eflogeq - Metamath Proof Explorer

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Theorem eflogeq 25193

Description: Solve an equation involving an exponential. (Contributed by Mario Carneiro, 23-Apr-2015.)

**Assertion**
Ref	Expression
eflogeq	⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ((exp‘𝐴) = 𝐵 ↔ ∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))

Distinct variable groups: 𝐴,𝑛 𝐵,𝑛

**Proof of Theorem eflogeq**
Step	Hyp	Ref	Expression
1		efcl 15428	. . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (exp‘𝐴) ∈ ℂ)
2		efne0 15442	. . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (exp‘𝐴) ≠ 0)
3	1, 2	logcld 25162	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (log‘(exp‘𝐴)) ∈ ℂ)
4		efsub 15445	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (log‘(exp‘𝐴)) ∈ ℂ) → (exp‘(𝐴 − (log‘(exp‘𝐴)))) = ((exp‘𝐴) / (exp‘(log‘(exp‘𝐴)))))
5	3, 4	mpdan 686	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (exp‘(𝐴 − (log‘(exp‘𝐴)))) = ((exp‘𝐴) / (exp‘(log‘(exp‘𝐴)))))
6		eflog 25168	. . . . . . . . 9 ⊢ (((exp‘𝐴) ∈ ℂ ∧ (exp‘𝐴) ≠ 0) → (exp‘(log‘(exp‘𝐴))) = (exp‘𝐴))
7	1, 2, 6	syl2anc 587	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (exp‘(log‘(exp‘𝐴))) = (exp‘𝐴))
8	7	oveq2d 7151	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((exp‘𝐴) / (exp‘(log‘(exp‘𝐴)))) = ((exp‘𝐴) / (exp‘𝐴)))
9	1, 2	dividd 11403	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((exp‘𝐴) / (exp‘𝐴)) = 1)
10	5, 8, 9	3eqtrd 2837	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (exp‘(𝐴 − (log‘(exp‘𝐴)))) = 1)
11		subcl 10874	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (log‘(exp‘𝐴)) ∈ ℂ) → (𝐴 − (log‘(exp‘𝐴))) ∈ ℂ)
12	3, 11	mpdan 686	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴 − (log‘(exp‘𝐴))) ∈ ℂ)
13		efeq1 25120	. . . . . . 7 ⊢ ((𝐴 − (log‘(exp‘𝐴))) ∈ ℂ → ((exp‘(𝐴 − (log‘(exp‘𝐴)))) = 1 ↔ ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) ∈ ℤ))
14	12, 13	syl 17	. . . . . 6 ⊢ (𝐴 ∈ ℂ → ((exp‘(𝐴 − (log‘(exp‘𝐴)))) = 1 ↔ ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) ∈ ℤ))
15	10, 14	mpbid 235	. . . . 5 ⊢ (𝐴 ∈ ℂ → ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) ∈ ℤ)
16		ax-icn 10585	. . . . . . . . . 10 ⊢ i ∈ ℂ
17		2cn 11700	. . . . . . . . . . 11 ⊢ 2 ∈ ℂ
18		picn 25052	. . . . . . . . . . 11 ⊢ π ∈ ℂ
19	17, 18	mulcli 10637	. . . . . . . . . 10 ⊢ (2 · π) ∈ ℂ
20	16, 19	mulcli 10637	. . . . . . . . 9 ⊢ (i · (2 · π)) ∈ ℂ
21	20	a1i 11	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (i · (2 · π)) ∈ ℂ)
22		ine0 11064	. . . . . . . . . 10 ⊢ i ≠ 0
23		2ne0 11729	. . . . . . . . . . 11 ⊢ 2 ≠ 0
24		pire 25051	. . . . . . . . . . . 12 ⊢ π ∈ ℝ
25		pipos 25053	. . . . . . . . . . . 12 ⊢ 0 < π
26	24, 25	gt0ne0ii 11165	. . . . . . . . . . 11 ⊢ π ≠ 0
27	17, 18, 23, 26	mulne0i 11272	. . . . . . . . . 10 ⊢ (2 · π) ≠ 0
28	16, 19, 22, 27	mulne0i 11272	. . . . . . . . 9 ⊢ (i · (2 · π)) ≠ 0
29	28	a1i 11	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (i · (2 · π)) ≠ 0)
30	12, 21, 29	divcan2d 11407	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π)))) = (𝐴 − (log‘(exp‘𝐴))))
31	30	oveq2d 7151	. . . . . 6 ⊢ (𝐴 ∈ ℂ → ((log‘(exp‘𝐴)) + ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))))) = ((log‘(exp‘𝐴)) + (𝐴 − (log‘(exp‘𝐴)))))
32		pncan3 10883	. . . . . . 7 ⊢ (((log‘(exp‘𝐴)) ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((log‘(exp‘𝐴)) + (𝐴 − (log‘(exp‘𝐴)))) = 𝐴)
33	3, 32	mpancom 687	. . . . . 6 ⊢ (𝐴 ∈ ℂ → ((log‘(exp‘𝐴)) + (𝐴 − (log‘(exp‘𝐴)))) = 𝐴)
34	31, 33	eqtr2d 2834	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))))))
35		oveq2 7143	. . . . . . 7 ⊢ (𝑛 = ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) → ((i · (2 · π)) · 𝑛) = ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π)))))
