logneg2 - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > logneg2		Structured version Visualization version GIF version

Theorem logneg2 26853

Description: The logarithm of the negative of a number with positive imaginary part is i · π less than the original. (Compare logneg 26826.) (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 15200	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (ℑ‘𝐴) ∈ ℝ)
2		gt0ne0 11706	. . . . . . . 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 6882	. . . . . . . . 9 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = (ℑ‘0))
5		im0 15242	. . . . . . . . 9 ⊢ (ℑ‘0) = 0
6	4, 5	eqtrdi 2813	. . . . . . . 8 ⊢ (𝐴 = 0 → (ℑ‘𝐴) = 0)
7	6	necon3i 2989	. . . . . . 7 ⊢ ((ℑ‘𝐴) ≠ 0 → 𝐴 ≠ 0)
8	3, 7	syl 18	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → 𝐴 ≠ 0)
9		logcl 26806	. . . . . 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 11186	. . . . . 6 ⊢ i ∈ ℂ
12		picn 26694	. . . . . 6 ⊢ π ∈ ℂ
13	11, 12	mulcli 11243	. . . . 5 ⊢ (i · π) ∈ ℂ
14		efsub 16192	. . . . 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 26814	. . . . . 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 26711	. . . . . 6 ⊢ (exp‘(i · π)) = -1
19	18	a1i 11	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘(i · π)) = -1)
20	17, 19	oveq12d 7434	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((exp‘(log‘𝐴)) / (exp‘(i · π))) = (𝐴 / -1))
21		ax-1cn 11185	. . . . . . 7 ⊢ 1 ∈ ℂ
22		ax-1ne0 11196	. . . . . . 7 ⊢ 1 ≠ 0
23		divneg2 11966	. . . . . . 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 11931	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴 / 1) = 𝐴)
26	25	negeqd 11478	. . . . . 6 ⊢ (𝐴 ∈ ℂ → -(𝐴 / 1) = -𝐴)
27	24, 26	eqtr3d 2799	. . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐴 / -1) = -𝐴)
28	27	adantr 486	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (𝐴 / -1) = -𝐴)
29	15, 20, 28	3eqtrd 2801	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (exp‘((log‘𝐴) − (i · π))) = -𝐴)
30	29	fveq2d 6886	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (log‘(exp‘((log‘𝐴) − (i · π)))) = (log‘-𝐴))
31		subcl 11483	. . . . 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 26850	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ (0(,)π))
34		eliooord 13460	. . . . . . . . 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 15200	. . . . . . . . 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 26692	. . . . . . . . 9 ⊢ π ∈ ℝ
40	39	renegcli 11546	. . . . . . . 8 ⊢ -π ∈ ℝ
41		ltaddpos2 11732	. . . . . . . 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 11264	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘(log‘𝐴)) ∈ ℂ)
45		negsub 11533	. . . . . . 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 5135	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < ((ℑ‘(log‘𝐴)) − π))
48		imsub 15224	. . . . . . 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 15198	. . . . . . . . 9 ⊢ (π ∈ ℂ → (ℜ‘π) = (ℑ‘(i · π)))
51	12, 50	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = (ℑ‘(i · π))
52		rere 15211	. . . . . . . . 9 ⊢ (π ∈ ℝ → (ℜ‘π) = π)
53	39, 52	ax-mp 5	. . . . . . . 8 ⊢ (ℜ‘π) = π
54	51, 53	eqtr3i 2787	. . . . . . 7 ⊢ (ℑ‘(i · π)) = π
55	54	oveq2i 7427	. . . . . 6 ⊢ ((ℑ‘(log‘𝐴)) − (ℑ‘(i · π))) = ((ℑ‘(log‘𝐴)) − π)
56	49, 55	eqtrdi 2813	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) = ((ℑ‘(log‘𝐴)) − π))
57	47, 56	breqtrrd 5137	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → -π < (ℑ‘((log‘𝐴) − (i · π))))
58		resubcl 11549	. . . . . . 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 11237	. . . . . . . 8 ⊢ 0 ∈ ℝ
62		pipos 26696	. . . . . . . 8 ⊢ 0 < π
63	61, 39, 62	ltleii 11360	. . . . . . 7 ⊢ 0 ≤ π
64		subge02 11757	. . . . . . . 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 26807	. . . . . . . 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 11394	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → ((ℑ‘(log‘𝐴)) − π) ≤ π)
71	56, 70	eqbrtrd 5131	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 < (ℑ‘𝐴)) → (ℑ‘((log‘𝐴) − (i · π))) ≤ π)
72		ellogrn 26797	. . . 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 26819	. . 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 2799	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 2957 class class class wbr 5107 ran crn 5660 ‘cfv 6537 (class class class)co 7416 ℂcc 11125 ℝcr 11126 0cc0 11127 1c1 11128 ici 11129 + caddc 11130 · cmul 11132 < clt 11270 ≤ cle 11271 − cmin 11468 -cneg 11469 / cdiv 11898 (,)cioo 13400 ℜcre 15186 ℑcim 15187 expce 16151 πcpi 16156 logclog 26792

