Proof of Theorem dvatan
Step | Hyp | Ref
| Expression |
1 | | cnelprrecn 9908 |
. . . . 5
⊢ ℂ
∈ {ℝ, ℂ} |
2 | 1 | a1i 11 |
. . . 4
⊢ (⊤
→ ℂ ∈ {ℝ, ℂ}) |
3 | | ax-1cn 9873 |
. . . . . . 7
⊢ 1 ∈
ℂ |
4 | | ax-icn 9874 |
. . . . . . . 8
⊢ i ∈
ℂ |
5 | | atansopn.d |
. . . . . . . . . . . 12
⊢ 𝐷 = (ℂ ∖
(-∞(,]0)) |
6 | | atansopn.s |
. . . . . . . . . . . 12
⊢ 𝑆 = {𝑦 ∈ ℂ ∣ (1 + (𝑦↑2)) ∈ 𝐷} |
7 | 5, 6 | atansssdm 24460 |
. . . . . . . . . . 11
⊢ 𝑆 ⊆ dom
arctan |
8 | | simpr 476 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → 𝑥 ∈ 𝑆) |
9 | 7, 8 | sseldi 3566 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → 𝑥 ∈ dom
arctan) |
10 | | atandm2 24404 |
. . . . . . . . . 10
⊢ (𝑥 ∈ dom arctan ↔ (𝑥 ∈ ℂ ∧ (1 −
(i · 𝑥)) ≠ 0
∧ (1 + (i · 𝑥))
≠ 0)) |
11 | 9, 10 | sylib 207 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 ∈ ℂ ∧ (1 −
(i · 𝑥)) ≠ 0
∧ (1 + (i · 𝑥))
≠ 0)) |
12 | 11 | simp1d 1066 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → 𝑥 ∈
ℂ) |
13 | | mulcl 9899 |
. . . . . . . 8
⊢ ((i
∈ ℂ ∧ 𝑥
∈ ℂ) → (i · 𝑥) ∈ ℂ) |
14 | 4, 12, 13 | sylancr 694 |
. . . . . . 7
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (i
· 𝑥) ∈
ℂ) |
15 | | subcl 10159 |
. . . . . . 7
⊢ ((1
∈ ℂ ∧ (i · 𝑥) ∈ ℂ) → (1 − (i
· 𝑥)) ∈
ℂ) |
16 | 3, 14, 15 | sylancr 694 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 −
(i · 𝑥)) ∈
ℂ) |
17 | 11 | simp2d 1067 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 −
(i · 𝑥)) ≠
0) |
18 | 16, 17 | logcld 24121 |
. . . . 5
⊢
((⊤ ∧ 𝑥
∈ 𝑆) →
(log‘(1 − (i · 𝑥))) ∈ ℂ) |
19 | | addcl 9897 |
. . . . . . 7
⊢ ((1
∈ ℂ ∧ (i · 𝑥) ∈ ℂ) → (1 + (i ·
𝑥)) ∈
ℂ) |
20 | 3, 14, 19 | sylancr 694 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 + (i
· 𝑥)) ∈
ℂ) |
21 | 11 | simp3d 1068 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 + (i
· 𝑥)) ≠
0) |
22 | 20, 21 | logcld 24121 |
. . . . 5
⊢
((⊤ ∧ 𝑥
∈ 𝑆) →
(log‘(1 + (i · 𝑥))) ∈ ℂ) |
23 | 18, 22 | subcld 10271 |
. . . 4
⊢
((⊤ ∧ 𝑥
∈ 𝑆) →
((log‘(1 − (i · 𝑥))) − (log‘(1 + (i · 𝑥)))) ∈
ℂ) |
24 | | ovex 6577 |
. . . . 5
⊢ ((2 / i)
/ (1 + (𝑥↑2))) ∈
V |
25 | 24 | a1i 11 |
. . . 4
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((2 / i) /
(1 + (𝑥↑2))) ∈
V) |
26 | | ovex 6577 |
. . . . . . 7
⊢ (1 /
(𝑥 + i)) ∈
V |
27 | 26 | a1i 11 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 /
(𝑥 + i)) ∈
V) |
28 | 5, 6 | atans2 24458 |
. . . . . . . . . 10
⊢ (𝑥 ∈ 𝑆 ↔ (𝑥 ∈ ℂ ∧ (1 − (i ·
𝑥)) ∈ 𝐷 ∧ (1 + (i · 𝑥)) ∈ 𝐷)) |
29 | 28 | simp2bi 1070 |
. . . . . . . . 9
⊢ (𝑥 ∈ 𝑆 → (1 − (i · 𝑥)) ∈ 𝐷) |
30 | 29 | adantl 481 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 −
(i · 𝑥)) ∈
𝐷) |
31 | | negex 10158 |
. . . . . . . . 9
⊢ -i ∈
V |
32 | 31 | a1i 11 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → -i ∈
V) |
33 | 5 | logdmss 24188 |
. . . . . . . . . 10
⊢ 𝐷 ⊆ (ℂ ∖
{0}) |
34 | | simpr 476 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑦
∈ 𝐷) → 𝑦 ∈ 𝐷) |
35 | 33, 34 | sseldi 3566 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑦
∈ 𝐷) → 𝑦 ∈ (ℂ ∖
{0})) |
36 | | logf1o 24115 |
. . . . . . . . . . 11
⊢
log:(ℂ ∖ {0})–1-1-onto→ran
log |
37 | | f1of 6050 |
. . . . . . . . . . 11
⊢
