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Theorem logneg2 26907

Description: The logarithm of the negative of a number with positive imaginary part is i · π less than the original. (Compare logneg 26880.) (Contributed by Mario Carneiro, 3-Apr-2015.)

**Assertion**
Ref	Expression
logneg2	⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘-𝐴) = ((log‘𝐴) − (i · π)))

**Proof of Theorem logneg2**
Step	Hyp	Ref	Expression
1		imcl 15246	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (ℑ‘𝐴) ∈ ℝ)
2		gt0ne0 11751	. . . . . . . 8 ⊢ (((ℑ‘𝐴) ∈ ℝ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘𝐴) ≠ 0)
3	1, 2	sylan 592	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘𝐴) ≠ 0)
4		fveq2 6873	. . . . . . . . 9 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = (ℑ‘0))
5		im0 15288	. . . . . . . . 9 ⊢ (ℑ‘0) = 0
6	4, 5	eqtrdi 2811	. . . . . . . 8 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = 0)
7	6	necon3i 2987	. . . . . . 7 ⊢ ((ℑ‘𝐴) ≠ 0 → 𝐴 ≠ 0)
8	3, 7	syl 18	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → 𝐴 ≠ 0)
9		logcl 26860	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (log‘𝐴) ∈ ℂ)
10	8, 9	syldan 603	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘𝐴) ∈ ℂ)
11		ax-icn 11231	. . . . . 6 ⊢ i ∈ ℂ
12		picn 26749	. . . . . 6 ⊢ π ∈ ℂ
13	11, 12	mulcli 11288	. . . . 5 ⊢ (i · π) ∈ ℂ
14		efsub 16236	. . . . 5 ⊢ (((log‘𝐴) ∈ ℂ ∧ (i · π) ∈ ℂ) → (exp‘((log‘𝐴) − (i · π))) = ((exp‘(log‘𝐴)) / (exp‘(i · π))))
15	10, 13, 14	sylancl 598	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘((log‘𝐴) − (i · π))) = ((exp‘(log‘𝐴)) / (exp‘(i · π))))
16		eflog 26868	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (exp‘(log‘𝐴)) = 𝐴)
17	8, 16	syldan 603	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘(log‘𝐴)) = 𝐴)
18		efipi 26766	. . . . . 6 ⊢ (exp‘(i · π)) = -1
19	18	a1i 11	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘(i · π)) = -1)
20	17, 19	oveq12d 7426	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((exp‘(log‘𝐴)) / (exp‘(i · π))) = (𝐴 / -1))
21		ax-1cn 11230	. . . . . . 7 ⊢ 1 ∈ ℂ
22		ax-1ne0 11241	. . . . . . 7 ⊢ 1 ≠ 0
23		divneg2 12011	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0) → -(𝐴 / 1) = (𝐴 / -1))
24	21, 22, 23	mp3an23 1482	. . . . . 6 ⊢ (𝐴 ∈ ℂ → -(𝐴 / 1) = (𝐴 / -1))
25		div1 11976	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴 / 1) = 𝐴)
26	25	negeqd 11523	. . . . . 6 ⊢ (𝐴 ∈ ℂ → -(𝐴 / 1) = -𝐴)
27	24, 26	eqtr3d 2797	. . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐴 / -1) = -𝐴)
28	27	adantr 486	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (𝐴 / -1) = -𝐴)
29	15, 20, 28	3eqtrd 2799	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘((log‘𝐴) − (i · π))) = -𝐴)
30	29	fveq2d 6877	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘(exp‘((log‘𝐴) − (i · π)))) = (log‘-𝐴))
31		subcl 11528	. . . . 5 ⊢ (((log‘𝐴) ∈ ℂ ∧ (i · π) ∈ ℂ) → ((log‘𝐴) − (i · π)) ∈ ℂ)
32	10, 13, 31	sylancl 598	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((log‘𝐴) − (i · π)) ∈ ℂ)
33		argimgt0 26904	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ (0(,)π))
34		eliooord 13506	. . . . . . . . 9 ⊢ ((ℑ‘(log‘𝐴)) ∈ (0(,)π) → (0 < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) < π))
35	33, 34	syl 18	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (0 < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) < π))
36	35	simpld 500	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → 0 < (ℑ‘(log‘𝐴)))
37		imcl 15246	. . . . . . . . 9 ⊢ ((log‘𝐴) ∈ ℂ → (ℑ‘(log‘𝐴)) ∈ ℝ)
38	10, 37	syl 18	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ ℝ)
39		pire 26747	. . . . . . . . 9 ⊢ π ∈ ℝ
40	39	renegcli 11591	. . . . . . . 8 ⊢ -π ∈ ℝ
41		ltaddpos2 11777	. . . . . . . 8 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℝ ∧ -π ∈ ℝ) → (0 < (ℑ‘(log‘𝐴)) ↔ -π < ((ℑ‘(log‘𝐴)) + -π)))
