atancj - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > atancj		Structured version Visualization version GIF version

Theorem atancj 27231

Description: The arctangent function distributes under conjugation. (The condition that ℜ(𝐴) ≠ 0 is necessary because the branch cuts are chosen so that the negative imaginary line "agrees with" neighboring values with negative real part, while the positive imaginary line agrees with values with positive real part. This makes atanneg 27228 true unconditionally but messes up conjugation symmetry, and it is impossible to have both in a single-valued function. The claim is true on the imaginary line between -1 and 1, though.) (Contributed by Mario Carneiro, 31-Mar-2015.)

**Assertion**
Ref	Expression
atancj	⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (𝐴 ∈ dom arctan ∧ (∗‘(arctan‘𝐴)) = (arctan‘(∗‘𝐴))))

**Proof of Theorem atancj**
Step	Hyp	Ref	Expression
1		simpl 488	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ∈ ℂ)
2		simpr 490	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ≠ 0)
3		fveq2 6883	. . . . . 6 ⊢ (𝐴 = -i → (ℜ‘𝐴) = (ℜ‘-i))
4		ax-icn 11252	. . . . . . . 8 ⊢ i ∈ ℂ
5	4	renegi 15340	. . . . . . 7 ⊢ (ℜ‘-i) = -(ℜ‘i)
6		rei 15316	. . . . . . . 8 ⊢ (ℜ‘i) = 0
7	6	negeqi 11543	. . . . . . 7 ⊢ -(ℜ‘i) = -0
8		neg0 11597	. . . . . . 7 ⊢ -0 = 0
9	5, 7, 8	3eqtri 2788	. . . . . 6 ⊢ (ℜ‘-i) = 0
10	3, 9	eqtrdi 2812	. . . . 5 ⊢ (𝐴 = -i → (ℜ‘𝐴) = 0)
11	10	necon3i 2988	. . . 4 ⊢ ((ℜ‘𝐴) ≠ 0 → 𝐴 ≠ -i)
12	2, 11	syl 18	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ≠ -i)
13		fveq2 6883	. . . . . 6 ⊢ (𝐴 = i → (ℜ‘𝐴) = (ℜ‘i))
14	13, 6	eqtrdi 2812	. . . . 5 ⊢ (𝐴 = i → (ℜ‘𝐴) = 0)
15	14	necon3i 2988	. . . 4 ⊢ ((ℜ‘𝐴) ≠ 0 → 𝐴 ≠ i)
16	2, 15	syl 18	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ≠ i)
17		atandm 27197	. . 3 ⊢ (𝐴 ∈ dom arctan ↔ (𝐴 ∈ ℂ ∧ 𝐴 ≠ -i ∧ 𝐴 ≠ i))
18	1, 12, 16, 17	syl3anbrc 1362	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ∈ dom arctan)
19		halfcl 12565	. . . . . 6 ⊢ (i ∈ ℂ → (i / 2) ∈ ℂ)
20	4, 19	ax-mp 5	. . . . 5 ⊢ (i / 2) ∈ ℂ
21		ax-1cn 11251	. . . . . . . 8 ⊢ 1 ∈ ℂ
22		mulcl 11277	. . . . . . . . 9 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
23	4, 1, 22	sylancr 599	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (i · 𝐴) ∈ ℂ)
24		subcl 11549	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (1 − (i · 𝐴)) ∈ ℂ)
25	21, 23, 24	sylancr 599	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · 𝐴)) ∈ ℂ)
26		atandm2 27198	. . . . . . . . 9 ⊢ (𝐴 ∈ dom arctan ↔ (𝐴 ∈ ℂ ∧ (1 − (i · 𝐴)) ≠ 0 ∧ (1 + (i · 𝐴)) ≠ 0))
27	18, 26	sylib 221	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (𝐴 ∈ ℂ ∧ (1 − (i · 𝐴)) ≠ 0 ∧ (1 + (i · 𝐴)) ≠ 0))
28	27	simp2d 1161	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · 𝐴)) ≠ 0)
29	25, 28	logcld 26891	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 − (i · 𝐴))) ∈ ℂ)
30		addcl 11275	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (1 + (i · 𝐴)) ∈ ℂ)
31	21, 23, 30	sylancr 599	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · 𝐴)) ∈ ℂ)
32	27	simp3d 1162	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · 𝐴)) ≠ 0)
33	31, 32	logcld 26891	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 + (i · 𝐴))) ∈ ℂ)
34	29, 33	subcld 11662	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))) ∈ ℂ)
35		cjmul 15302	. . . . 5 ⊢ (((i / 2) ∈ ℂ ∧ ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))) ∈ ℂ) → (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