36	35	oveq2d 7151	. . . . . 6 ⊢ (𝑛 = ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) → ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)) = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))))))
37	36	rspceeqv 3586	. . . . 5 ⊢ ((((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) ∈ ℤ ∧ 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π)))))) → ∃𝑛 ∈ ℤ 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)))
38	15, 34, 37	syl2anc 587	. . . 4 ⊢ (𝐴 ∈ ℂ → ∃𝑛 ∈ ℤ 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)))
39	38	3ad2ant1 1130	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ∃𝑛 ∈ ℤ 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)))
40		fveq2 6645	. . . . . 6 ⊢ ((exp‘𝐴) = 𝐵 → (log‘(exp‘𝐴)) = (log‘𝐵))
41	40	oveq1d 7150	. . . . 5 ⊢ ((exp‘𝐴) = 𝐵 → ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)) = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)))
42	41	eqeq2d 2809	. . . 4 ⊢ ((exp‘𝐴) = 𝐵 → (𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)) ↔ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))
43	42	rexbidv 3256	. . 3 ⊢ ((exp‘𝐴) = 𝐵 → (∃𝑛 ∈ ℤ 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)) ↔ ∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))
44	39, 43	syl5ibcom 248	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ((exp‘𝐴) = 𝐵 → ∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))
45		logcl 25160	. . . . . . 7 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (log‘𝐵) ∈ ℂ)
46	45	3adant1 1127	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (log‘𝐵) ∈ ℂ)
47		zcn 11974	. . . . . . . 8 ⊢ (𝑛 ∈ ℤ → 𝑛 ∈ ℂ)
48	47	adantl 485	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → 𝑛 ∈ ℂ)
49		mulcl 10610	. . . . . . 7 ⊢ (((i · (2 · π)) ∈ ℂ ∧ 𝑛 ∈ ℂ) → ((i · (2 · π)) · 𝑛) ∈ ℂ)
50	20, 48, 49	sylancr 590	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → ((i · (2 · π)) · 𝑛) ∈ ℂ)
51		efadd 15439	. . . . . 6 ⊢ (((log‘𝐵) ∈ ℂ ∧ ((i · (2 · π)) · 𝑛) ∈ ℂ) → (exp‘((log‘𝐵) + ((i · (2 · π)) · 𝑛))) = ((exp‘(log‘𝐵)) · (exp‘((i · (2 · π)) · 𝑛))))
52	46, 50, 51	syl2an2r 684	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (exp‘((log‘𝐵) + ((i · (2 · π)) · 𝑛))) = ((exp‘(log‘𝐵)) · (exp‘((i · (2 · π)) · 𝑛))))
53		eflog 25168	. . . . . . 7 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (exp‘(log‘𝐵)) = 𝐵)
54	53	3adant1 1127	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (exp‘(log‘𝐵)) = 𝐵)
55		ef2kpi 25071	. . . . . 6 ⊢ (𝑛 ∈ ℤ → (exp‘((i · (2 · π)) · 𝑛)) = 1)
56	54, 55	oveqan12d 7154	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → ((exp‘(log‘𝐵)) · (exp‘((i · (2 · π)) · 𝑛))) = (𝐵 · 1))
57		simpl2 1189	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → 𝐵 ∈ ℂ)
58	57	mulid1d 10647	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (𝐵 · 1) = 𝐵)
59	52, 56, 58	3eqtrd 2837	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (exp‘((log‘𝐵) + ((i · (2 · π)) · 𝑛))) = 𝐵)
60		fveqeq2 6654	. . . 4 ⊢ (𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)) → ((exp‘𝐴) = 𝐵 ↔ (exp‘((log‘𝐵) + ((i · (2 · π)) · 𝑛))) = 𝐵))
61	59, 60	syl5ibrcom 250	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)) → (exp‘𝐴) = 𝐵))
62	61	rexlimdva 3243	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)) → (exp‘𝐴) = 𝐵))
63	44, 62	impbid 215	1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ((exp‘𝐴) = 𝐵 ↔ ∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∧ w3a 1084 = wceq 1538 ∈ wcel 2111 ≠ wne 2987 ∃wrex 3107 ‘cfv 6324 (class class class)co 7135 ℂcc 10524 0cc0 10526 1c1 10527 ici 10528 + caddc 10529 · cmul 10531 − cmin 10859 / cdiv 11286 2c2 11680 ℤcz 11969 expce 15407 πcpi 15412 logclog 25146