42	38, 40, 41	sylancl 598	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (0 < (ℑ‘(log‘𝐴)) ↔ -π < ((ℑ‘(log‘𝐴)) + -π)))
43	36, 42	mpbid 235	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < ((ℑ‘(log‘𝐴)) + -π))
44	38	recnd 11309	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ ℂ)
45		negsub 11578	. . . . . . 7 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℂ ∧ π ∈ ℂ) → ((ℑ‘(log‘𝐴)) + -π) = ((ℑ‘(log‘𝐴)) − π))
46	44, 12, 45	sylancl 598	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) + -π) = ((ℑ‘(log‘𝐴)) − π))
47	43, 46	breqtrd 5130	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < ((ℑ‘(log‘𝐴)) − π))
48		imsub 15270	. . . . . . 7 ⊢ (((log‘𝐴) ∈ ℂ ∧ (i · π) ∈ ℂ) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))))
49	10, 13, 48	sylancl 598	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))))
50		reim 15244	. . . . . . . . 9 ⊢ (π ∈ ℂ → (ℜ‘π) = (ℑ‘(i · π)))
51	12, 50	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = (ℑ‘(i · π))
52		rere 15257	. . . . . . . . 9 ⊢ (π ∈ ℝ → (ℜ‘π) = π)
53	39, 52	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = π
54	51, 53	eqtr3i 2785	. . . . . . 7 ⊢ (ℑ‘(i · π)) = π
55	54	oveq2i 7419	. . . . . 6 ⊢ ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))) = ((ℑ‘(log‘𝐴)) − π)
56	49, 55	eqtrdi 2811	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − π))
57	47, 56	breqtrrd 5132	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < (ℑ‘((log‘𝐴) − (i · π))))
58		resubcl 11594	. . . . . . 7 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℝ ∧ π ∈ ℝ) → ((ℑ‘(log‘𝐴)) − π) ∈ ℝ)
59	38, 39, 58	sylancl 598	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) − π) ∈ ℝ)
60	39	a1i 11	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → π ∈ ℝ)
61		0re 11282	. . . . . . . 8 ⊢ 0 ∈ ℝ
62		pipos 26751	. . . . . . . 8 ⊢ 0 < π
63	61, 39, 62	ltleii 11405	. . . . . . 7 ⊢ 0 ≤ π
64		subge02 11802	. . . . . . . 8 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℝ ∧ π ∈ ℝ) → (0 ≤ π ↔ ((ℑ‘(log‘𝐴)) − π) ≤ (ℑ‘(log‘𝐴))))
65	38, 39, 64	sylancl 598	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (0 ≤ π ↔ ((ℑ‘(log‘𝐴)) − π) ≤ (ℑ‘(log‘𝐴))))
66	63, 65	mpbii 236	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) − π) ≤ (ℑ‘(log‘𝐴)))
67		logimcl 26861	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (-π < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) ≤ π))
68	8, 67	syldan 603	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (-π < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) ≤ π))
69	68	simprd 501	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ≤ π)
70	59, 38, 60, 66, 69	letrd 11439	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) − π) ≤ π)
71	56, 70	eqbrtrd 5126	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) ≤ π)
72		ellogrn 26851	. . . 4 ⊢ (((log‘𝐴) − (i · π)) ∈ ran log ↔ (((log‘𝐴) − (i · π)) ∈ ℂ ∧ -π < (ℑ‘((log‘𝐴) − (i · π))) ∧ (ℑ‘((log‘𝐴) − (i · π))) ≤ π))
73	32, 57, 71, 72	syl3anbrc 1362	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((log‘𝐴) − (i · π)) ∈ ran log)
74		logef 26873	. . 3 ⊢ (((log‘𝐴) − (i · π)) ∈ ran log → (log‘(exp‘((log‘𝐴) − (i · π)))) = ((log‘𝐴) − (i · π)))
75	73, 74	syl 18	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘(exp‘((log‘𝐴) − (i · π)))) = ((log‘𝐴) − (i · π)))
76	30, 75	eqtr3d 2797	1 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘-𝐴) = ((log‘𝐴) − (i · π)))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2955 class class class wbr 5102 ran crn 5648 ‘cfv 6527 (class class class)co 7408 ℂcc 11170 ℝcr 11171 0cc0 11172 1c1 11173 ici 11174 + caddc 11175 · cmul 11177 < clt 11315 ≤ cle 11316 − cmin 11513 -cneg 11514 / cdiv 11943 (,)cioo 13446 ℜcre 15232 ℑcim 15233 expce 16195 πcpi 16200 logclog 26846

