Proof of Theorem cxp2limlem
Step | Hyp | Ref
| Expression |
1 | | 0red 10978 |
. 2
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 0 ∈
ℝ) |
2 | | 2rp 12735 |
. . . . 5
⊢ 2 ∈
ℝ+ |
3 | | rplogcl 25759 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (log‘𝐴) ∈
ℝ+) |
4 | | 2z 12352 |
. . . . . 6
⊢ 2 ∈
ℤ |
5 | | rpexpcl 13801 |
. . . . . 6
⊢
(((log‘𝐴)
∈ ℝ+ ∧ 2 ∈ ℤ) → ((log‘𝐴)↑2) ∈
ℝ+) |
6 | 3, 4, 5 | sylancl 586 |
. . . . 5
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → ((log‘𝐴)↑2) ∈
ℝ+) |
7 | | rpdivcl 12755 |
. . . . 5
⊢ ((2
∈ ℝ+ ∧ ((log‘𝐴)↑2) ∈ ℝ+) →
(2 / ((log‘𝐴)↑2)) ∈
ℝ+) |
8 | 2, 6, 7 | sylancr 587 |
. . . 4
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (2 /
((log‘𝐴)↑2))
∈ ℝ+) |
9 | 8 | rpcnd 12774 |
. . 3
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (2 /
((log‘𝐴)↑2))
∈ ℂ) |
10 | | divrcnv 15564 |
. . 3
⊢ ((2 /
((log‘𝐴)↑2))
∈ ℂ → (𝑛
∈ ℝ+ ↦ ((2 / ((log‘𝐴)↑2)) / 𝑛)) ⇝𝑟
0) |
11 | 9, 10 | syl 17 |
. 2
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (𝑛 ∈ ℝ+
↦ ((2 / ((log‘𝐴)↑2)) / 𝑛)) ⇝𝑟
0) |
12 | 8 | rpred 12772 |
. . 3
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (2 /
((log‘𝐴)↑2))
∈ ℝ) |
13 | | rerpdivcl 12760 |
. . 3
⊢ (((2 /
((log‘𝐴)↑2))
∈ ℝ ∧ 𝑛
∈ ℝ+) → ((2 / ((log‘𝐴)↑2)) / 𝑛) ∈ ℝ) |
14 | 12, 13 | sylan 580 |
. 2
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((2 /
((log‘𝐴)↑2)) /
𝑛) ∈
ℝ) |
15 | | simpr 485 |
. . . 4
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝑛 ∈
ℝ+) |
16 | | simpl 483 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 𝐴 ∈ ℝ) |
17 | | 1red 10976 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 1 ∈
ℝ) |
18 | | 0lt1 11497 |
. . . . . . . 8
⊢ 0 <
1 |
19 | 18 | a1i 11 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 0 <
1) |
20 | | simpr 485 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 1 < 𝐴) |
21 | 1, 17, 16, 19, 20 | lttrd 11136 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 0 < 𝐴) |
22 | 16, 21 | elrpd 12769 |
. . . . 5
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 𝐴 ∈
ℝ+) |
23 | | rpre 12738 |
. . . . 5
⊢ (𝑛 ∈ ℝ+
→ 𝑛 ∈
ℝ) |
24 | | rpcxpcl 25831 |
. . . . 5
⊢ ((𝐴 ∈ ℝ+
∧ 𝑛 ∈ ℝ)
→ (𝐴↑𝑐𝑛) ∈
ℝ+) |
25 | 22, 23, 24 | syl2an 596 |
. . . 4
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝐴↑𝑐𝑛) ∈
ℝ+) |
26 | 15, 25 | rpdivcld 12789 |
. . 3
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / (𝐴↑𝑐𝑛)) ∈
ℝ+) |
27 | 26 | rpred 12772 |
. 2
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / (𝐴↑𝑐𝑛)) ∈ ℝ) |
28 | 3 | adantr 481 |
. . . . . . . . . . . 12
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) →
(log‘𝐴) ∈
ℝ+) |
29 | 15, 28 | rpmulcld 12788 |
. . . . . . . . . . 11
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 · (log‘𝐴)) ∈
ℝ+) |
30 | 29 | rpred 12772 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 · (log‘𝐴)) ∈
ℝ) |
31 | 30 | resqcld 13965 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛 · (log‘𝐴))↑2) ∈
ℝ) |
32 | 31 | rehalfcld 12220 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (((𝑛 · (log‘𝐴))↑2) / 2) ∈
