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Theorem logneg2 25305

Description: The logarithm of the negative of a number with positive imaginary part is i · π less than the original. (Compare logneg 25278.) (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 14518	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (ℑ‘𝐴) ∈ ℝ)
2		gt0ne0 11143	. . . . . . . 8 ⊢ (((ℑ‘𝐴) ∈ ℝ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘𝐴) ≠ 0)
3	1, 2	sylan 583	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘𝐴) ≠ 0)
4		fveq2 6658	. . . . . . . . 9 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = (ℑ‘0))
5		im0 14560	. . . . . . . . 9 ⊢ (ℑ‘0) = 0
6	4, 5	eqtrdi 2809	. . . . . . . 8 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = 0)
7	6	necon3i 2983	. . . . . . 7 ⊢ ((ℑ‘𝐴) ≠ 0 → 𝐴 ≠ 0)
8	3, 7	syl 17	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → 𝐴 ≠ 0)
9		logcl 25259	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (log‘𝐴) ∈ ℂ)
10	8, 9	syldan 594	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘𝐴) ∈ ℂ)
11		ax-icn 10634	. . . . . 6 ⊢ i ∈ ℂ
12		picn 25151	. . . . . 6 ⊢ π ∈ ℂ
13	11, 12	mulcli 10686	. . . . 5 ⊢ (i · π) ∈ ℂ
14		efsub 15501	. . . . 5 ⊢ (((log‘𝐴) ∈ ℂ ∧ (i · π) ∈ ℂ) → (exp‘((log‘𝐴) − (i · π))) = ((exp‘(log‘𝐴)) / (exp‘(i · π))))
15	10, 13, 14	sylancl 589	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘((log‘𝐴) − (i · π))) = ((exp‘(log‘𝐴)) / (exp‘(i · π))))
16		eflog 25267	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (exp‘(log‘𝐴)) = 𝐴)
17	8, 16	syldan 594	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘(log‘𝐴)) = 𝐴)
18		efipi 25165	. . . . . 6 ⊢ (exp‘(i · π)) = -1
19	18	a1i 11	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘(i · π)) = -1)
20	17, 19	oveq12d 7168	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((exp‘(log‘𝐴)) / (exp‘(i · π))) = (𝐴 / -1))
21		ax-1cn 10633	. . . . . . 7 ⊢ 1 ∈ ℂ
22		ax-1ne0 10644	. . . . . . 7 ⊢ 1 ≠ 0
23		divneg2 11402	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ≠ 0) → -(𝐴 / 1) = (𝐴 / -1))
24	21, 22, 23	mp3an23 1450	. . . . . 6 ⊢ (𝐴 ∈ ℂ → -(𝐴 / 1) = (𝐴 / -1))
25		div1 11367	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴 / 1) = 𝐴)
26	25	negeqd 10918	. . . . . 6 ⊢ (𝐴 ∈ ℂ → -(𝐴 / 1) = -𝐴)
27	24, 26	eqtr3d 2795	. . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐴 / -1) = -𝐴)
28	27	adantr 484	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (𝐴 / -1) = -𝐴)
29	15, 20, 28	3eqtrd 2797	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘((log‘𝐴) − (i · π))) = -𝐴)
30	29	fveq2d 6662	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘(exp‘((log‘𝐴) − (i · π)))) = (log‘-𝐴))
31		subcl 10923	. . . . 5 ⊢ (((log‘𝐴) ∈ ℂ ∧ (i · π) ∈ ℂ) → ((log‘𝐴) − (i · π)) ∈ ℂ)
32	10, 13, 31	sylancl 589	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((log‘𝐴) − (i · π)) ∈ ℂ)
33		argimgt0 25302	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ (0(,)π))
34		eliooord 12838	. . . . . . . . 9 ⊢ ((ℑ‘(log‘𝐴)) ∈ (0(,)π) → (0 < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) < π))
35	33, 34	syl 17	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (0 < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) < π))
36	35	simpld 498	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → 0 < (ℑ‘(log‘𝐴)))
37		imcl 14518	. . . . . . . . 9 ⊢ ((log‘𝐴) ∈ ℂ → (ℑ‘(log‘𝐴)) ∈ ℝ)
38	10, 37	syl 17	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ ℝ)
39		pire 25150	. . . . . . . . 9 ⊢ π ∈ ℝ