36	20, 34, 35	sylancr 599	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
37		2ne0 12442	. . . . . . . 8 ⊢ 2 ≠ 0
38		2cn 12411	. . . . . . . . 9 ⊢ 2 ∈ ℂ
39	4, 38	cjdivi 15351	. . . . . . . 8 ⊢ (2 ≠ 0 → (∗‘(i / 2)) = ((∗‘i) / (∗‘2)))
40	37, 39	ax-mp 5	. . . . . . 7 ⊢ (∗‘(i / 2)) = ((∗‘i) / (∗‘2))
41		divneg 12001	. . . . . . . . 9 ⊢ ((i ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → -(i / 2) = (-i / 2))
42	4, 38, 37, 41	mp3an 1490	. . . . . . . 8 ⊢ -(i / 2) = (-i / 2)
43		cji 15319	. . . . . . . . 9 ⊢ (∗‘i) = -i
44		2re 12410	. . . . . . . . . 10 ⊢ 2 ∈ ℝ
45		cjre 15299	. . . . . . . . . 10 ⊢ (2 ∈ ℝ → (∗‘2) = 2)
46	44, 45	ax-mp 5	. . . . . . . . 9 ⊢ (∗‘2) = 2
47	43, 46	oveq12i 7430	. . . . . . . 8 ⊢ ((∗‘i) / (∗‘2)) = (-i / 2)
48	42, 47	eqtr4i 2787	. . . . . . 7 ⊢ -(i / 2) = ((∗‘i) / (∗‘2))
49	40, 48	eqtr4i 2787	. . . . . 6 ⊢ (∗‘(i / 2)) = -(i / 2)
50	49	oveq1i 7428	. . . . 5 ⊢ ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = (-(i / 2) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))))
51	34	cjcld 15356	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) ∈ ℂ)
52		mulneg12 11747	. . . . . 6 ⊢ (((i / 2) ∈ ℂ ∧ (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) ∈ ℂ) → (-(i / 2) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
53	20, 51, 52	sylancr 599	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (-(i / 2) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
54	50, 53	eqtrid 2808	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
55		cjsub 15309	. . . . . . . . 9 ⊢ (((log‘(1 − (i · 𝐴))) ∈ ℂ ∧ (log‘(1 + (i · 𝐴))) ∈ ℂ) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((∗‘(log‘(1 − (i · 𝐴)))) − (∗‘(log‘(1 + (i · 𝐴))))))
56	29, 33, 55	syl2anc 596	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((∗‘(log‘(1 − (i · 𝐴)))) − (∗‘(log‘(1 + (i · 𝐴))))))
57		imsub 15295	. . . . . . . . . . . . . . 15 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(1 − (i · 𝐴))) = ((ℑ‘1) − (ℑ‘(i · 𝐴))))
58	21, 23, 57	sylancr 599	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) = ((ℑ‘1) − (ℑ‘(i · 𝐴))))
59		reim 15269	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
60	59	adantr 486	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
61	60	oveq2d 7434	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((ℑ‘1) − (ℜ‘𝐴)) = ((ℑ‘1) − (ℑ‘(i · 𝐴))))
62	58, 61	eqtr4d 2799	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) = ((ℑ‘1) − (ℜ‘𝐴)))
63		df-neg 11537	. . . . . . . . . . . . . 14 ⊢ -(ℜ‘𝐴) = (0 − (ℜ‘𝐴))
64		im1 15315	. . . . . . . . . . . . . . 15 ⊢ (ℑ‘1) = 0
65	64	oveq1i 7428	. . . . . . . . . . . . . 14 ⊢ ((ℑ‘1) − (ℜ‘𝐴)) = (0 − (ℜ‘𝐴))
66	63, 65	eqtr4i 2787	. . . . . . . . . . . . 13 ⊢ -(ℜ‘𝐴) = ((ℑ‘1) − (ℜ‘𝐴))
67	62, 66	eqtr4di 2814	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) = -(ℜ‘𝐴))
68		recl 15270	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) ∈ ℝ)
69	68	adantr 486	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ∈ ℝ)
70	69	recnd 11330	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ∈ ℂ)
71	70, 2	negne0d 11660	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -(ℜ‘𝐴) ≠ 0)
72	67, 71	eqnetrd 3023	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) ≠ 0)
73		logcj 26927	. . . . . . . . . . 11 ⊢ (((1 − (i · 𝐴)) ∈ ℂ ∧ (ℑ‘(1 − (i · 𝐴))) ≠ 0) → (log‘(∗‘(1 − (i · 𝐴)))) = (∗‘(log‘(1 − (i · 𝐴)))))
74	25, 72, 73	syl2anc 596	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 − (i · 𝐴)))) = (∗‘(log‘(1 − (i · 𝐴)))))
