) · (((𝑗 + 1) / e)↑(𝑗 + 1))) ∈ ℝ⁺)
140	133, 139	rpdivcld 13033	. . . . . . . . . 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 26131	. . . . . . . 8 ⊢ (𝑗 ∈ ℕ → (log‘(𝐴‘(𝑗 + 1))) ∈ ℝ)
143		nfcv 2904	. . . . . . . . 9 ⊢ Ⅎ𝑛(𝑗 + 1)
144	21, 143	nffv 6902	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝐴‘(𝑗 + 1))
145	19, 144	nffv 6902	. . . . . . . . 9 ⊢ Ⅎ𝑛(log‘(𝐴‘(𝑗 + 1)))
146		2fveq3 6897	. . . . . . . . 9 ⊢ (𝑛 = (𝑗 + 1) → (log‘(𝐴‘𝑛)) = (log‘(𝐴‘(𝑗 + 1))))
147	143, 145, 146, 2	fvmptf 7020	. . . . . . . 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 7086	. . . . . 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 44800	. . . . . 6 ⊢ (𝑗 ∈ ℕ → (𝐵‘(𝑗 + 1)) < (𝐵‘𝑗))
153	149, 150, 152	ltled 11362	. . . . 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 44322	. . 3 ⊢ (⊤ → 𝐵 ⇝ inf(ran 𝐵, ℝ, < ))
157	156	mptru 1549	. 2 ⊢ 𝐵 ⇝ inf(ran 𝐵, ℝ, < )
158		breq2 5153	. . 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 3949 ∅c0 4323 class class class wbr 5149 ↦ cmpt 5232 ran crn 5678 Fn wfn 6539 ⟶wf 6540 ‘cfv 6544 (class class class)co 7409 infcinf 9436 ℂcc 11108 ℝcr 11109 0cc0 11110 1c1 11111 + caddc 11113 · cmul 11115 < clt 11248 ≤ cle 11249 − cmin 11444 / cdiv 11871 ℕcn 12212 2c2 12267 4c4 12269 ℕ₀cn0 12472 ℝ⁺crp 12974 ↑cexp 14027 !cfa 14233 √csqrt 15180 ⇝ cli 15428 eceu 16006 logclog 26063

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 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-inf2 9636 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 ax-pre-sup 11188 ax-addf 11189 ax-mulf 11190

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 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-tp 4634 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 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-se 5633 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-pred 6301 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-isom 6553 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-of 7670 df-om 7856 df-1st 7975 df-2nd 7976 df-supp 8147 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-2o 8467 df-oadd 8470 df-er 8703 df-map 8822 df-pm 8823 df-ixp 8892 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-fsupp 9362 df-fi 9406 df-sup 9437 df-inf 9438 df-oi 9505 df-card 9934 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-3 12276 df-4 12277 df-5 12278 df-6 12279 df-7 12280 df-8 12281 df-9 12282 df-n0 12473 df-xnn0 12545 df-z 12559 df-dec 12678 df-uz 12823 df-q 12933 df-rp 12975 df-xneg 13092 df-xadd 13093 df-xmul 13094 df-ioo 13328 df-ioc 13329 df-ico 13330 df-icc 13331 df-fz 13485 df-fzo 13628 df-fl 13757 df-mod 13835 df-seq 13967 df-exp 14028 df-fac 14234 df-bc 14263 df-hash 14291 df-shft 15014 df-cj 15046 df-re 15047 df-im 15048 df-sqrt 15182 df-abs 15183 df-limsup 15415 df-clim 15432 df-rlim 15433 df-sum 15633 df-ef 16011 df-e 16012 df-sin 16013 df-cos 16014 df-tan 16015 df-pi 16016 df-dvds 16198 df-struct 17080 df-sets 17097 df-slot 17115 df-ndx 17127 df-base 17145 df-ress 17174 df-plusg 17210 df-mulr 17211 df-starv 17212 df-sca 17213 df-vsca 17214 df-ip 17215 df-tset 17216 df-ple 17217 df-ds 17219 df-unif 17220 df-hom 17221 df-cco 17222 df-rest 17368 df-topn 17369 df-0g 17387 df-gsum 17388 df-topgen 17389 df-pt 17390 df-prds 17393 df-xrs 17448 df-qtop 17453 df-imas 17454 df-xps 17456 df-mre 17530 df-mrc 17531 df-acs 17533 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-submnd 18672 df-mulg 18951 df-cntz 19181 df-cmn 19650 df-psmet 20936 df-xmet 20937 df-met 20938 df-bl 20939 df-mopn 20940 df-fbas 20941 df-fg 20942 df-cnfld 20945 df-top 22396 df-topon 22413 df-topsp 22435 df-bases 22449 df-cld 22523 df-ntr 22524 df-cls 22525 df-nei 22602 df-lp 22640 df-perf 22641 df-cn 22731 df-cnp 22732 df-haus 22819 df-cmp 22891 df-tx 23066 df-hmeo 23259 df-fil 23350 df-fm 23442 df-flim 23443 df-flf 23444 df-xms 23826 df-ms 23827 df-tms 23828 df-cncf 24394 df-limc 25383 df-dv 25384 df-ulm 25889 df-log 26065 df-cxp 26066

This theorem is referenced by: stirlinglem14 44803

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