40	39	renegcli 10985	. . . . . . . 8 ⊢ -π ∈ ℝ
41		ltaddpos2 11169	. . . . . . . 8 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℝ ∧ -π ∈ ℝ) → (0 < (ℑ‘(log‘𝐴)) ↔ -π < ((ℑ‘(log‘𝐴)) + -π)))
42	38, 40, 41	sylancl 589	. . . . . . 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 10707	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ ℂ)
45		negsub 10972	. . . . . . 7 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℂ ∧ π ∈ ℂ) → ((ℑ‘(log‘𝐴)) + -π) = ((ℑ‘(log‘𝐴)) − π))
46	44, 12, 45	sylancl 589	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) + -π) = ((ℑ‘(log‘𝐴)) − π))
47	43, 46	breqtrd 5058	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < ((ℑ‘(log‘𝐴)) − π))
48		imsub 14542	. . . . . . 7 ⊢ (((log‘𝐴) ∈ ℂ ∧ (i · π) ∈ ℂ) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))))
49	10, 13, 48	sylancl 589	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))))
50		reim 14516	. . . . . . . . 9 ⊢ (π ∈ ℂ → (ℜ‘π) = (ℑ‘(i · π)))
51	12, 50	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = (ℑ‘(i · π))
52		rere 14529	. . . . . . . . 9 ⊢ (π ∈ ℝ → (ℜ‘π) = π)
53	39, 52	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = π
54	51, 53	eqtr3i 2783	. . . . . . 7 ⊢ (ℑ‘(i · π)) = π
55	54	oveq2i 7161	. . . . . 6 ⊢ ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))) = ((ℑ‘(log‘𝐴)) − π)
56	49, 55	eqtrdi 2809	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − π))
57	47, 56	breqtrrd 5060	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < (ℑ‘((log‘𝐴) − (i · π))))
58		resubcl 10988	. . . . . . 7 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℝ ∧ π ∈ ℝ) → ((ℑ‘(log‘𝐴)) − π) ∈ ℝ)
59	38, 39, 58	sylancl 589	. . . . . 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 10681	. . . . . . . 8 ⊢ 0 ∈ ℝ
62		pipos 25152	. . . . . . . 8 ⊢ 0 < π
63	61, 39, 62	ltleii 10801	. . . . . . 7 ⊢ 0 ≤ π
64		subge02 11194	. . . . . . . 8 ⊢ (((ℑ‘(log‘𝐴)) ∈ ℝ ∧ π ∈ ℝ) → (0 ≤ π ↔ ((ℑ‘(log‘𝐴)) − π) ≤ (ℑ‘(log‘𝐴))))
65	38, 39, 64	sylancl 589	. . . . . . 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 25260	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (-π < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) ≤ π))
68	8, 67	syldan 594	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (-π < (ℑ‘(log‘𝐴)) ∧ (ℑ‘(log‘𝐴)) ≤ π))
69	68	simprd 499	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ≤ π)
70	59, 38, 60, 66, 69	letrd 10835	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) − π) ≤ π)
71	56, 70	eqbrtrd 5054	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) ≤ π)
72		ellogrn 25250	. . . 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 1340	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((log‘𝐴) − (i · π)) ∈ ran log)
74		logef 25272	. . 3 ⊢ (((log‘𝐴) − (i · π)) ∈ ran log → (log‘(exp‘((log‘𝐴) − (i · π)))) = ((log‘𝐴) − (i · π)))
75	73, 74	syl 17	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘(exp‘((log‘𝐴) − (i · π)))) = ((log‘𝐴) − (i · π)))
76	30, 75	eqtr3d 2795	1 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘-𝐴) = ((log‘𝐴) − (i · π)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1538 ∈ wcel 2111 ≠ wne 2951 class class class wbr 5032 ran crn 5525 ‘cfv 6335 (class class class)co 7150 ℂcc 10573 ℝcr 10574 0cc0 10575 1c1 10576 ici 10577 + caddc 10578 · cmul 10580 < clt 10713 ≤ cle 10714 − cmin 10908 -cneg 10909 / cdiv 11335 (,)cioo 12779 ℜcre 14504 ℑcim 14505 expce 15463 πcpi 15468 logclog 25245