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 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 ax-inf2 9620 ax-cnex 11228 ax-resscn 11229 ax-1cn 11230 ax-icn 11231 ax-addcl 11232 ax-addrcl 11233 ax-mulcl 11234 ax-mulrcl 11235 ax-mulcom 11236 ax-addass 11237 ax-mulass 11238 ax-distr 11239 ax-i2m1 11240 ax-1ne0 11241 ax-1rid 11242 ax-rnegex 11243 ax-rrecex 11244 ax-cnre 11245 ax-pre-lttri 11246 ax-pre-lttrn 11247 ax-pre-ltadd 11248 ax-pre-mulgt0 11249 ax-pre-sup 11250 ax-addf 11251

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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-tp 4588 df-op 4590 df-uni 4867 df-int 4907 df-iun 4952 df-iin 4953 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-se 5601 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 df-ord 6354 df-on 6355 df-lim 6356 df-suc 6357 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-isom 6536 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-of 7676 df-om 7861 df-1st 7984 df-2nd 7985 df-supp 8156 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 df-1o 8454 df-2o 8455 df-er 8695 df-map 8827 df-pm 8828 df-ixp 8904 df-en 8952 df-dom 8953 df-sdom 8954 df-fin 8955 df-fsupp 9332 df-fi 9381 df-sup 9412 df-inf 9413 df-oi 9482 df-card 9992 df-pnf 11317 df-mnf 11318 df-xr 11319 df-ltxr 11320 df-le 11321 df-sub 11515 df-neg 11516 df-div 11944 df-nn 12306 df-2 12375 df-3 12376 df-4 12377 df-5 12378 df-6 12379 df-7 12380 df-8 12381 df-9 12382 df-n0 12577 df-z 12664 df-dec 12785 df-uz 12936 df-q 13046 df-rp 13091 df-xneg 13211 df-xadd 13212 df-xmul 13213 df-ioo 13450 df-ioc 13451 df-ico 13452 df-icc 13453 df-fz 13610 df-fzo 13758 df-fl 13901 df-mod 13979 df-seq 14114 df-exp 14174 df-fac 14386 df-bc 14415 df-hash 14443 df-shft 15188 df-cj 15234 df-re 15235 df-im 15236 df-sqrt 15370 df-abs 15371 df-limsup 15606 df-clim 15623 df-rlim 15624 df-sum 15822 df-ef 16201 df-sin 16203 df-cos 16204 df-pi 16206 df-struct 17287 df-sets 17304 df-slot 17322 df-ndx 17334 df-base 17350 df-ress 17371 df-plusg 17403 df-mulr 17404 df-starv 17405 df-sca 17406 df-vsca 17407 df-ip 17408 df-tset 17409 df-ple 17410 df-ds 17412 df-unif 17413 df-hom 17414 df-cco 17415 df-rest 17555 df-topn 17556 df-0g 17574 df-gsum 17575 df-topgen 17576 df-pt 17577 df-prds 17580 df-xrs 17636 df-qtop 17641 df-imas 17642 df-xps 17644 df-mre 17718 df-mrc 17719 df-acs 17721 df-mgm 18778 df-sgrp 18870 df-mnd 18886 df-submnd 18941 df-mulg 19240 df-cntz 19493 df-cmn 19958 df-psmet 21632 df-xmet 21633 df-met 21634 df-bl 21635 df-mopn 21636 df-fbas 21637 df-fg 21638 df-cnfld 21641 df-top 23174 df-topon 23191 df-topsp 23213 df-bases 23226 df-cld 23299 df-ntr 23300 df-cls 23301 df-nei 23378 df-lp 23416 df-perf 23417 df-cn 23507 df-cnp 23508 df-haus 23595 df-tx 23843 df-hmeo 24036 df-fil 24127 df-fm 24219 df-flim 24220 df-flf 24221 df-xms 24601 df-ms 24602 df-tms 24603 df-cncf 25161 df-limc 26148 df-dv 26149 df-log 26848

This theorem is used by: atanlogsublem 27207

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