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 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-inf2 9088 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 ax-pre-sup 10604 ax-addf 10605 ax-mulf 10606

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 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-int 4839 df-iun 4883 df-iin 4884 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-se 5479 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-isom 6333 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-of 7389 df-om 7561 df-1st 7671 df-2nd 7672 df-supp 7814 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-1o 8085 df-2o 8086 df-oadd 8089 df-er 8272 df-map 8391 df-pm 8392 df-ixp 8445 df-en 8493 df-dom 8494 df-sdom 8495 df-fin 8496 df-fsupp 8818 df-fi 8859 df-sup 8890 df-inf 8891 df-oi 8958 df-card 9352 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-div 11287 df-nn 11626 df-2 11688 df-3 11689 df-4 11690 df-5 11691 df-6 11692 df-7 11693 df-8 11694 df-9 11695 df-n0 11886 df-z 11970 df-dec 12087 df-uz 12232 df-q 12337 df-rp 12378 df-xneg 12495 df-xadd 12496 df-xmul 12497 df-ioo 12730 df-ioc 12731 df-ico 12732 df-icc 12733 df-fz 12886 df-fzo 13029 df-fl 13157 df-mod 13233 df-seq 13365 df-exp 13426 df-fac 13630 df-bc 13659 df-hash 13687 df-shft 14418 df-cj 14450 df-re 14451 df-im 14452 df-sqrt 14586 df-abs 14587 df-limsup 14820 df-clim 14837 df-rlim 14838 df-sum 15035 df-ef 15413 df-sin 15415 df-cos 15416 df-pi 15418 df-struct 16477 df-ndx 16478 df-slot 16479 df-base 16481 df-sets 16482 df-ress 16483 df-plusg 16570 df-mulr 16571 df-starv 16572 df-sca 16573 df-vsca 16574 df-ip 16575 df-tset 16576 df-ple 16577 df-ds 16579 df-unif 16580 df-hom 16581 df-cco 16582 df-rest 16688 df-topn 16689 df-0g 16707 df-gsum 16708 df-topgen 16709 df-pt 16710 df-prds 16713 df-xrs 16767 df-qtop 16772 df-imas 16773 df-xps 16775 df-mre 16849 df-mrc 16850 df-acs 16852 df-mgm 17844 df-sgrp 17893 df-mnd 17904 df-submnd 17949 df-mulg 18217 df-cntz 18439 df-cmn 18900 df-psmet 20083 df-xmet 20084 df-met 20085 df-bl 20086 df-mopn 20087 df-fbas 20088 df-fg 20089 df-cnfld 20092 df-top 21499 df-topon 21516 df-topsp 21538 df-bases 21551 df-cld 21624 df-ntr 21625 df-cls 21626 df-nei 21703 df-lp 21741 df-perf 21742 df-cn 21832 df-cnp 21833 df-haus 21920 df-tx 22167 df-hmeo 22360 df-fil 22451 df-fm 22543 df-flim 22544 df-flf 22545 df-xms 22927 df-ms 22928 df-tms 22929 df-cncf 23483 df-limc 24469 df-dv 24470 df-log 25148

This theorem is referenced by: cxpeq 25346

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