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Description: Lemma for atanlogsub . (Contributed by Mario Carneiro, 4-Apr-2015)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | atanlogsublem | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 1 + ( i · 𝐴 ) ) ) − ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) ) ∈ ( - π (,) π ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-1cn | ⊢ 1 ∈ ℂ | |
| 2 | ax-icn | ⊢ i ∈ ℂ | |
| 3 | atandm2 | ⊢ ( 𝐴 ∈ dom arctan ↔ ( 𝐴 ∈ ℂ ∧ ( 1 − ( i · 𝐴 ) ) ≠ 0 ∧ ( 1 + ( i · 𝐴 ) ) ≠ 0 ) ) | |
| 4 | 3 | birani | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 𝐴 ∈ ℂ ∧ ( 1 − ( i · 𝐴 ) ) ≠ 0 ∧ ( 1 + ( i · 𝐴 ) ) ≠ 0 ) ) |
| 5 | 4 | simp1d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 𝐴 ∈ ℂ ) |
| 6 | mulcl | ⊢ ( ( i ∈ ℂ ∧ 𝐴 ∈ ℂ ) → ( i · 𝐴 ) ∈ ℂ ) | |
| 7 | 2 5 6 | sylancr | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · 𝐴 ) ∈ ℂ ) |
| 8 | addcl | ⊢ ( ( 1 ∈ ℂ ∧ ( i · 𝐴 ) ∈ ℂ ) → ( 1 + ( i · 𝐴 ) ) ∈ ℂ ) | |
| 9 | 1 7 8 | sylancr | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 1 + ( i · 𝐴 ) ) ∈ ℂ ) |
| 10 | 4 | simp3d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 1 + ( i · 𝐴 ) ) ≠ 0 ) |
| 11 | 9 10 | logcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( 1 + ( i · 𝐴 ) ) ) ∈ ℂ ) |
| 12 | subcl | ⊢ ( ( 1 ∈ ℂ ∧ ( i · 𝐴 ) ∈ ℂ ) → ( 1 − ( i · 𝐴 ) ) ∈ ℂ ) | |
| 13 | 1 7 12 | sylancr | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 1 − ( i · 𝐴 ) ) ∈ ℂ ) |
| 14 | 4 | simp2d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 1 − ( i · 𝐴 ) ) ≠ 0 ) |
| 15 | 13 14 | logcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ∈ ℂ ) |
| 16 | 11 15 | imsubd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 1 + ( i · 𝐴 ) ) ) − ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 1 + ( i · 𝐴 ) ) ) ) − ( ℑ ‘ ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) ) ) |
| 17 | 2 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → i ∈ ℂ ) |
| 18 | 17 5 17 | subdid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · ( 𝐴 − i ) ) = ( ( i · 𝐴 ) − ( i · i ) ) ) |
| 19 | ixi | ⊢ ( i · i ) = - 1 | |
| 20 | 19 | oveq2i | ⊢ ( ( i · 𝐴 ) − ( i · i ) ) = ( ( i · 𝐴 ) − - 1 ) |
| 21 | subneg | ⊢ ( ( ( i · 𝐴 ) ∈ ℂ ∧ 1 ∈ ℂ ) → ( ( i · 𝐴 ) − - 1 ) = ( ( i · 𝐴 ) + 1 ) ) | |
| 22 | 7 1 21 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( i · 𝐴 ) − - 1 ) = ( ( i · 𝐴 ) + 1 ) ) |
| 23 | 20 22 | eqtrid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( i · 𝐴 ) − ( i · i ) ) = ( ( i · 𝐴 ) + 1 ) ) |
| 24 | addcom | ⊢ ( ( ( i · 𝐴 ) ∈ ℂ ∧ 1 ∈ ℂ ) → ( ( i · 𝐴 ) + 1 ) = ( 1 + ( i · 𝐴 ) ) ) | |
| 25 | 7 1 24 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( i · 𝐴 ) + 1 ) = ( 1 + ( i · 𝐴 ) ) ) |
| 26 | 18 23 25 | 3eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · ( 𝐴 − i ) ) = ( 1 + ( i · 𝐴 ) ) ) |
| 27 | 26 | fveq2d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( i · ( 𝐴 − i ) ) ) = ( log ‘ ( 1 + ( i · 𝐴 ) ) ) ) |
| 28 | subcl | ⊢ ( ( 𝐴 ∈ ℂ ∧ i ∈ ℂ ) → ( 𝐴 − i ) ∈ ℂ ) | |
| 29 | 5 2 28 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 𝐴 − i ) ∈ ℂ ) |
| 30 | resub | ⊢ ( ( 𝐴 ∈ ℂ ∧ i ∈ ℂ ) → ( ℜ ‘ ( 𝐴 − i ) ) = ( ( ℜ ‘ 𝐴 ) − ( ℜ ‘ i ) ) ) | |