(log:(ℂ ∖ {0})–1-1-onto→ran
log → log:(ℂ ∖ {0})⟶ran log) |
38 | 36, 37 | ax-mp 5 |
. . . . . . . . . 10
⊢
log:(ℂ ∖ {0})⟶ran log |
39 | 38 | ffvelrni 6266 |
. . . . . . . . 9
⊢ (𝑦 ∈ (ℂ ∖ {0})
→ (log‘𝑦) ∈
ran log) |
40 | | logrncn 24113 |
. . . . . . . . 9
⊢
((log‘𝑦)
∈ ran log → (log‘𝑦) ∈ ℂ) |
41 | 35, 39, 40 | 3syl 18 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑦
∈ 𝐷) →
(log‘𝑦) ∈
ℂ) |
42 | | ovex 6577 |
. . . . . . . . 9
⊢ (1 /
𝑦) ∈
V |
43 | 42 | a1i 11 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑦
∈ 𝐷) → (1 / 𝑦) ∈ V) |
44 | 4 | a1i 11 |
. . . . . . . . . . 11
⊢ (⊤
→ i ∈ ℂ) |
45 | 44, 13 | sylan 487 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ ℂ) → (i · 𝑥) ∈ ℂ) |
46 | 3, 45, 15 | sylancr 694 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ ℂ) → (1 − (i · 𝑥)) ∈ ℂ) |
47 | 31 | a1i 11 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ ℂ) → -i ∈ V) |
48 | | 1cnd 9935 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ ℂ) → 1 ∈ ℂ) |
49 | | 0cnd 9912 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ ℂ) → 0 ∈ ℂ) |
50 | | 1cnd 9935 |
. . . . . . . . . . . 12
⊢ (⊤
→ 1 ∈ ℂ) |
51 | 2, 50 | dvmptc 23527 |
. . . . . . . . . . 11
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ 1)) = (𝑥
∈ ℂ ↦ 0)) |
52 | 4 | a1i 11 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ ℂ) → i ∈ ℂ) |
53 | | simpr 476 |
. . . . . . . . . . . . 13
⊢
((⊤ ∧ 𝑥
∈ ℂ) → 𝑥
∈ ℂ) |
54 | 2 | dvmptid 23526 |
. . . . . . . . . . . . 13
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ 𝑥)) =
(𝑥 ∈ ℂ ↦
1)) |
55 | 2, 53, 48, 54, 44 | dvmptcmul 23533 |
. . . . . . . . . . . 12
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ (i · 𝑥))) = (𝑥 ∈ ℂ ↦ (i ·
1))) |
56 | 4 | mulid1i 9921 |
. . . . . . . . . . . . 13
⊢ (i
· 1) = i |
57 | 56 | mpteq2i 4669 |
. . . . . . . . . . . 12
⊢ (𝑥 ∈ ℂ ↦ (i
· 1)) = (𝑥 ∈
ℂ ↦ i) |
58 | 55, 57 | syl6eq 2660 |
. . . . . . . . . . 11
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ (i · 𝑥))) = (𝑥 ∈ ℂ ↦ i)) |
59 | 2, 48, 49, 51, 45, 52, 58 | dvmptsub 23536 |
. . . . . . . . . 10
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ (1 − (i · 𝑥)))) = (𝑥 ∈ ℂ ↦ (0 −
i))) |
60 | | df-neg 10148 |
. . . . . . . . . . 11
⊢ -i = (0
− i) |
61 | 60 | mpteq2i 4669 |
. . . . . . . . . 10
⊢ (𝑥 ∈ ℂ ↦ -i) =
(𝑥 ∈ ℂ ↦
(0 − i)) |
62 | 59, 61 | syl6eqr 2662 |
. . . . . . . . 9
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ (1 − (i · 𝑥)))) = (𝑥 ∈ ℂ ↦ -i)) |
63 | | eqid 2610 |
. . . . . . . . . . . 12
⊢
(TopOpen‘ℂfld) =
(TopOpen‘ℂfld) |
64 | 63 | cnfldtopon 22396 |
. . . . . . . . . . 11
⊢
(TopOpen‘ℂfld) ∈
(TopOn‘ℂ) |
65 | 5, 6 | atansopn 24459 |
. . . . . . . . . . 11
⊢ 𝑆 ∈
(TopOpen‘ℂfld) |
66 | | toponss 20544 |
. . . . . . . . . . 11
⊢
(((TopOpen‘ℂfld) ∈ (TopOn‘ℂ)
∧ 𝑆 ∈
(TopOpen‘ℂfld)) → 𝑆 ⊆ ℂ) |
67 | 64, 65, 66 | mp2an 704 |
. . . . . . . . . 10
⊢ 𝑆 ⊆
ℂ |
68 | 67 | a1i 11 |
. . . . . . . . 9
⊢ (⊤
→ 𝑆 ⊆
ℂ) |
69 | 63 | cnfldtop 22397 |
. . . . . . . . . . 11
⊢
(TopOpen‘ℂfld) ∈ Top |
70 | 64 | toponunii 20547 |
. . . . . . . . . . . 12
⊢ ℂ =
∪
(TopOpen‘ℂfld) |
71 | 70 | restid 15917 |
. . . . . . . . . . 11
⊢