75		cjsub 15309	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (∗‘(1 − (i · 𝐴))) = ((∗‘1) − (∗‘(i · 𝐴))))
76	21, 23, 75	sylancr 599	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 − (i · 𝐴))) = ((∗‘1) − (∗‘(i · 𝐴))))
77		1re 11301	. . . . . . . . . . . . . 14 ⊢ 1 ∈ ℝ
78		cjre 15299	. . . . . . . . . . . . . 14 ⊢ (1 ∈ ℝ → (∗‘1) = 1)
79	77, 78	mp1i 14	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘1) = 1)
80		cjmul 15302	. . . . . . . . . . . . . . 15 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (∗‘(i · 𝐴)) = ((∗‘i) · (∗‘𝐴)))
81	4, 1, 80	sylancr 599	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(i · 𝐴)) = ((∗‘i) · (∗‘𝐴)))
82	43	oveq1i 7428	. . . . . . . . . . . . . . 15 ⊢ ((∗‘i) · (∗‘𝐴)) = (-i · (∗‘𝐴))
83		cjcl 15265	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (∗‘𝐴) ∈ ℂ)
84	83	adantr 486	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘𝐴) ∈ ℂ)
85		mulneg1 11745	. . . . . . . . . . . . . . . 16 ⊢ ((i ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (-i · (∗‘𝐴)) = -(i · (∗‘𝐴)))
86	4, 84, 85	sylancr 599	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (-i · (∗‘𝐴)) = -(i · (∗‘𝐴)))
87	82, 86	eqtrid 2808	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘i) · (∗‘𝐴)) = -(i · (∗‘𝐴)))
88	81, 87	eqtrd 2796	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(i · 𝐴)) = -(i · (∗‘𝐴)))
89	79, 88	oveq12d 7436	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘1) − (∗‘(i · 𝐴))) = (1 − -(i · (∗‘𝐴))))
90		mulcl 11277	. . . . . . . . . . . . . 14 ⊢ ((i ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (i · (∗‘𝐴)) ∈ ℂ)
91	4, 84, 90	sylancr 599	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (i · (∗‘𝐴)) ∈ ℂ)
92		subneg 11600	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 − -(i · (∗‘𝐴))) = (1 + (i · (∗‘𝐴))))
93	21, 91, 92	sylancr 599	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − -(i · (∗‘𝐴))) = (1 + (i · (∗‘𝐴))))
94	76, 89, 93	3eqtrd 2800	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 − (i · 𝐴))) = (1 + (i · (∗‘𝐴))))
95	94	fveq2d 6887	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 − (i · 𝐴)))) = (log‘(1 + (i · (∗‘𝐴)))))
96	74, 95	eqtr3d 2798	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(log‘(1 − (i · 𝐴)))) = (log‘(1 + (i · (∗‘𝐴)))))
97		imadd 15294	. . . . . . . . . . . . . 14 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(1 + (i · 𝐴))) = ((ℑ‘1) + (ℑ‘(i · 𝐴))))
98	21, 23, 97	sylancr 599	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 + (i · 𝐴))) = ((ℑ‘1) + (ℑ‘(i · 𝐴))))
99	60	oveq2d 7434	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (0 + (ℜ‘𝐴)) = (0 + (ℑ‘(i · 𝐴))))
100	64	oveq1i 7428	. . . . . . . . . . . . . 14 ⊢ ((ℑ‘1) + (ℑ‘(i · 𝐴))) = (0 + (ℑ‘(i · 𝐴)))
101	99, 100	eqtr4di 2814	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (0 + (ℜ‘𝐴)) = ((ℑ‘1) + (ℑ‘(i · 𝐴))))
102	70	addlidd 11504	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (0 + (ℜ‘𝐴)) = (ℜ‘𝐴))
103	98, 101, 102	3eqtr2d 2802	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 + (i · 𝐴))) = (ℜ‘𝐴))
104	103, 2	eqnetrd 3023	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 + (i · 𝐴))) ≠ 0)
105		logcj 26927	. . . . . . . . . . 11 ⊢ (((1 + (i · 𝐴)) ∈ ℂ ∧ (ℑ‘(1 + (i · 𝐴))) ≠ 0) → (log‘(∗‘(1 + (i · 𝐴)))) = (∗‘(log‘(1 + (i · 𝐴)))))
106	31, 104, 105	syl2anc 596	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 + (i · 𝐴)))) = (∗‘(log‘(1 + (i · 𝐴)))))