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-rep 5156 ax-sep 5169 ax-nul 5176 ax-pow 5234 ax-pr 5298 ax-un 7459 ax-inf2 9137 ax-cnex 10631 ax-resscn 10632 ax-1cn 10633 ax-icn 10634 ax-addcl 10635 ax-addrcl 10636 ax-mulcl 10637 ax-mulrcl 10638 ax-mulcom 10639 ax-addass 10640 ax-mulass 10641 ax-distr 10642 ax-i2m1 10643 ax-1ne0 10644 ax-1rid 10645 ax-rnegex 10646 ax-rrecex 10647 ax-cnre 10648 ax-pre-lttri 10649 ax-pre-lttrn 10650 ax-pre-ltadd 10651 ax-pre-mulgt0 10652 ax-pre-sup 10653 ax-addf 10654 ax-mulf 10655

This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-nel 3056 df-ral 3075 df-rex 3076 df-reu 3077 df-rmo 3078 df-rab 3079 df-v 3411 df-sbc 3697 df-csb 3806 df-dif 3861 df-un 3863 df-in 3865 df-ss 3875 df-pss 3877 df-nul 4226 df-if 4421 df-pw 4496 df-sn 4523 df-pr 4525 df-tp 4527 df-op 4529 df-uni 4799 df-int 4839 df-iun 4885 df-iin 4886 df-br 5033 df-opab 5095 df-mpt 5113 df-tr 5139 df-id 5430 df-eprel 5435 df-po 5443 df-so 5444 df-fr 5483 df-se 5484 df-we 5485 df-xp 5530 df-rel 5531 df-cnv 5532 df-co 5533 df-dm 5534 df-rn 5535 df-res 5536 df-ima 5537 df-pred 6126 df-ord 6172 df-on 6173 df-lim 6174 df-suc 6175 df-iota 6294 df-fun 6337 df-fn 6338 df-f 6339 df-f1 6340 df-fo 6341 df-f1o 6342 df-fv 6343 df-isom 6344 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-of 7405 df-om 7580 df-1st 7693 df-2nd 7694 df-supp 7836 df-wrecs 7957 df-recs 8018 df-rdg 8056 df-1o 8112 df-2o 8113 df-er 8299 df-map 8418 df-pm 8419 df-ixp 8480 df-en 8528 df-dom 8529 df-sdom 8530 df-fin 8531 df-fsupp 8867 df-fi 8908 df-sup 8939 df-inf 8940 df-oi 9007 df-card 9401 df-pnf 10715 df-mnf 10716 df-xr 10717 df-ltxr 10718 df-le 10719 df-sub 10910 df-neg 10911 df-div 11336 df-nn 11675 df-2 11737 df-3 11738 df-4 11739 df-5 11740 df-6 11741 df-7 11742 df-8 11743 df-9 11744 df-n0 11935 df-z 12021 df-dec 12138 df-uz 12283 df-q 12389 df-rp 12431 df-xneg 12548 df-xadd 12549 df-xmul 12550 df-ioo 12783 df-ioc 12784 df-ico 12785 df-icc 12786 df-fz 12940 df-fzo 13083 df-fl 13211 df-mod 13287 df-seq 13419 df-exp 13480 df-fac 13684 df-bc 13713 df-hash 13741 df-shft 14474 df-cj 14506 df-re 14507 df-im 14508 df-sqrt 14642 df-abs 14643 df-limsup 14876 df-clim 14893 df-rlim 14894 df-sum 15091 df-ef 15469 df-sin 15471 df-cos 15472 df-pi 15474 df-struct 16543 df-ndx 16544 df-slot 16545 df-base 16547 df-sets 16548 df-ress 16549 df-plusg 16636 df-mulr 16637 df-starv 16638 df-sca 16639 df-vsca 16640 df-ip 16641 df-tset 16642 df-ple 16643 df-ds 16645 df-unif 16646 df-hom 16647 df-cco 16648 df-rest 16754 df-topn 16755 df-0g 16773 df-gsum 16774 df-topgen 16775 df-pt 16776 df-prds 16779 df-xrs 16833 df-qtop 16838 df-imas 16839 df-xps 16841 df-mre 16915 df-mrc 16916 df-acs 16918 df-mgm 17918 df-sgrp 17967 df-mnd 17978 df-submnd 18023 df-mulg 18292 df-cntz 18514 df-cmn 18975 df-psmet 20158 df-xmet 20159 df-met 20160 df-bl 20161 df-mopn 20162 df-fbas 20163 df-fg 20164 df-cnfld 20167 df-top 21594 df-topon 21611 df-topsp 21633 df-bases 21646 df-cld 21719 df-ntr 21720 df-cls 21721 df-nei 21798 df-lp 21836 df-perf 21837 df-cn 21927 df-cnp 21928 df-haus 22015 df-tx 22262 df-hmeo 22455 df-fil 22546 df-fm 22638 df-flim 22639 df-flf 22640 df-xms 23022 df-ms 23023 df-tms 23024 df-cncf 23579 df-limc 24565 df-dv 24566 df-log 25247

This theorem is referenced by: atanlogsublem 25600

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