| 31 | 5 2 30 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 − i ) ) = ( ( ℜ ‘ 𝐴 ) − ( ℜ ‘ i ) ) ) |
| 32 | rei | ⊢ ( ℜ ‘ i ) = 0 | |
| 33 | 32 | oveq2i | ⊢ ( ( ℜ ‘ 𝐴 ) − ( ℜ ‘ i ) ) = ( ( ℜ ‘ 𝐴 ) − 0 ) |
| 34 | 5 | recld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ 𝐴 ) ∈ ℝ ) |
| 35 | 34 | recnd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ 𝐴 ) ∈ ℂ ) |
| 36 | 35 | subid1d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℜ ‘ 𝐴 ) − 0 ) = ( ℜ ‘ 𝐴 ) ) |
| 37 | 33 36 | eqtrid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℜ ‘ 𝐴 ) − ( ℜ ‘ i ) ) = ( ℜ ‘ 𝐴 ) ) |
| 38 | 31 37 | eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 − i ) ) = ( ℜ ‘ 𝐴 ) ) |
| 39 | gt0ne0 | ⊢ ( ( ( ℜ ‘ 𝐴 ) ∈ ℝ ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ 𝐴 ) ≠ 0 ) | |
| 40 | 34 39 | sylancom | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ 𝐴 ) ≠ 0 ) |
| 41 | 38 40 | eqnetrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 − i ) ) ≠ 0 ) |
| 42 | fveq2 | ⊢ ( ( 𝐴 − i ) = 0 → ( ℜ ‘ ( 𝐴 − i ) ) = ( ℜ ‘ 0 ) ) | |
| 43 | re0 | ⊢ ( ℜ ‘ 0 ) = 0 | |
| 44 | 42 43 | eqtrdi | ⊢ ( ( 𝐴 − i ) = 0 → ( ℜ ‘ ( 𝐴 − i ) ) = 0 ) |
| 45 | 44 | necon3i | ⊢ ( ( ℜ ‘ ( 𝐴 − i ) ) ≠ 0 → ( 𝐴 − i ) ≠ 0 ) |
| 46 | 41 45 | syl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 𝐴 − i ) ≠ 0 ) |
| 47 | simpr | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 < ( ℜ ‘ 𝐴 ) ) | |
| 48 | 0re | ⊢ 0 ∈ ℝ | |
| 49 | ltle | ⊢ ( ( 0 ∈ ℝ ∧ ( ℜ ‘ 𝐴 ) ∈ ℝ ) → ( 0 < ( ℜ ‘ 𝐴 ) → 0 ≤ ( ℜ ‘ 𝐴 ) ) ) | |
| 50 | 48 34 49 | sylancr | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 0 < ( ℜ ‘ 𝐴 ) → 0 ≤ ( ℜ ‘ 𝐴 ) ) ) |
| 51 | 47 50 | mpd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 ≤ ( ℜ ‘ 𝐴 ) ) |
| 52 | 51 38 | breqtrrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 ≤ ( ℜ ‘ ( 𝐴 − i ) ) ) |
| 53 | logimul | ⊢ ( ( ( 𝐴 − i ) ∈ ℂ ∧ ( 𝐴 − i ) ≠ 0 ∧ 0 ≤ ( ℜ ‘ ( 𝐴 − i ) ) ) → ( log ‘ ( i · ( 𝐴 − i ) ) ) = ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) | |
| 54 | 29 46 52 53 | syl3anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( i · ( 𝐴 − i ) ) ) = ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) |
| 55 | 27 54 | eqtr3d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( 1 + ( i · 𝐴 ) ) ) = ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) |
| 56 | 55 | fveq2d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 1 + ( i · 𝐴 ) ) ) ) = ( ℑ ‘ ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) ) |
| 57 | 29 46 | logcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( 𝐴 − i ) ) ∈ ℂ ) |
| 58 | halfpire | ⊢ ( π / 2 ) ∈ ℝ | |
| 59 | 58 | recni | ⊢ ( π / 2 ) ∈ ℂ |
| 60 | 2 59 | mulcli | ⊢ ( i · ( π / 2 ) ) ∈ ℂ |
| 61 | imadd | ⊢ ( ( ( log ‘ ( 𝐴 − i ) ) ∈ ℂ ∧ ( i · ( π / 2 ) ) ∈ ℂ ) → ( ℑ ‘ ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( ℑ ‘ ( i · ( π / 2 ) ) ) ) ) | |
| 62 | 57 60 61 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( ℑ ‘ ( i · ( π / 2 ) ) ) ) ) |
| 63 | reim | ⊢ ( ( π / 2 ) ∈ ℂ → ( ℜ ‘ ( π / 2 ) ) = ( ℑ ‘ ( i · ( π / 2 ) ) ) ) | |
| 64 | 59 63 | ax-mp | ⊢ ( ℜ ‘ ( π / 2 ) ) = ( ℑ ‘ ( i · ( π / 2 ) ) ) |
| 65 | rere | ⊢ ( ( π / 2 ) ∈ ℝ → ( ℜ ‘ ( π / 2 ) ) = ( π / 2 ) ) | |