((TopOpen‘ℂfld) ∈ Top →
((TopOpen‘ℂfld) ↾t ℂ) =
(TopOpen‘ℂfld)) |
72 | 69, 71 | ax-mp 5 |
. . . . . . . . . 10
⊢
((TopOpen‘ℂfld) ↾t ℂ) =
(TopOpen‘ℂfld) |
73 | 72 | eqcomi 2619 |
. . . . . . . . 9
⊢
(TopOpen‘ℂfld) =
((TopOpen‘ℂfld) ↾t
ℂ) |
74 | 65 | a1i 11 |
. . . . . . . . 9
⊢ (⊤
→ 𝑆 ∈
(TopOpen‘ℂfld)) |
75 | 2, 46, 47, 62, 68, 73, 63, 74 | dvmptres 23532 |
. . . . . . . 8
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ (1 − (i
· 𝑥)))) = (𝑥 ∈ 𝑆 ↦ -i)) |
76 | | fssres 5983 |
. . . . . . . . . . . . . 14
⊢
((log:(ℂ ∖ {0})⟶ran log ∧ 𝐷 ⊆ (ℂ ∖ {0})) → (log
↾ 𝐷):𝐷⟶ran
log) |
77 | 38, 33, 76 | mp2an 704 |
. . . . . . . . . . . . 13
⊢ (log
↾ 𝐷):𝐷⟶ran log |
78 | 77 | a1i 11 |
. . . . . . . . . . . 12
⊢ (⊤
→ (log ↾ 𝐷):𝐷⟶ran log) |
79 | 78 | feqmptd 6159 |
. . . . . . . . . . 11
⊢ (⊤
→ (log ↾ 𝐷) =
(𝑦 ∈ 𝐷 ↦ ((log ↾ 𝐷)‘𝑦))) |
80 | | fvres 6117 |
. . . . . . . . . . . 12
⊢ (𝑦 ∈ 𝐷 → ((log ↾ 𝐷)‘𝑦) = (log‘𝑦)) |
81 | 80 | mpteq2ia 4668 |
. . . . . . . . . . 11
⊢ (𝑦 ∈ 𝐷 ↦ ((log ↾ 𝐷)‘𝑦)) = (𝑦 ∈ 𝐷 ↦ (log‘𝑦)) |
82 | 79, 81 | syl6req 2661 |
. . . . . . . . . 10
⊢ (⊤
→ (𝑦 ∈ 𝐷 ↦ (log‘𝑦)) = (log ↾ 𝐷)) |
83 | 82 | oveq2d 6565 |
. . . . . . . . 9
⊢ (⊤
→ (ℂ D (𝑦 ∈
𝐷 ↦ (log‘𝑦))) = (ℂ D (log ↾
𝐷))) |
84 | 5 | dvlog 24197 |
. . . . . . . . 9
⊢ (ℂ
D (log ↾ 𝐷)) = (𝑦 ∈ 𝐷 ↦ (1 / 𝑦)) |
85 | 83, 84 | syl6eq 2660 |
. . . . . . . 8
⊢ (⊤
→ (ℂ D (𝑦 ∈
𝐷 ↦ (log‘𝑦))) = (𝑦 ∈ 𝐷 ↦ (1 / 𝑦))) |
86 | | fveq2 6103 |
. . . . . . . 8
⊢ (𝑦 = (1 − (i · 𝑥)) → (log‘𝑦) = (log‘(1 − (i
· 𝑥)))) |
87 | | oveq2 6557 |
. . . . . . . 8
⊢ (𝑦 = (1 − (i · 𝑥)) → (1 / 𝑦) = (1 / (1 − (i ·
𝑥)))) |
88 | 2, 2, 30, 32, 41, 43, 75, 85, 86, 87 | dvmptco 23541 |
. . . . . . 7
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ (log‘(1
− (i · 𝑥)))))
= (𝑥 ∈ 𝑆 ↦ ((1 / (1 − (i
· 𝑥))) ·
-i))) |
89 | | irec 12826 |
. . . . . . . . . 10
⊢ (1 / i) =
-i |
90 | 89 | oveq2i 6560 |
. . . . . . . . 9
⊢ ((1 / (1
− (i · 𝑥)))
· (1 / i)) = ((1 / (1 − (i · 𝑥))) · -i) |
91 | 4 | a1i 11 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → i ∈
ℂ) |
92 | | ine0 10344 |
. . . . . . . . . . . 12
⊢ i ≠
0 |
93 | 92 | a1i 11 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → i ≠
0) |
94 | 16, 91, 17, 93 | recdiv2d 10698 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 / (1
− (i · 𝑥))) /
i) = (1 / ((1 − (i · 𝑥)) · i))) |
95 | 16, 17 | reccld 10673 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 / (1
− (i · 𝑥)))
∈ ℂ) |
96 | 95, 91, 93 | divrecd 10683 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 / (1
− (i · 𝑥))) /
i) = ((1 / (1 − (i · 𝑥))) · (1 / i))) |
97 | | 1cnd 9935 |
. . . . . . . . . . . . . 14
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → 1 ∈
ℂ) |
98 | 97, 14, 91 | subdird 10366 |
. . . . . . . . . . . . 13
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1
− (i · 𝑥))
· i) = ((1 · i) − ((i · 𝑥) · i))) |
99 | 4 | mulid2i 9922 |
. . . . . . . . . . . . . . 15
⊢ (1
· i) = i |
100 | 99 | a1i 11 |
. . . . . . . . . . . . . 14
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1
· i) = i) |
101 | 91, 12, 91 | mul32d 10125 |
. . . . . . . . . . . . . . 15
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((i