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 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-inf2 9623 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 ax-pre-sup 11205 ax-addf 11206

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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-tp 4592 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-iin 4957 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 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 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-of 7681 df-om 7866 df-1st 7989 df-2nd 7990 df-supp 8162 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8458 df-2o 8459 df-er 8699 df-map 8831 df-pm 8832 df-ixp 8908 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-fsupp 9335 df-fi 9384 df-sup 9415 df-inf 9416 df-oi 9485 df-card 9947 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-2 12330 df-3 12331 df-4 12332 df-5 12333 df-6 12334 df-7 12335 df-8 12336 df-9 12337 df-n0 12532 df-z 12619 df-dec 12740 df-uz 12891 df-q 13001 df-rp 13045 df-xneg 13165 df-xadd 13166 df-xmul 13167 df-ioo 13404 df-ioc 13405 df-ico 13406 df-icc 13407 df-fz 13564 df-fzo 13712 df-fl 13855 df-mod 13933 df-seq 14068 df-exp 14128 df-fac 14340 df-bc 14369 df-hash 14397 df-shft 15142 df-cj 15188 df-re 15189 df-im 15190 df-sqrt 15324 df-abs 15325 df-limsup 15560 df-clim 15577 df-rlim 15578 df-sum 15776 df-ef 16157 df-sin 16159 df-cos 16160 df-pi 16162 df-struct 17243 df-sets 17260 df-slot 17278 df-ndx 17290 df-base 17306 df-ress 17327 df-plusg 17359 df-mulr 17360 df-starv 17361 df-sca 17362 df-vsca 17363 df-ip 17364 df-tset 17365 df-ple 17366 df-ds 17368 df-unif 17369 df-hom 17370 df-cco 17371 df-rest 17511 df-topn 17512 df-0g 17530 df-gsum 17531 df-topgen 17532 df-pt 17533 df-prds 17536 df-xrs 17592 df-qtop 17597 df-imas 17598 df-xps 17600 df-mre 17674 df-mrc 17675 df-acs 17677 df-mgm 18734 df-sgrp 18825 df-mnd 18841 df-submnd 18896 df-mulg 19195 df-cntz 19448 df-cmn 19913 df-psmet 21581 df-xmet 21582 df-met 21583 df-bl 21584 df-mopn 21585 df-fbas 21586 df-fg 21587 df-cnfld 21590 df-top 23123 df-topon 23140 df-topsp 23162 df-bases 23175 df-cld 23248 df-ntr 23249 df-cls 23250 df-nei 23327 df-lp 23365 df-perf 23366 df-cn 23456 df-cnp 23457 df-haus 23544 df-tx 23792 df-hmeo 23985 df-fil 24076 df-fm 24168 df-flim 24169 df-flf 24170 df-xms 24550 df-ms 24551 df-tms 24552 df-cncf 25110 df-limc 26098 df-dv 26099 df-log 26794

This theorem is used by: atanlogsublem 27153

W3C validator