| 66 | 58 65 | ax-mp | ⊢ ( ℜ ‘ ( π / 2 ) ) = ( π / 2 ) |
| 67 | 64 66 | eqtr3i | ⊢ ( ℑ ‘ ( i · ( π / 2 ) ) ) = ( π / 2 ) |
| 68 | 67 | oveq2i | ⊢ ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( ℑ ‘ ( i · ( π / 2 ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( π / 2 ) ) |
| 69 | 62 68 | eqtrdi | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 𝐴 − i ) ) + ( i · ( π / 2 ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( π / 2 ) ) ) |
| 70 | 56 69 | eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 1 + ( i · 𝐴 ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( π / 2 ) ) ) |
| 71 | addcl | ⊢ ( ( 𝐴 ∈ ℂ ∧ i ∈ ℂ ) → ( 𝐴 + i ) ∈ ℂ ) | |
| 72 | 5 2 71 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 𝐴 + i ) ∈ ℂ ) |
| 73 | mulcl | ⊢ ( ( i ∈ ℂ ∧ ( 𝐴 + i ) ∈ ℂ ) → ( i · ( 𝐴 + i ) ) ∈ ℂ ) | |
| 74 | 2 72 73 | sylancr | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · ( 𝐴 + i ) ) ∈ ℂ ) |
| 75 | reim | ⊢ ( ( 𝐴 + i ) ∈ ℂ → ( ℜ ‘ ( 𝐴 + i ) ) = ( ℑ ‘ ( i · ( 𝐴 + i ) ) ) ) | |
| 76 | 72 75 | syl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 + i ) ) = ( ℑ ‘ ( i · ( 𝐴 + i ) ) ) ) |
| 77 | readd | ⊢ ( ( 𝐴 ∈ ℂ ∧ i ∈ ℂ ) → ( ℜ ‘ ( 𝐴 + i ) ) = ( ( ℜ ‘ 𝐴 ) + ( ℜ ‘ i ) ) ) | |
| 78 | 5 2 77 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 + i ) ) = ( ( ℜ ‘ 𝐴 ) + ( ℜ ‘ i ) ) ) |
| 79 | 32 | oveq2i | ⊢ ( ( ℜ ‘ 𝐴 ) + ( ℜ ‘ i ) ) = ( ( ℜ ‘ 𝐴 ) + 0 ) |
| 80 | 35 | addridd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℜ ‘ 𝐴 ) + 0 ) = ( ℜ ‘ 𝐴 ) ) |
| 81 | 79 80 | eqtrid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℜ ‘ 𝐴 ) + ( ℜ ‘ i ) ) = ( ℜ ‘ 𝐴 ) ) |
| 82 | 78 81 | eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 + i ) ) = ( ℜ ‘ 𝐴 ) ) |
| 83 | 76 82 | eqtr3d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( i · ( 𝐴 + i ) ) ) = ( ℜ ‘ 𝐴 ) ) |
| 84 | 47 83 | breqtrrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 < ( ℑ ‘ ( i · ( 𝐴 + i ) ) ) ) |
| 85 | logneg2 | ⊢ ( ( ( i · ( 𝐴 + i ) ) ∈ ℂ ∧ 0 < ( ℑ ‘ ( i · ( 𝐴 + i ) ) ) ) → ( log ‘ - ( i · ( 𝐴 + i ) ) ) = ( ( log ‘ ( i · ( 𝐴 + i ) ) ) − ( i · π ) ) ) | |
| 86 | 74 84 85 | syl2anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ - ( i · ( 𝐴 + i ) ) ) = ( ( log ‘ ( i · ( 𝐴 + i ) ) ) − ( i · π ) ) ) |
| 87 | 17 5 17 | adddid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · ( 𝐴 + i ) ) = ( ( i · 𝐴 ) + ( i · i ) ) ) |
| 88 | 19 | oveq2i | ⊢ ( ( i · 𝐴 ) + ( i · i ) ) = ( ( i · 𝐴 ) + - 1 ) |
| 89 | negsub | ⊢ ( ( ( i · 𝐴 ) ∈ ℂ ∧ 1 ∈ ℂ ) → ( ( i · 𝐴 ) + - 1 ) = ( ( i · 𝐴 ) − 1 ) ) | |
| 90 | 7 1 89 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( i · 𝐴 ) + - 1 ) = ( ( i · 𝐴 ) − 1 ) ) |
| 91 | 88 90 | eqtrid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( i · 𝐴 ) + ( i · i ) ) = ( ( i · 𝐴 ) − 1 ) ) |
| 92 | 87 91 | eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · ( 𝐴 + i ) ) = ( ( i · 𝐴 ) − 1 ) ) |
| 93 | 92 | negeqd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - ( i · ( 𝐴 + i ) ) = - ( ( i · 𝐴 ) − 1 ) ) |
| 94 | negsubdi2 | ⊢ ( ( ( i · 𝐴 ) ∈ ℂ ∧ 1 ∈ ℂ ) → - ( ( i · 𝐴 ) − 1 ) = ( 1 − ( i · 𝐴 ) ) ) | |
| 95 | 7 1 94 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - ( ( i · 𝐴 ) − 1 ) = ( 1 − ( i · 𝐴 ) ) ) |
