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Theorem logneg2 26944

Description: The logarithm of the negative of a number with positive imaginary part is i · π less than the original. (Compare logneg 26917.) (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 15279	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (ℑ‘𝐴) ∈ ℝ)
2		gt0ne0 11782	. . . . . . . 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 6885	. . . . . . . . 9 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = (ℑ‘0))
5		im0 15321	. . . . . . . . 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 26897	. . . . . 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 11260	. . . . . 6 ⊢ i ∈ ℂ
12		picn 26786	. . . . . 6 ⊢ π ∈ ℂ
13	11, 12	mulcli 11317	. . . . 5 ⊢ (i · π) ∈ ℂ
14		efsub 16269	. . . . 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 26905	. . . . . 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 26803	. . . . . 6 ⊢ (exp‘(i · π)) = -1
19	18	a1i 11	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘(i · π)) = -1)
20	17, 19	oveq12d 7438	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((exp‘(log‘𝐴)) / (exp‘(i · π))) = (𝐴 / -1))
21		ax-1cn 11259	. . . . . . 7 ⊢ 1 ∈ ℂ
22		ax-1ne0 11270	. . . . . . 7 ⊢ 1 ≠ 0
23		divneg2 12042	. . . . . . 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 12007	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴 / 1) = 𝐴)
26	25	negeqd 11552	. . . . . 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 6889	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘(exp‘((log‘𝐴) − (i · π)))) = (log‘ -𝐴))
31		subcl 11557	. . . . 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 26941	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ (0(,)π))
34		eliooord 13537	. . . . . . . . 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 15279	. . . . . . . . 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 26784	. . . . . . . . 9 ⊢ π ∈ ℝ
40	39	renegcli 11620	. . . . . . . 8 ⊢ -π ∈ ℝ
41		ltaddpos2 11808	. . . . . . . 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 11338	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ ℂ)
45		negsub 11607	. . . . . . 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 15303	. . . . . . 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 15277	. . . . . . . . 9 ⊢ (π ∈ ℂ → (ℜ‘π) = (ℑ‘(i · π)))
51	12, 50	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = (ℑ‘(i · π))
52		rere 15290	. . . . . . . . 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 7431	. . . . . 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 11623	. . . . . . 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 11311	. . . . . . . 8 ⊢ 0 ∈ ℝ
62		pipos 26788	. . . . . . . 8 ⊢ 0 < π
63	61, 39, 62	ltleii 11434	. . . . . . 7 ⊢ 0 ≤ π
64		subge02 11833	. . . . . . . 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 26898	. . . . . . . 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 11468	. . . . 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 26888	. . . 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 26910	. . 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 1569 ∈ wcel 2144 ≠ wne 2955 class class class wbr 5102 ran crn 5651 ‘cfv 6538 (class class class)co 7420 ℂcc 11199 ℝcr 11200 0cc0 11201 1c1 11202 ici 11203 + caddc 11204 · cmul 11206 < clt 11344 ≤ cle 11345 − cmin 11542 -cneg 11543 / cdiv 11974 (,)cioo 13477 ℜcre 15265 ℑcim 15266 expce 16228 πcpi 16233 logclog 26883

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-inf2 9643 ax-cnex 11257 ax-resscn 11258 ax-1cn 11259 ax-icn 11260 ax-addcl 11261 ax-addrcl 11262 ax-mulcl 11263 ax-mulrcl 11264 ax-mulcom 11265 ax-addass 11266 ax-mulass 11267 ax-distr 11268 ax-i2m1 11269 ax-1ne0 11270 ax-1rid 11271 ax-rnegex 11272 ax-rrecex 11273 ax-cnre 11274 ax-pre-lttri 11275 ax-pre-lttrn 11276 ax-pre-ltadd 11277 ax-pre-mulgt0 11278 ax-pre-sup 11279 ax-addf 11280

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 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-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 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 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-se 5604 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-isom 6547 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-of 7693 df-om 7878 df-1st 8001 df-2nd 8002 df-supp 8178 df-frecs 8300 df-wrecs 8331 df-recs 8380 df-rdg 8419 df-1o 8477 df-2o 8478 df-er 8718 df-map 8850 df-pm 8851 df-ixp 8927 df-en 8975 df-dom 8976 df-sdom 8977 df-fin 8978 df-fsupp 9355 df-fi 9404 df-sup 9435 df-inf 9436 df-oi 9505 df-card 10021 df-pnf 11346 df-mnf 11347 df-xr 11348 df-ltxr 11349 df-le 11350 df-sub 11544 df-neg 11545 df-div 11975 df-nn 12337 df-2 12406 df-3 12407 df-4 12408 df-5 12409 df-6 12410 df-7 12411 df-8 12412 df-9 12413 df-n0 12608 df-z 12695 df-dec 12816 df-uz 12967 df-q 13077 df-rp 13122 df-xneg 13242 df-xadd 13243 df-xmul 13244 df-ioo 13481 df-ioc 13482 df-ico 13483 df-icc 13484 df-fz 13641 df-fzo 13790 df-fl 13933 df-mod 14011 df-seq 14146 df-exp 14206 df-fac 14419 df-bc 14448 df-hash 14476 df-shft 15221 df-cj 15267 df-re 15268 df-im 15269 df-sqrt 15403 df-abs 15404 df-limsup 15639 df-clim 15656 df-rlim 15657 df-sum 15855 df-ef 16234 df-sin 16236 df-cos 16237 df-pi 16239 df-struct 17326 df-sets 17343 df-slot 17361 df-ndx 17373 df-base 17389 df-ress 17410 df-plusg 17442 df-mulr 17443 df-starv 17444 df-sca 17445 df-vsca 17446 df-ip 17447 df-tset 17448 df-ple 17449 df-ds 17451 df-unif 17452 df-hom 17453 df-cco 17454 df-rest 17594 df-topn 17595 df-0g 17613 df-gsum 17614 df-topgen 17615 df-pt 17616 df-prds 17619 df-xrs 17675 df-qtop 17680 df-imas 17681 df-xps 17683 df-mre 17757 df-mrc 17758 df-acs 17760 df-mgm 18817 df-sgrp 18909 df-mnd 18925 df-submnd 18980 df-mulg 19279 df-cntz 19532 df-cmn 19997 df-psmet 21671 df-xmet 21672 df-met 21673 df-bl 21674 df-mopn 21675 df-fbas 21676 df-fg 21677 df-cnfld 21680 df-top 23213 df-topon 23230 df-topsp 23252 df-bases 23265 df-cld 23338 df-ntr 23339 df-cls 23340 df-nei 23417 df-lp 23455 df-perf 23456 df-cn 23546 df-cnp 23547 df-haus 23634 df-tx 23882 df-hmeo 24075 df-fil 24166 df-fm 24258 df-flim 24259 df-flf 24260 df-xms 24640 df-ms 24641 df-tms 24642 df-cncf 25200 df-limc 26187 df-dv 26188 df-log 26885

This theorem is used by: atanlogsublem 27244

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