· 𝑥) · i) =
((i · i) · 𝑥)) |
102 | | ixi 10535 |
. . . . . . . . . . . . . . . . 17
⊢ (i
· i) = -1 |
103 | 102 | oveq1i 6559 |
. . . . . . . . . . . . . . . 16
⊢ ((i
· i) · 𝑥) =
(-1 · 𝑥) |
104 | 12 | mulm1d 10361 |
. . . . . . . . . . . . . . . 16
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (-1
· 𝑥) = -𝑥) |
105 | 103, 104 | syl5eq 2656 |
. . . . . . . . . . . . . . 15
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((i
· i) · 𝑥) =
-𝑥) |
106 | 101, 105 | eqtrd 2644 |
. . . . . . . . . . . . . 14
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((i
· 𝑥) · i) =
-𝑥) |
107 | 100, 106 | oveq12d 6567 |
. . . . . . . . . . . . 13
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1
· i) − ((i · 𝑥) · i)) = (i − -𝑥)) |
108 | | subneg 10209 |
. . . . . . . . . . . . . 14
⊢ ((i
∈ ℂ ∧ 𝑥
∈ ℂ) → (i − -𝑥) = (i + 𝑥)) |
109 | 4, 12, 108 | sylancr 694 |
. . . . . . . . . . . . 13
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (i −
-𝑥) = (i + 𝑥)) |
110 | 98, 107, 109 | 3eqtrd 2648 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1
− (i · 𝑥))
· i) = (i + 𝑥)) |
111 | | addcom 10101 |
. . . . . . . . . . . . 13
⊢ ((i
∈ ℂ ∧ 𝑥
∈ ℂ) → (i + 𝑥) = (𝑥 + i)) |
112 | 4, 12, 111 | sylancr 694 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (i + 𝑥) = (𝑥 + i)) |
113 | 110, 112 | eqtrd 2644 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1
− (i · 𝑥))
· i) = (𝑥 +
i)) |
114 | 113 | oveq2d 6565 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 / ((1
− (i · 𝑥))
· i)) = (1 / (𝑥 +
i))) |
115 | 94, 96, 114 | 3eqtr3d 2652 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 / (1
− (i · 𝑥)))
· (1 / i)) = (1 / (𝑥
+ i))) |
116 | 90, 115 | syl5eqr 2658 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 / (1
− (i · 𝑥)))
· -i) = (1 / (𝑥 +
i))) |
117 | 116 | mpteq2dva 4672 |
. . . . . . 7
⊢ (⊤
→ (𝑥 ∈ 𝑆 ↦ ((1 / (1 − (i
· 𝑥))) · -i))
= (𝑥 ∈ 𝑆 ↦ (1 / (𝑥 + i)))) |
118 | 88, 117 | eqtrd 2644 |
. . . . . 6
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ (log‘(1
− (i · 𝑥)))))
= (𝑥 ∈ 𝑆 ↦ (1 / (𝑥 + i)))) |
119 | | ovex 6577 |
. . . . . . 7
⊢ (1 /
(𝑥 − i)) ∈
V |
120 | 119 | a1i 11 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 /
(𝑥 − i)) ∈
V) |
121 | 28 | simp3bi 1071 |
. . . . . . . . 9
⊢ (𝑥 ∈ 𝑆 → (1 + (i · 𝑥)) ∈ 𝐷) |
122 | 121 | adantl 481 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 + (i
· 𝑥)) ∈ 𝐷) |
123 | 3, 45, 19 | sylancr 694 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ ℂ) → (1 + (i · 𝑥)) ∈ ℂ) |
124 | 2, 48, 49, 51, 45, 52, 58 | dvmptadd 23529 |
. . . . . . . . . 10
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ (1 + (i · 𝑥)))) = (𝑥 ∈ ℂ ↦ (0 +
i))) |
125 | 4 | addid2i 10103 |
. . . . . . . . . . 11
⊢ (0 + i) =
i |
126 | 125 | mpteq2i 4669 |
. . . . . . . . . 10
⊢ (𝑥 ∈ ℂ ↦ (0 + i))
= (𝑥 ∈ ℂ ↦
i) |
127 | 124, 126 | syl6eq 2660 |
. . . . . . . . 9
⊢ (⊤
→ (ℂ D (𝑥 ∈
ℂ ↦ (1 + (i · 𝑥)))) = (𝑥 ∈ ℂ ↦ i)) |
128 | 2, 123, 52, 127, 68, 73, 63, 74 | dvmptres 23532 |
. . . . . . . 8
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ (1 + (i ·
𝑥)))) = (𝑥 ∈ 𝑆 ↦ i)) |
129 | | fveq2 6103 |
. . . . . . . 8