| 96 | 93 95 | eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - ( i · ( 𝐴 + i ) ) = ( 1 − ( i · 𝐴 ) ) ) |
| 97 | 96 | fveq2d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ - ( i · ( 𝐴 + i ) ) ) = ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) |
| 98 | 82 40 | eqnetrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℜ ‘ ( 𝐴 + i ) ) ≠ 0 ) |
| 99 | fveq2 | ⊢ ( ( 𝐴 + i ) = 0 → ( ℜ ‘ ( 𝐴 + i ) ) = ( ℜ ‘ 0 ) ) | |
| 100 | 99 43 | eqtrdi | ⊢ ( ( 𝐴 + i ) = 0 → ( ℜ ‘ ( 𝐴 + i ) ) = 0 ) |
| 101 | 100 | necon3i | ⊢ ( ( ℜ ‘ ( 𝐴 + i ) ) ≠ 0 → ( 𝐴 + i ) ≠ 0 ) |
| 102 | 98 101 | syl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 𝐴 + i ) ≠ 0 ) |
| 103 | 72 102 | logcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( 𝐴 + i ) ) ∈ ℂ ) |
| 104 | 60 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · ( π / 2 ) ) ∈ ℂ ) |
| 105 | picn | ⊢ π ∈ ℂ | |
| 106 | 2 105 | mulcli | ⊢ ( i · π ) ∈ ℂ |
| 107 | 106 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( i · π ) ∈ ℂ ) |
| 108 | 51 82 | breqtrrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 ≤ ( ℜ ‘ ( 𝐴 + i ) ) ) |
| 109 | logimul | ⊢ ( ( ( 𝐴 + i ) ∈ ℂ ∧ ( 𝐴 + i ) ≠ 0 ∧ 0 ≤ ( ℜ ‘ ( 𝐴 + i ) ) ) → ( log ‘ ( i · ( 𝐴 + i ) ) ) = ( ( log ‘ ( 𝐴 + i ) ) + ( i · ( π / 2 ) ) ) ) | |
| 110 | 72 102 108 109 | syl3anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( i · ( 𝐴 + i ) ) ) = ( ( log ‘ ( 𝐴 + i ) ) + ( i · ( π / 2 ) ) ) ) |
| 111 | 110 | oveq1d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( log ‘ ( i · ( 𝐴 + i ) ) ) − ( i · π ) ) = ( ( ( log ‘ ( 𝐴 + i ) ) + ( i · ( π / 2 ) ) ) − ( i · π ) ) ) |
| 112 | 103 104 107 111 | assraddsubd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( log ‘ ( i · ( 𝐴 + i ) ) ) − ( i · π ) ) = ( ( log ‘ ( 𝐴 + i ) ) + ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) |
| 113 | 86 97 112 | 3eqtr3d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( log ‘ ( 1 − ( i · 𝐴 ) ) ) = ( ( log ‘ ( 𝐴 + i ) ) + ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) |
| 114 | 113 | fveq2d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) = ( ℑ ‘ ( ( log ‘ ( 𝐴 + i ) ) + ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) ) |
| 115 | 60 106 | subcli | ⊢ ( ( i · ( π / 2 ) ) − ( i · π ) ) ∈ ℂ |
| 116 | imadd | ⊢ ( ( ( log ‘ ( 𝐴 + i ) ) ∈ ℂ ∧ ( ( i · ( π / 2 ) ) − ( i · π ) ) ∈ ℂ ) → ( ℑ ‘ ( ( log ‘ ( 𝐴 + i ) ) + ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + ( ℑ ‘ ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) ) | |
| 117 | 103 115 116 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 𝐴 + i ) ) + ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + ( ℑ ‘ ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) ) |
| 118 | imsub | ⊢ ( ( ( i · ( π / 2 ) ) ∈ ℂ ∧ ( i · π ) ∈ ℂ ) → ( ℑ ‘ ( ( i · ( π / 2 ) ) − ( i · π ) ) ) = ( ( ℑ ‘ ( i · ( π / 2 ) ) ) − ( ℑ ‘ ( i · π ) ) ) ) | |
| 119 | 60 106 118 | mp2an | ⊢ ( ℑ ‘ ( ( i · ( π / 2 ) ) − ( i · π ) ) ) = ( ( ℑ ‘ ( i · ( π / 2 ) ) ) − ( ℑ ‘ ( i · π ) ) ) |
| 120 | reim | ⊢ ( π ∈ ℂ → ( ℜ ‘ π ) = ( ℑ ‘ ( i · π ) ) ) | |
| 121 | 105 120 | ax-mp | ⊢ ( ℜ ‘ π ) = ( ℑ ‘ ( i · π ) ) |
| 122 | pire | ⊢ π ∈ ℝ | |