107		cjadd 15301	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (∗‘(1 + (i · 𝐴))) = ((∗‘1) + (∗‘(i · 𝐴))))
108	21, 23, 107	sylancr 599	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 + (i · 𝐴))) = ((∗‘1) + (∗‘(i · 𝐴))))
109	79, 88	oveq12d 7436	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘1) + (∗‘(i · 𝐴))) = (1 + -(i · (∗‘𝐴))))
110		negsub 11599	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 + -(i · (∗‘𝐴))) = (1 − (i · (∗‘𝐴))))
111	21, 91, 110	sylancr 599	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + -(i · (∗‘𝐴))) = (1 − (i · (∗‘𝐴))))
112	108, 109, 111	3eqtrd 2800	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 + (i · 𝐴))) = (1 − (i · (∗‘𝐴))))
113	112	fveq2d 6887	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 + (i · 𝐴)))) = (log‘(1 − (i · (∗‘𝐴)))))
114	106, 113	eqtr3d 2798	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(log‘(1 + (i · 𝐴)))) = (log‘(1 − (i · (∗‘𝐴)))))
115	96, 114	oveq12d 7436	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘(log‘(1 − (i · 𝐴)))) − (∗‘(log‘(1 + (i · 𝐴))))) = ((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))))
116	56, 115	eqtrd 2796	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))))
117	116	negeqd 11544	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = -((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))))
118		addcl 11275	. . . . . . . . 9 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 + (i · (∗‘𝐴))) ∈ ℂ)
119	21, 91, 118	sylancr 599	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · (∗‘𝐴))) ∈ ℂ)
120		atandmcj 27230	. . . . . . . . . 10 ⊢ (𝐴 ∈ dom arctan → (∗‘𝐴) ∈ dom arctan)
121	18, 120	syl 18	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘𝐴) ∈ dom arctan)
122		atandm2 27198	. . . . . . . . . 10 ⊢ ((∗‘𝐴) ∈ dom arctan ↔ ((∗‘𝐴) ∈ ℂ ∧ (1 − (i · (∗‘𝐴))) ≠ 0 ∧ (1 + (i · (∗‘𝐴))) ≠ 0))
123	122	simp3bi 1165	. . . . . . . . 9 ⊢ ((∗‘𝐴) ∈ dom arctan → (1 + (i · (∗‘𝐴))) ≠ 0)
124	121, 123	syl 18	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · (∗‘𝐴))) ≠ 0)
125	119, 124	logcld 26891	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 + (i · (∗‘𝐴)))) ∈ ℂ)
126		subcl 11549	. . . . . . . . 9 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 − (i · (∗‘𝐴))) ∈ ℂ)
127	21, 91, 126	sylancr 599	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · (∗‘𝐴))) ∈ ℂ)
128	122	simp2bi 1164	. . . . . . . . 9 ⊢ ((∗‘𝐴) ∈ dom arctan → (1 − (i · (∗‘𝐴))) ≠ 0)
129	121, 128	syl 18	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · (∗‘𝐴))) ≠ 0)
130	127, 129	logcld 26891	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 − (i · (∗‘𝐴)))) ∈ ℂ)
131	125, 130	negsubdi2d 11678	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))) = ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴))))))
132	117, 131	eqtrd 2796	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴))))))
133	132	oveq2d 7434	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
134	36, 54, 133	3eqtrd 2800	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
135		atanval 27205	. . . . 5 ⊢ (𝐴 ∈ dom arctan → (arctan‘𝐴) = ((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))))
136	18, 135	syl 18	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (arctan‘𝐴) = ((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))))
137	136	fveq2d 6887	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(arctan‘𝐴)) = (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