⊢ (𝑦 = (1 + (i · 𝑥)) → (log‘𝑦) = (log‘(1 + (i ·
𝑥)))) |
130 | | oveq2 6557 |
. . . . . . . 8
⊢ (𝑦 = (1 + (i · 𝑥)) → (1 / 𝑦) = (1 / (1 + (i · 𝑥)))) |
131 | 2, 2, 122, 91, 41, 43, 128, 85, 129, 130 | dvmptco 23541 |
. . . . . . 7
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ (log‘(1 +
(i · 𝑥))))) = (𝑥 ∈ 𝑆 ↦ ((1 / (1 + (i · 𝑥))) ·
i))) |
132 | 97, 20, 91, 21, 93 | divdiv2d 10712 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 / ((1 +
(i · 𝑥)) / i)) = ((1
· i) / (1 + (i · 𝑥)))) |
133 | 97, 14, 91, 93 | divdird 10718 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 + (i
· 𝑥)) / i) = ((1 /
i) + ((i · 𝑥) /
i))) |
134 | 89 | a1i 11 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 / i) =
-i) |
135 | 12, 91, 93 | divcan3d 10685 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((i
· 𝑥) / i) = 𝑥) |
136 | 134, 135 | oveq12d 6567 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 / i) +
((i · 𝑥) / i)) = (-i
+ 𝑥)) |
137 | | negicn 10161 |
. . . . . . . . . . . . 13
⊢ -i ∈
ℂ |
138 | | addcom 10101 |
. . . . . . . . . . . . 13
⊢ ((-i
∈ ℂ ∧ 𝑥
∈ ℂ) → (-i + 𝑥) = (𝑥 + -i)) |
139 | 137, 12, 138 | sylancr 694 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (-i +
𝑥) = (𝑥 + -i)) |
140 | | negsub 10208 |
. . . . . . . . . . . . 13
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → (𝑥 + -i) =
(𝑥 −
i)) |
141 | 12, 4, 140 | sylancl 693 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 + -i) = (𝑥 − i)) |
142 | 139, 141 | eqtrd 2644 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (-i +
𝑥) = (𝑥 − i)) |
143 | 133, 136,
142 | 3eqtrd 2648 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 + (i
· 𝑥)) / i) = (𝑥 − i)) |
144 | 143 | oveq2d 6565 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 / ((1 +
(i · 𝑥)) / i)) = (1
/ (𝑥 −
i))) |
145 | 97, 91, 20, 21 | div23d 10717 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1
· i) / (1 + (i · 𝑥))) = ((1 / (1 + (i · 𝑥))) ·
i)) |
146 | 132, 144,
145 | 3eqtr3rd 2653 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 / (1 +
(i · 𝑥))) ·
i) = (1 / (𝑥 −
i))) |
147 | 146 | mpteq2dva 4672 |
. . . . . . 7
⊢ (⊤
→ (𝑥 ∈ 𝑆 ↦ ((1 / (1 + (i ·
𝑥))) · i)) = (𝑥 ∈ 𝑆 ↦ (1 / (𝑥 − i)))) |
148 | 131, 147 | eqtrd 2644 |
. . . . . 6
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ (log‘(1 +
(i · 𝑥))))) = (𝑥 ∈ 𝑆 ↦ (1 / (𝑥 − i)))) |
149 | 2, 18, 27, 118, 22, 120, 148 | dvmptsub 23536 |
. . . . 5
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥)))))) = (𝑥 ∈ 𝑆 ↦ ((1 / (𝑥 + i)) − (1 / (𝑥 − i))))) |
150 | | subcl 10159 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → (𝑥 −
i) ∈ ℂ) |
151 | 12, 4, 150 | sylancl 693 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 − i) ∈
ℂ) |
152 | | addcl 9897 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → (𝑥 + i)
∈ ℂ) |
153 | 12, 4, 152 | sylancl 693 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 + i) ∈
ℂ) |
154 | 12 | sqcld 12868 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥↑2) ∈
ℂ) |
155 | | addcl 9897 |
. . . . . . . . 9
⊢ ((1
∈ ℂ ∧ (𝑥↑2) ∈ ℂ) → (1 + (𝑥↑2)) ∈
ℂ) |
156 | 3, 154, 155 | sylancr 694 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 +