ℝ) |
33 | | 1rp 12734 |
. . . . . . . . . . 11
⊢ 1 ∈
ℝ+ |
34 | | rpaddcl 12752 |
. . . . . . . . . . 11
⊢ ((1
∈ ℝ+ ∧ (𝑛 · (log‘𝐴)) ∈ ℝ+) → (1 +
(𝑛 ·
(log‘𝐴))) ∈
ℝ+) |
35 | 33, 29, 34 | sylancr 587 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (1 +
(𝑛 ·
(log‘𝐴))) ∈
ℝ+) |
36 | 35 | rpred 12772 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (1 +
(𝑛 ·
(log‘𝐴))) ∈
ℝ) |
37 | 36, 32 | readdcld 11004 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((1 +
(𝑛 ·
(log‘𝐴))) + (((𝑛 · (log‘𝐴))↑2) / 2)) ∈
ℝ) |
38 | 30 | reefcld 15797 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) →
(exp‘(𝑛 ·
(log‘𝐴))) ∈
ℝ) |
39 | 32, 35 | ltaddrp2d 12806 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (((𝑛 · (log‘𝐴))↑2) / 2) < ((1 +
(𝑛 ·
(log‘𝐴))) + (((𝑛 · (log‘𝐴))↑2) /
2))) |
40 | | efgt1p2 15823 |
. . . . . . . . 9
⊢ ((𝑛 · (log‘𝐴)) ∈ ℝ+
→ ((1 + (𝑛 ·
(log‘𝐴))) + (((𝑛 · (log‘𝐴))↑2) / 2)) <
(exp‘(𝑛 ·
(log‘𝐴)))) |
41 | 29, 40 | syl 17 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((1 +
(𝑛 ·
(log‘𝐴))) + (((𝑛 · (log‘𝐴))↑2) / 2)) <
(exp‘(𝑛 ·
(log‘𝐴)))) |
42 | 32, 37, 38, 39, 41 | lttrd 11136 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (((𝑛 · (log‘𝐴))↑2) / 2) <
(exp‘(𝑛 ·
(log‘𝐴)))) |
43 | 23 | adantl 482 |
. . . . . . . . . . 11
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝑛 ∈
ℝ) |
44 | 43 | recnd 11003 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝑛 ∈
ℂ) |
45 | 44 | sqcld 13862 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛↑2) ∈
ℂ) |
46 | | 2cnd 12051 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 2 ∈
ℂ) |
47 | 6 | adantr 481 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) →
((log‘𝐴)↑2)
∈ ℝ+) |
48 | 47 | rpcnd 12774 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) →
((log‘𝐴)↑2)
∈ ℂ) |
49 | | 2ne0 12077 |
. . . . . . . . . 10
⊢ 2 ≠
0 |
50 | 49 | a1i 11 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 2 ≠
0) |
51 | 47 | rpne0d 12777 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) →
((log‘𝐴)↑2) ≠
0) |
52 | 45, 46, 48, 50, 51 | divdiv2d 11783 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛↑2) / (2 /
((log‘𝐴)↑2))) =
(((𝑛↑2) ·
((log‘𝐴)↑2)) /
2)) |
53 | 3 | rpcnd 12774 |
. . . . . . . . . . 11
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (log‘𝐴) ∈
ℂ) |
54 | 53 | adantr 481 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) →
(log‘𝐴) ∈
ℂ) |
55 | 44, 54 | sqmuld 13876 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛 · (log‘𝐴))↑2) = ((𝑛↑2) ·
((log‘𝐴)↑2))) |
56 | 55 | oveq1d 7290 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (((𝑛 · (log‘𝐴))↑2) / 2) = (((𝑛↑2) ·
((log‘𝐴)↑2)) /
2)) |
57 | 52, 56 | eqtr4d 2781 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛↑2) / (2 /
((log‘𝐴)↑2))) =
(((𝑛 ·
(log‘𝐴))↑2) /
2)) |
58 | 16 | recnd 11003 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → 𝐴 ∈ ℂ) |
59 | 58 | adantr 481 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝐴 ∈
ℂ) |
60 | 22 | adantr 481 |
. . . . . . . . 9
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝐴 ∈
ℝ+) |
61 | 60 | rpne0d 12777 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝐴 ≠ 0) |
62 | 59, 61, 44 | cxpefd 25867 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝐴↑𝑐𝑛) = (exp‘(𝑛 · (log‘𝐴)))) |
63 | 42, 57, 62 | 3brtr4d 5106 |
. . . . . 6
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛↑2) / (2 /
((log‘𝐴)↑2)))
< (𝐴↑𝑐𝑛)) |
64 | | rpexpcl 13801 |
. . . . . . . . 9
⊢ ((𝑛 ∈ ℝ+
∧ 2 ∈ ℤ) → (𝑛↑2) ∈
ℝ+) |
65 | 15, 4, 64 | sylancl 586 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛↑2) ∈
ℝ+) |
66 | 8 | adantr 481 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (2 /
((log‘𝐴)↑2))
∈ ℝ+) |
67 | 65, 66 | rpdivcld 12789 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛↑2) / (2 /
((log‘𝐴)↑2)))
∈ ℝ+) |
68 | 67, 25, 15 | ltdiv2d 12795 |
. . . . . 6
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (((𝑛↑2) / (2 /
((log‘𝐴)↑2)))
< (𝐴↑𝑐𝑛) ↔ (𝑛 / (𝐴↑𝑐𝑛)) < (𝑛 / ((𝑛↑2) / (2 / ((log‘𝐴)↑2)))))) |
69 | 63, 68 | mpbid 231 |
. . . . 5
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / (𝐴↑𝑐𝑛)) < (𝑛 / ((𝑛↑2) / (2 / ((log‘𝐴)↑2))))) |
70 | 9 | adantr 481 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (2 /
((log‘𝐴)↑2))
∈ ℂ) |
71 | 65 | rpne0d 12777 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛↑2) ≠
0) |
72 | 66 | rpne0d 12777 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (2 /
((log‘𝐴)↑2))
≠ 0) |
73 | 44, 45, 70, 71, 72 | divdiv2d 11783 |
. . . . . 6
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / ((𝑛↑2) / (2 / ((log‘𝐴)↑2)))) = ((𝑛 · (2 / ((log‘𝐴)↑2))) / (𝑛↑2))) |
74 | 44 | sqvald 13861 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛↑2) = (𝑛 · 𝑛)) |
75 | 74 | oveq2d 7291 |
. . . . . 6
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛 · (2 / ((log‘𝐴)↑2))) / (𝑛↑2)) = ((𝑛 · (2 / ((log‘𝐴)↑2))) / (𝑛 · 𝑛))) |
76 | | rpne0 12746 |
. . . . . . . 8
⊢ (𝑛 ∈ ℝ+
→ 𝑛 ≠
0) |
77 | 76 | adantl 482 |
. . . . . . 7
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 𝑛 ≠ 0) |
78 | 70, 44, 44, 77, 77 | divcan5d 11777 |
. . . . . 6
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → ((𝑛 · (2 / ((log‘𝐴)↑2))) / (𝑛 · 𝑛)) = ((2 / ((log‘𝐴)↑2)) / 𝑛)) |
79 | 73, 75, 78 | 3eqtrd 2782 |
. . . . 5
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / ((𝑛↑2) / (2 / ((log‘𝐴)↑2)))) = ((2 / ((log‘𝐴)↑2)) / 𝑛)) |
80 | 69, 79 | breqtrd 5100 |
. . . 4
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / (𝐴↑𝑐𝑛)) < ((2 / ((log‘𝐴)↑2)) / 𝑛)) |
81 | 27, 14, 80 | ltled 11123 |
. . 3
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → (𝑛 / (𝐴↑𝑐𝑛)) ≤ ((2 / ((log‘𝐴)↑2)) / 𝑛)) |
82 | 81 | adantrr 714 |
. 2
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ (𝑛 ∈ ℝ+
∧ 0 ≤ 𝑛)) →
(𝑛 / (𝐴↑𝑐𝑛)) ≤ ((2 / ((log‘𝐴)↑2)) / 𝑛)) |
83 | 26 | rpge0d 12776 |
. . 3
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ 𝑛 ∈ ℝ+) → 0 ≤
(𝑛 / (𝐴↑𝑐𝑛))) |
84 | 83 | adantrr 714 |
. 2
⊢ (((𝐴 ∈ ℝ ∧ 1 <
𝐴) ∧ (𝑛 ∈ ℝ+
∧ 0 ≤ 𝑛)) → 0
≤ (𝑛 / (𝐴↑𝑐𝑛))) |
85 | 1, 1, 11, 14, 27, 82, 84 | rlimsqz2 15362 |
1
⊢ ((𝐴 ∈ ℝ ∧ 1 <
𝐴) → (𝑛 ∈ ℝ+
↦ (𝑛 / (𝐴↑𝑐𝑛))) ⇝𝑟
0) |