138		atanval 27205	. . . 4 ⊢ ((∗‘𝐴) ∈ dom arctan → (arctan‘(∗‘𝐴)) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
139	121, 138	syl 18	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (arctan‘(∗‘𝐴)) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
140	134, 137, 139	3eqtr4d 2806	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(arctan‘𝐴)) = (arctan‘(∗‘𝐴)))
141	18, 140	jca 521	1 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (𝐴 ∈ dom arctan ∧ (∗‘(arctan‘𝐴)) = (arctan‘(∗‘𝐴))))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ≠ wne 2956 dom cdm 5651 ‘cfv 6537 (class class class)co 7418 ℂcc 11191 ℝcr 11192 0cc0 11193 1c1 11194 ici 11195 + caddc 11196 · cmul 11198 − cmin 11534 -cneg 11535 / cdiv 11966 2c2 12390 ∗ccj 15256 ℜcre 15257 ℑcim 15258 logclog 26875 arctancatan 27185

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7749 ax-inf2 9635 ax-cnex 11249 ax-resscn 11250 ax-1cn 11251 ax-icn 11252 ax-addcl 11253 ax-addrcl 11254 ax-mulcl 11255 ax-mulrcl 11256 ax-mulcom 11257 ax-addass 11258 ax-mulass 11259 ax-distr 11260 ax-i2m1 11261 ax-1ne0 11262 ax-1rid 11263 ax-rnegex 11264 ax-rrecex 11265 ax-cnre 11266 ax-pre-lttri 11267 ax-pre-lttrn 11268 ax-pre-ltadd 11269 ax-pre-mulgt0 11270 ax-pre-sup 11271 ax-addf 11272

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-iin 4954 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-isom 6546 df-riota 7375 df-ov 7421 df-oprab 7422 df-mpo 7423 df-of 7691 df-om 7876 df-1st 7999 df-2nd 8000 df-supp 8171 df-frecs 8292 df-wrecs 8323 df-recs 8372 df-rdg 8411 df-1o 8469 df-2o 8470 df-er 8710 df-map 8842 df-pm 8843 df-ixp 8919 df-en 8967 df-dom 8968 df-sdom 8969 df-fin 8970 df-fsupp 9347 df-fi 9396 df-sup 9427 df-inf 9428 df-oi 9497 df-card 10013 df-pnf 11338 df-mnf 11339 df-xr 11340 df-ltxr 11341 df-le 11342 df-sub 11536 df-neg 11537 df-div 11967 df-nn 12329 df-2 12398 df-3 12399 df-4 12400 df-5 12401 df-6 12402 df-7 12403 df-8 12404 df-9 12405 df-n0 12600 df-z 12687 df-dec 12808 df-uz 12959 df-q 13069 df-rp 13114 df-xneg 13234 df-xadd 13235 df-xmul 13236 df-ioo 13473 df-ioc 13474 df-ico 13475 df-icc 13476 df-fz 13633 df-fzo 13782 df-fl 13925 df-mod 14003 df-seq 14138 df-exp 14198 df-fac 14411 df-bc 14440 df-hash 14468 df-shft 15213 df-cj 15259 df-re 15260 df-im 15261 df-sqrt 15395 df-abs 15396 df-limsup 15631 df-clim 15648 df-rlim 15649 df-sum 15847 df-ef 16226 df-sin 16228 df-cos 16229 df-pi 16231 df-struct 17318 df-sets 17335 df-slot 17353 df-ndx 17365 df-base 17381 df-ress 17402 df-plusg 17434 df-mulr 17435 df-starv 17436 df-sca 17437 df-vsca 17438 df-ip 17439 df-tset 17440 df-ple 17441 df-ds 17443 df-unif 17444 df-hom 17445 df-cco 17446 df-rest 17586 df-topn 17587 df-0g 17605 df-gsum 17606 df-topgen 17607 df-pt 17608 df-prds 17611 df-xrs 17667 df-qtop 17672 df-imas 17673 df-xps 17675 df-mre 17749 df-mrc 17750 df-acs 17752 df-mgm 18809 df-sgrp 18901 df-mnd 18917 df-submnd 18972 df-mulg 19271 df-cntz 19524 df-cmn 19989 df-psmet 21663 df-xmet 21664 df-met 21665 df-bl 21666 df-mopn 21667 df-fbas 21668 df-fg 21669 df-cnfld 21672 df-top 23205 df-topon 23222 df-topsp 23244 df-bases 23257 df-cld 23330 df-ntr 23331 df-cls 23332 df-nei 23409 df-lp 23447 df-perf 23448 df-cn 23538 df-cnp 23539 df-haus 23626 df-tx 23874 df-hmeo 24067 df-fil 24158 df-fm 24250 df-flim 24251 df-flf 24252 df-xms 24632 df-ms 24633 df-tms 24634 df-cncf 25192 df-limc 26179 df-dv 26180 df-log 26877 df-atan 27188

This theorem is used by: atanrecl 27232

W3C validator