(𝑥↑2)) ∈
ℂ) |
157 | | atandm4 24406 |
. . . . . . . . . 10
⊢ (𝑥 ∈ dom arctan ↔ (𝑥 ∈ ℂ ∧ (1 +
(𝑥↑2)) ≠
0)) |
158 | 157 | simprbi 479 |
. . . . . . . . 9
⊢ (𝑥 ∈ dom arctan → (1 +
(𝑥↑2)) ≠
0) |
159 | 9, 158 | syl 17 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 +
(𝑥↑2)) ≠
0) |
160 | 151, 153,
156, 159 | divsubdird 10719 |
. . . . . . 7
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 − i) − (𝑥 + i)) / (1 + (𝑥↑2))) = (((𝑥 − i) / (1 + (𝑥↑2))) − ((𝑥 + i) / (1 + (𝑥↑2))))) |
161 | 141 | oveq1d 6564 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 + -i) − (𝑥 + i)) = ((𝑥 − i) − (𝑥 + i))) |
162 | 137 | a1i 11 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → -i ∈
ℂ) |
163 | 12, 162, 91 | pnpcand 10308 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 + -i) − (𝑥 + i)) = (-i −
i)) |
164 | 161, 163 | eqtr3d 2646 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) − (𝑥 + i)) = (-i −
i)) |
165 | | 2cn 10968 |
. . . . . . . . . . . 12
⊢ 2 ∈
ℂ |
166 | 165, 4, 92 | divreci 10649 |
. . . . . . . . . . 11
⊢ (2 / i) =
(2 · (1 / i)) |
167 | 89 | oveq2i 6560 |
. . . . . . . . . . 11
⊢ (2
· (1 / i)) = (2 · -i) |
168 | 166, 167 | eqtri 2632 |
. . . . . . . . . 10
⊢ (2 / i) =
(2 · -i) |
169 | 137 | 2timesi 11024 |
. . . . . . . . . 10
⊢ (2
· -i) = (-i + -i) |
170 | 137, 4 | negsubi 10238 |
. . . . . . . . . 10
⊢ (-i + -i)
= (-i − i) |
171 | 168, 169,
170 | 3eqtri 2636 |
. . . . . . . . 9
⊢ (2 / i) =
(-i − i) |
172 | 164, 171 | syl6eqr 2662 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) − (𝑥 + i)) = (2 /
i)) |
173 | 172 | oveq1d 6564 |
. . . . . . 7
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 − i) − (𝑥 + i)) / (1 + (𝑥↑2))) = ((2 / i) / (1 +
(𝑥↑2)))) |
174 | 151 | mulid1d 9936 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) · 1) = (𝑥 − i)) |
175 | 151, 153 | mulcomd 9940 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) · (𝑥 + i)) = ((𝑥 + i) · (𝑥 − i))) |
176 | | i2 12827 |
. . . . . . . . . . . . . 14
⊢
(i↑2) = -1 |
177 | 176 | oveq2i 6560 |
. . . . . . . . . . . . 13
⊢ ((𝑥↑2) − (i↑2)) =
((𝑥↑2) −
-1) |
178 | | subneg 10209 |
. . . . . . . . . . . . . 14
⊢ (((𝑥↑2) ∈ ℂ ∧ 1
∈ ℂ) → ((𝑥↑2) − -1) = ((𝑥↑2) + 1)) |
179 | 154, 3, 178 | sylancl 693 |
. . . . . . . . . . . . 13
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥↑2) − -1) = ((𝑥↑2) + 1)) |
180 | 177, 179 | syl5eq 2656 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥↑2) − (i↑2)) =
((𝑥↑2) +
1)) |
181 | | subsq 12834 |
. . . . . . . . . . . . 13
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → ((𝑥↑2)
− (i↑2)) = ((𝑥 +
i) · (𝑥 −
i))) |
182 | 12, 4, 181 | sylancl 693 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥↑2) − (i↑2)) =
((𝑥 + i) · (𝑥 − i))) |
183 | | addcom 10101 |
. . . . . . . . . . . . 13
⊢ (((𝑥↑2) ∈ ℂ ∧ 1
∈ ℂ) → ((𝑥↑2) + 1) = (1 + (𝑥↑2))) |
184 | 154, 3, 183 | sylancl 693 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥↑2) + 1) = (1 + (𝑥↑2))) |
185 | 180, 182,
184 | 3eqtr3d 2652 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 + i) · (𝑥 − i)) = (1 + (𝑥↑2))) |