| 123 | rere | ⊢ ( π ∈ ℝ → ( ℜ ‘ π ) = π ) | |
| 124 | 122 123 | ax-mp | ⊢ ( ℜ ‘ π ) = π |
| 125 | 121 124 | eqtr3i | ⊢ ( ℑ ‘ ( i · π ) ) = π |
| 126 | 67 125 | oveq12i | ⊢ ( ( ℑ ‘ ( i · ( π / 2 ) ) ) − ( ℑ ‘ ( i · π ) ) ) = ( ( π / 2 ) − π ) |
| 127 | 59 | negcli | ⊢ - ( π / 2 ) ∈ ℂ |
| 128 | 105 59 | negsubi | ⊢ ( π + - ( π / 2 ) ) = ( π − ( π / 2 ) ) |
| 129 | pidiv2halves | ⊢ ( ( π / 2 ) + ( π / 2 ) ) = π | |
| 130 | 105 59 59 129 | subaddrii | ⊢ ( π − ( π / 2 ) ) = ( π / 2 ) |
| 131 | 128 130 | eqtri | ⊢ ( π + - ( π / 2 ) ) = ( π / 2 ) |
| 132 | 59 105 127 131 | subaddrii | ⊢ ( ( π / 2 ) − π ) = - ( π / 2 ) |
| 133 | 119 126 132 | 3eqtri | ⊢ ( ℑ ‘ ( ( i · ( π / 2 ) ) − ( i · π ) ) ) = - ( π / 2 ) |
| 134 | 133 | oveq2i | ⊢ ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + ( ℑ ‘ ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + - ( π / 2 ) ) |
| 135 | 117 134 | eqtrdi | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 𝐴 + i ) ) + ( ( i · ( π / 2 ) ) − ( i · π ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + - ( π / 2 ) ) ) |
| 136 | 114 135 | eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + - ( π / 2 ) ) ) |
| 137 | 70 136 | oveq12d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( log ‘ ( 1 + ( i · 𝐴 ) ) ) ) − ( ℑ ‘ ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) ) = ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( π / 2 ) ) − ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + - ( π / 2 ) ) ) ) |
| 138 | 57 | imcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ∈ ℝ ) |
| 139 | 138 | recnd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ∈ ℂ ) |
| 140 | 59 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( π / 2 ) ∈ ℂ ) |
| 141 | 103 | imcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ℝ ) |
| 142 | 141 | recnd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ℂ ) |
| 143 | 127 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - ( π / 2 ) ∈ ℂ ) |
| 144 | 139 140 142 143 | addsub4d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( π / 2 ) ) − ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + - ( π / 2 ) ) ) = ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + ( ( π / 2 ) − - ( π / 2 ) ) ) ) |
| 145 | 59 59 | subnegi | ⊢ ( ( π / 2 ) − - ( π / 2 ) ) = ( ( π / 2 ) + ( π / 2 ) ) |
| 146 | 145 129 | eqtri | ⊢ ( ( π / 2 ) − - ( π / 2 ) ) = π |
| 147 | 146 | oveq2i | ⊢ ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + ( ( π / 2 ) − - ( π / 2 ) ) ) = ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) |
| 148 | 144 147 | eqtrdi | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + ( π / 2 ) ) − ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) + - ( π / 2 ) ) ) = ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ) |
| 149 | 16 137 148 | 3eqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 1 + ( i · 𝐴 ) ) ) − ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) ) = ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ) |
| 150 | 138 141 | resubcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ∈ ℝ ) |
| 151 | readdcl | ⊢ ( ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ∈ ℝ ∧ π ∈ ℝ ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ℝ ) | |