186 | 175, 185 | eqtrd 2644 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) · (𝑥 + i)) = (1 + (𝑥↑2))) |
187 | 174, 186 | oveq12d 6567 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 − i) · 1) /
((𝑥 − i) ·
(𝑥 + i))) = ((𝑥 − i) / (1 + (𝑥↑2)))) |
188 | | subneg 10209 |
. . . . . . . . . . . 12
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → (𝑥 −
-i) = (𝑥 +
i)) |
189 | 12, 4, 188 | sylancl 693 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 − -i) = (𝑥 + i)) |
190 | | atandm 24403 |
. . . . . . . . . . . . . 14
⊢ (𝑥 ∈ dom arctan ↔ (𝑥 ∈ ℂ ∧ 𝑥 ≠ -i ∧ 𝑥 ≠ i)) |
191 | 9, 190 | sylib 207 |
. . . . . . . . . . . . 13
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 ∈ ℂ ∧ 𝑥 ≠ -i ∧ 𝑥 ≠ i)) |
192 | 191 | simp2d 1067 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → 𝑥 ≠ -i) |
193 | | subeq0 10186 |
. . . . . . . . . . . . . 14
⊢ ((𝑥 ∈ ℂ ∧ -i ∈
ℂ) → ((𝑥 −
-i) = 0 ↔ 𝑥 =
-i)) |
194 | 193 | necon3bid 2826 |
. . . . . . . . . . . . 13
⊢ ((𝑥 ∈ ℂ ∧ -i ∈
ℂ) → ((𝑥 −
-i) ≠ 0 ↔ 𝑥 ≠
-i)) |
195 | 12, 137, 194 | sylancl 693 |
. . . . . . . . . . . 12
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − -i) ≠ 0 ↔ 𝑥 ≠ -i)) |
196 | 192, 195 | mpbird 246 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 − -i) ≠
0) |
197 | 189, 196 | eqnetrrd 2850 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 + i) ≠ 0) |
198 | 191 | simp3d 1068 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → 𝑥 ≠ i) |
199 | | subeq0 10186 |
. . . . . . . . . . . . 13
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → ((𝑥 −
i) = 0 ↔ 𝑥 =
i)) |
200 | 199 | necon3bid 2826 |
. . . . . . . . . . . 12
⊢ ((𝑥 ∈ ℂ ∧ i ∈
ℂ) → ((𝑥 −
i) ≠ 0 ↔ 𝑥 ≠
i)) |
201 | 12, 4, 200 | sylancl 693 |
. . . . . . . . . . 11
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) ≠ 0 ↔ 𝑥 ≠ i)) |
202 | 198, 201 | mpbird 246 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (𝑥 − i) ≠
0) |
203 | 97, 153, 151, 197, 202 | divcan5d 10706 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 − i) · 1) /
((𝑥 − i) ·
(𝑥 + i))) = (1 / (𝑥 + i))) |
204 | 187, 203 | eqtr3d 2646 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 − i) / (1 + (𝑥↑2))) = (1 / (𝑥 + i))) |
205 | 153 | mulid1d 9936 |
. . . . . . . . . 10
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 + i) · 1) = (𝑥 + i)) |
206 | 205, 185 | oveq12d 6567 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 + i) · 1) / ((𝑥 + i) · (𝑥 − i))) = ((𝑥 + i) / (1 + (𝑥↑2)))) |
207 | 97, 151, 153, 202, 197 | divcan5d 10706 |
. . . . . . . . 9
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 + i) · 1) / ((𝑥 + i) · (𝑥 − i))) = (1 / (𝑥 − i))) |
208 | 206, 207 | eqtr3d 2646 |
. . . . . . . 8
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((𝑥 + i) / (1 + (𝑥↑2))) = (1 / (𝑥 − i))) |
209 | 204, 208 | oveq12d 6567 |
. . . . . . 7
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((𝑥 − i) / (1 + (𝑥↑2))) − ((𝑥 + i) / (1 + (𝑥↑2)))) = ((1 / (𝑥 + i)) − (1 / (𝑥 − i)))) |
210 | 160, 173,
209 | 3eqtr3rd 2653 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → ((1 /
(𝑥 + i)) − (1 /
(𝑥 − i))) = ((2 / i)
/ (1 + (𝑥↑2)))) |
211 | 210 | mpteq2dva 4672 |
. . . . 5
⊢ (⊤
→ (𝑥 ∈ 𝑆 ↦ ((1 / (𝑥 + i)) − (1 / (𝑥 − i)))) = (𝑥 ∈ 𝑆 ↦ ((2 / i) / (1 + (𝑥↑2))))) |
212 | 149, 211 | eqtrd 2644 |
. . . 4
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥)))))) = (𝑥 ∈ 𝑆 ↦ ((2 / i) / (1 + (𝑥↑2))))) |
213 | | halfcl 11134 |
. . . . 5
⊢ (i ∈
ℂ → (i / 2) ∈ ℂ) |
214 | 4, 213 | mp1i 13 |
. . . 4
⊢ (⊤
→ (i / 2) ∈ ℂ) |
215 | 2, 23, 25, 212, 214 | dvmptcmul 23533 |
. . 3
⊢ (⊤
→ (ℂ D (𝑥 ∈
𝑆 ↦ ((i / 2) ·
((log‘(1 − (i · 𝑥))) − (log‘(1 + (i · 𝑥))))))) = (𝑥 ∈ 𝑆 ↦ ((i / 2) · ((2 / i) / (1 +
(𝑥↑2)))))) |
216 | | df-atan 24394 |
. . . . . . 7
⊢ arctan =
(𝑥 ∈ (ℂ ∖
{-i, i}) ↦ ((i / 2) · ((log‘(1 − (i · 𝑥))) − (log‘(1 + (i
· 𝑥)))))) |
217 | 216 | reseq1i 5313 |
. . . . . 6
⊢ (arctan
↾ 𝑆) = ((𝑥 ∈ (ℂ ∖ {-i,
i}) ↦ ((i / 2) · ((log‘(1 − (i · 𝑥))) − (log‘(1 + (i
· 𝑥)))))) ↾
𝑆) |
218 | | atanf 24407 |
. . . . . . . . 9
⊢
arctan:(ℂ ∖ {-i, i})⟶ℂ |
219 | 218 | fdmi 5965 |
. . . . . . . 8
⊢ dom
arctan = (ℂ ∖ {-i, i}) |
220 | 7, 219 | sseqtri 3600 |
. . . . . . 7
⊢ 𝑆 ⊆ (ℂ ∖ {-i,
i}) |
221 | | resmpt 5369 |
. . . . . . 7
⊢ (𝑆 ⊆ (ℂ ∖ {-i,
i}) → ((𝑥 ∈
(ℂ ∖ {-i, i}) ↦ ((i / 2) · ((log‘(1 − (i
· 𝑥))) −
(log‘(1 + (i · 𝑥)))))) ↾ 𝑆) = (𝑥 ∈ 𝑆 ↦ ((i / 2) · ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥))))))) |
222 | 220, 221 | ax-mp 5 |
. . . . . 6
⊢ ((𝑥 ∈ (ℂ ∖ {-i,
i}) ↦ ((i / 2) · ((log‘(1 − (i · 𝑥))) − (log‘(1 + (i
· 𝑥)))))) ↾
𝑆) = (𝑥 ∈ 𝑆 ↦ ((i / 2) · ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥)))))) |
223 | 217, 222 | eqtri 2632 |
. . . . 5
⊢ (arctan
↾ 𝑆) = (𝑥 ∈ 𝑆 ↦ ((i / 2) · ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥)))))) |
224 | 223 | a1i 11 |
. . . 4
⊢ (⊤
→ (arctan ↾ 𝑆) =
(𝑥 ∈ 𝑆 ↦ ((i / 2) · ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥))))))) |
225 | 224 | oveq2d 6565 |
. . 3
⊢ (⊤
→ (ℂ D (arctan ↾ 𝑆)) = (ℂ D (𝑥 ∈ 𝑆 ↦ ((i / 2) · ((log‘(1
− (i · 𝑥)))
− (log‘(1 + (i · 𝑥)))))))) |
226 | | 2ne0 10990 |
. . . . . . 7
⊢ 2 ≠
0 |
227 | | divcan6 10611 |
. . . . . . 7
⊢ (((i
∈ ℂ ∧ i ≠ 0) ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) →
((i / 2) · (2 / i)) = 1) |
228 | 4, 92, 165, 226, 227 | mp4an 705 |
. . . . . 6
⊢ ((i / 2)
· (2 / i)) = 1 |
229 | 228 | oveq1i 6559 |
. . . . 5
⊢ (((i / 2)
· (2 / i)) / (1 + (𝑥↑2))) = (1 / (1 + (𝑥↑2))) |
230 | 4, 213 | mp1i 13 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (i / 2)
∈ ℂ) |
231 | 165, 4, 92 | divcli 10646 |
. . . . . . 7
⊢ (2 / i)
∈ ℂ |
232 | 231 | a1i 11 |
. . . . . 6
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (2 / i)
∈ ℂ) |
233 | 230, 232,
156, 159 | divassd 10715 |
. . . . 5
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (((i / 2)
· (2 / i)) / (1 + (𝑥↑2))) = ((i / 2) · ((2 / i) / (1
+ (𝑥↑2))))) |
234 | 229, 233 | syl5eqr 2658 |
. . . 4
⊢
((⊤ ∧ 𝑥
∈ 𝑆) → (1 / (1 +
(𝑥↑2))) = ((i / 2)
· ((2 / i) / (1 + (𝑥↑2))))) |
235 | 234 | mpteq2dva 4672 |
. . 3
⊢ (⊤
→ (𝑥 ∈ 𝑆 ↦ (1 / (1 + (𝑥↑2)))) = (𝑥 ∈ 𝑆 ↦ ((i / 2) · ((2 / i) / (1 +
(𝑥↑2)))))) |
236 | 215, 225,
235 | 3eqtr4d 2654 |
. 2
⊢ (⊤
→ (ℂ D (arctan ↾ 𝑆)) = (𝑥 ∈ 𝑆 ↦ (1 / (1 + (𝑥↑2))))) |
237 | 236 | trud 1484 |
1
⊢ (ℂ
D (arctan ↾ 𝑆)) =
(𝑥 ∈ 𝑆 ↦ (1 / (1 + (𝑥↑2)))) |