| 152 | 150 122 151 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ℝ ) |
| 153 | 122 | renegcli | ⊢ - π ∈ ℝ |
| 154 | 153 | recni | ⊢ - π ∈ ℂ |
| 155 | 154 105 | negsubi | ⊢ ( - π + - π ) = ( - π − π ) |
| 156 | 153 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - π ∈ ℝ ) |
| 157 | 141 | renegcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ℝ ) |
| 158 | 29 46 | logimcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( - π < ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ∧ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ≤ π ) ) |
| 159 | 158 | simpld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - π < ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ) |
| 160 | 72 102 | logimcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( - π < ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∧ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ≤ π ) ) |
| 161 | 160 | simprd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ≤ π ) |
| 162 | leneg | ⊢ ( ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ℝ ∧ π ∈ ℝ ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ≤ π ↔ - π ≤ - ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) | |
| 163 | 141 122 162 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ≤ π ↔ - π ≤ - ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 164 | 161 163 | mpbid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - π ≤ - ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) |
| 165 | 156 156 138 157 159 164 | ltleaddd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( - π + - π ) < ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + - ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 166 | 139 142 | negsubd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) + - ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) = ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 167 | 165 166 | breqtrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( - π + - π ) < ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 168 | 155 167 | eqbrtrrid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( - π − π ) < ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 169 | 122 | a1i | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → π ∈ ℝ ) |
| 170 | 156 169 150 | ltsubaddd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( - π − π ) < ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ↔ - π < ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ) ) |
| 171 | 168 170 | mpbid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → - π < ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ) |
| 172 | 0red | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 ∈ ℝ ) | |
| 173 | 5 | imcld | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ 𝐴 ) ∈ ℝ ) |
| 174 | peano2rem | ⊢ ( ( ℑ ‘ 𝐴 ) ∈ ℝ → ( ( ℑ ‘ 𝐴 ) − 1 ) ∈ ℝ ) | |
| 175 | 173 174 | syl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ 𝐴 ) − 1 ) ∈ ℝ ) |
| 176 | peano2re | ⊢ ( ( ℑ ‘ 𝐴 ) ∈ ℝ → ( ( ℑ ‘ 𝐴 ) + 1 ) ∈ ℝ ) | |
| 177 | 173 176 | syl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ 𝐴 ) + 1 ) ∈ ℝ ) |
| 178 | 173 | ltm1d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ 𝐴 ) − 1 ) < ( ℑ ‘ 𝐴 ) ) |
| 179 | 173 | ltp1d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ 𝐴 ) < ( ( ℑ ‘ 𝐴 ) + 1 ) ) |
| 180 | 175 173 177 178 179 | lttrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ 𝐴 ) − 1 ) < ( ( ℑ ‘ 𝐴 ) + 1 ) ) |
| 181 | ltdiv1 | ⊢ ( ( ( ( ℑ ‘ 𝐴 ) − 1 ) ∈ ℝ ∧ ( ( ℑ ‘ 𝐴 ) + 1 ) ∈ ℝ ∧ ( ( ℜ ‘ 𝐴 ) ∈ ℝ ∧ 0 < ( ℜ ‘ 𝐴 ) ) ) → ( ( ( ℑ ‘ 𝐴 ) − 1 ) < ( ( ℑ ‘ 𝐴 ) + 1 ) ↔ ( ( ( ℑ ‘ 𝐴 ) − 1 ) / ( ℜ ‘ 𝐴 ) ) < ( ( ( ℑ ‘ 𝐴 ) + 1 ) / ( ℜ ‘ 𝐴 ) ) ) ) | |
| 182 | 175 177 34 47 181 | syl112anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ 𝐴 ) − 1 ) < ( ( ℑ ‘ 𝐴 ) + 1 ) ↔ ( ( ( ℑ ‘ 𝐴 ) − 1 ) / ( ℜ ‘ 𝐴 ) ) < ( ( ( ℑ ‘ 𝐴 ) + 1 ) / ( ℜ ‘ 𝐴 ) ) ) ) |
| 183 | 180 182 | mpbid | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ 𝐴 ) − 1 ) / ( ℜ ‘ 𝐴 ) ) < ( ( ( ℑ ‘ 𝐴 ) + 1 ) / ( ℜ ‘ 𝐴 ) ) ) |
| 184 | imsub | ⊢ ( ( 𝐴 ∈ ℂ ∧ i ∈ ℂ ) → ( ℑ ‘ ( 𝐴 − i ) ) = ( ( ℑ ‘ 𝐴 ) − ( ℑ ‘ i ) ) ) | |
| 185 | 5 2 184 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( 𝐴 − i ) ) = ( ( ℑ ‘ 𝐴 ) − ( ℑ ‘ i ) ) ) |
| 186 | imi | ⊢ ( ℑ ‘ i ) = 1 | |
| 187 | 186 | oveq2i | ⊢ ( ( ℑ ‘ 𝐴 ) − ( ℑ ‘ i ) ) = ( ( ℑ ‘ 𝐴 ) − 1 ) |
| 188 | 185 187 | eqtrdi | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( 𝐴 − i ) ) = ( ( ℑ ‘ 𝐴 ) − 1 ) ) |
| 189 | 188 38 | oveq12d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( 𝐴 − i ) ) / ( ℜ ‘ ( 𝐴 − i ) ) ) = ( ( ( ℑ ‘ 𝐴 ) − 1 ) / ( ℜ ‘ 𝐴 ) ) ) |
| 190 | imadd | ⊢ ( ( 𝐴 ∈ ℂ ∧ i ∈ ℂ ) → ( ℑ ‘ ( 𝐴 + i ) ) = ( ( ℑ ‘ 𝐴 ) + ( ℑ ‘ i ) ) ) | |
| 191 | 5 2 190 | sylancl | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( 𝐴 + i ) ) = ( ( ℑ ‘ 𝐴 ) + ( ℑ ‘ i ) ) ) |
| 192 | 186 | oveq2i | ⊢ ( ( ℑ ‘ 𝐴 ) + ( ℑ ‘ i ) ) = ( ( ℑ ‘ 𝐴 ) + 1 ) |
| 193 | 191 192 | eqtrdi | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( 𝐴 + i ) ) = ( ( ℑ ‘ 𝐴 ) + 1 ) ) |
| 194 | 193 82 | oveq12d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( 𝐴 + i ) ) / ( ℜ ‘ ( 𝐴 + i ) ) ) = ( ( ( ℑ ‘ 𝐴 ) + 1 ) / ( ℜ ‘ 𝐴 ) ) ) |
| 195 | 183 189 194 | 3brtr4d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( 𝐴 − i ) ) / ( ℜ ‘ ( 𝐴 − i ) ) ) < ( ( ℑ ‘ ( 𝐴 + i ) ) / ( ℜ ‘ ( 𝐴 + i ) ) ) ) |
| 196 | tanarg | ⊢ ( ( ( 𝐴 − i ) ∈ ℂ ∧ ( ℜ ‘ ( 𝐴 − i ) ) ≠ 0 ) → ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ) = ( ( ℑ ‘ ( 𝐴 − i ) ) / ( ℜ ‘ ( 𝐴 − i ) ) ) ) | |
| 197 | 29 41 196 | syl2anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ) = ( ( ℑ ‘ ( 𝐴 − i ) ) / ( ℜ ‘ ( 𝐴 − i ) ) ) ) |
| 198 | tanarg | ⊢ ( ( ( 𝐴 + i ) ∈ ℂ ∧ ( ℜ ‘ ( 𝐴 + i ) ) ≠ 0 ) → ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) = ( ( ℑ ‘ ( 𝐴 + i ) ) / ( ℜ ‘ ( 𝐴 + i ) ) ) ) | |
| 199 | 72 98 198 | syl2anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) = ( ( ℑ ‘ ( 𝐴 + i ) ) / ( ℜ ‘ ( 𝐴 + i ) ) ) ) |
| 200 | 195 197 199 | 3brtr4d | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ) < ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 201 | 47 38 | breqtrrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 < ( ℜ ‘ ( 𝐴 − i ) ) ) |
| 202 | argregt0 | ⊢ ( ( ( 𝐴 − i ) ∈ ℂ ∧ 0 < ( ℜ ‘ ( 𝐴 − i ) ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ∈ ( - ( π / 2 ) (,) ( π / 2 ) ) ) | |
| 203 | 29 201 202 | syl2anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ∈ ( - ( π / 2 ) (,) ( π / 2 ) ) ) |
| 204 | 47 82 | breqtrrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → 0 < ( ℜ ‘ ( 𝐴 + i ) ) ) |
| 205 | argregt0 | ⊢ ( ( ( 𝐴 + i ) ∈ ℂ ∧ 0 < ( ℜ ‘ ( 𝐴 + i ) ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ( - ( π / 2 ) (,) ( π / 2 ) ) ) | |
| 206 | 72 204 205 | syl2anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ( - ( π / 2 ) (,) ( π / 2 ) ) ) |
| 207 | tanord | ⊢ ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ∈ ( - ( π / 2 ) (,) ( π / 2 ) ) ∧ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ∈ ( - ( π / 2 ) (,) ( π / 2 ) ) ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) < ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ↔ ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ) < ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) ) | |
| 208 | 203 206 207 | syl2anc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) < ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ↔ ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) ) < ( tan ‘ ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) ) |
| 209 | 200 208 | mpbird | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) < ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) |
| 210 | 142 | addlidd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( 0 + ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) = ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) |
| 211 | 209 210 | breqtrrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) < ( 0 + ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) |
| 212 | 138 141 172 | ltsubaddd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) < 0 ↔ ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) < ( 0 + ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) ) ) |
| 213 | 211 212 | mpbird | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) < 0 ) |
| 214 | 150 172 169 213 | ltadd1dd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) < ( 0 + π ) ) |
| 215 | 105 | addlidi | ⊢ ( 0 + π ) = π |
| 216 | 214 215 | breqtrdi | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) < π ) |
| 217 | 153 | rexri | ⊢ - π ∈ ℝ* |
| 218 | 122 | rexri | ⊢ π ∈ ℝ* |
| 219 | elioo2 | ⊢ ( ( - π ∈ ℝ* ∧ π ∈ ℝ* ) → ( ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ( - π (,) π ) ↔ ( ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ℝ ∧ - π < ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∧ ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) < π ) ) ) | |
| 220 | 217 218 219 | mp2an | ⊢ ( ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ( - π (,) π ) ↔ ( ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ℝ ∧ - π < ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∧ ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) < π ) ) |
| 221 | 152 171 216 220 | syl3anbrc | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ( ( ℑ ‘ ( log ‘ ( 𝐴 − i ) ) ) − ( ℑ ‘ ( log ‘ ( 𝐴 + i ) ) ) ) + π ) ∈ ( - π (,) π ) ) |
| 222 | 149 221 | eqeltrd | ⊢ ( ( 𝐴 ∈ dom arctan ∧ 0 < ( ℜ ‘ 𝐴 ) ) → ( ℑ ‘ ( ( log ‘ ( 1 + ( i · 𝐴 ) ) ) − ( log ‘ ( 1 − ( i · 𝐴 ) ) ) ) ) ∈ ( - π (,) π ) ) |