eflogeq - Metamath Proof Explorer

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Theorem eflogeq 26554

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 16064	. . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (exp‘𝐴) ∈ ℂ)
2		efne0 16079	. . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (exp‘𝐴) ≠ 0)
3	1, 2	logcld 26522	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (log‘(exp‘𝐴)) ∈ ℂ)
4		efsub 16082	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (log‘(exp‘𝐴)) ∈ ℂ) → (exp‘(𝐴 − (log‘(exp‘𝐴)))) = ((exp‘𝐴) / (exp‘(log‘(exp‘𝐴)))))
5	3, 4	mpdan 685	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (exp‘(𝐴 − (log‘(exp‘𝐴)))) = ((exp‘𝐴) / (exp‘(log‘(exp‘𝐴)))))
6		eflog 26528	. . . . . . . . 9 ⊢ (((exp‘𝐴) ∈ ℂ ∧ (exp‘𝐴) ≠ 0) → (exp‘(log‘(exp‘𝐴))) = (exp‘𝐴))
7	1, 2, 6	syl2anc 582	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (exp‘(log‘(exp‘𝐴))) = (exp‘𝐴))
8	7	oveq2d 7440	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((exp‘𝐴) / (exp‘(log‘(exp‘𝐴)))) = ((exp‘𝐴) / (exp‘𝐴)))
9	1, 2	dividd 12024	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((exp‘𝐴) / (exp‘𝐴)) = 1)
10	5, 8, 9	3eqtrd 2771	. . . . . 6 ⊢ (𝐴 ∈ ℂ → (exp‘(𝐴 − (log‘(exp‘𝐴)))) = 1)
11		subcl 11495	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (log‘(exp‘𝐴)) ∈ ℂ) → (𝐴 − (log‘(exp‘𝐴))) ∈ ℂ)
12	3, 11	mpdan 685	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → (𝐴 − (log‘(exp‘𝐴))) ∈ ℂ)
13		efeq1 26480	. . . . . . 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 231	. . . . 5 ⊢ (𝐴 ∈ ℂ → ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))) ∈ ℤ)
16		ax-icn 11203	. . . . . . . . . 10 ⊢ i ∈ ℂ
17		2cn 12323	. . . . . . . . . . 11 ⊢ 2 ∈ ℂ
18		picn 26412	. . . . . . . . . . 11 ⊢ π ∈ ℂ
19	17, 18	mulcli 11257	. . . . . . . . . 10 ⊢ (2 · π) ∈ ℂ
20	16, 19	mulcli 11257	. . . . . . . . 9 ⊢ (i · (2 · π)) ∈ ℂ
21	20	a1i 11	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (i · (2 · π)) ∈ ℂ)
22		ine0 11685	. . . . . . . . . 10 ⊢ i ≠ 0
23		2ne0 12352	. . . . . . . . . . 11 ⊢ 2 ≠ 0
24		pire 26411	. . . . . . . . . . . 12 ⊢ π ∈ ℝ
25		pipos 26413	. . . . . . . . . . . 12 ⊢ 0 < π
26	24, 25	gt0ne0ii 11786	. . . . . . . . . . 11 ⊢ π ≠ 0
27	17, 18, 23, 26	mulne0i 11893	. . . . . . . . . 10 ⊢ (2 · π) ≠ 0
28	16, 19, 22, 27	mulne0i 11893	. . . . . . . . 9 ⊢ (i · (2 · π)) ≠ 0
29	28	a1i 11	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (i · (2 · π)) ≠ 0)
30	12, 21, 29	divcan2d 12028	. . . . . . 7 ⊢ (𝐴 ∈ ℂ → ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π)))) = (𝐴 − (log‘(exp‘𝐴))))
31	30	oveq2d 7440	. . . . . 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 11504	. . . . . . 7 ⊢ (((log‘(exp‘𝐴)) ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((log‘(exp‘𝐴)) + (𝐴 − (log‘(exp‘𝐴)))) = 𝐴)
33	3, 32	mpancom 686	. . . . . 6 ⊢ (𝐴 ∈ ℂ → ((log‘(exp‘𝐴)) + (𝐴 − (log‘(exp‘𝐴)))) = 𝐴)
34	31, 33	eqtr2d 2768	. . . . 5 ⊢ (𝐴 ∈ ℂ → 𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · ((𝐴 − (log‘(exp‘𝐴))) / (i · (2 · π))))))
35		oveq2 7432	. . . . . . 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 7440	. . . . . 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 3631	. . . . 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 582	. . . 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 6900	. . . . . 6 ⊢ ((exp‘𝐴) = 𝐵 → (log‘(exp‘𝐴)) = (log‘𝐵))
41	40	oveq1d 7439	. . . . 5 ⊢ ((exp‘𝐴) = 𝐵 → ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)) = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)))
42	41	eqeq2d 2738	. . . 4 ⊢ ((exp‘𝐴) = 𝐵 → (𝐴 = ((log‘(exp‘𝐴)) + ((i · (2 · π)) · 𝑛)) ↔ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))
43	42	rexbidv 3174	. . 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 244	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → ((exp‘𝐴) = 𝐵 → ∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛))))
45		logcl 26520	. . . . . . 7 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (log‘𝐵) ∈ ℂ)
46	45	3adant1 1127	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (log‘𝐵) ∈ ℂ)
47		zcn 12599	. . . . . . . 8 ⊢ (𝑛 ∈ ℤ → 𝑛 ∈ ℂ)
48	47	adantl 480	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → 𝑛 ∈ ℂ)
49		mulcl 11228	. . . . . . 7 ⊢ (((i · (2 · π)) ∈ ℂ ∧ 𝑛 ∈ ℂ) → ((i · (2 · π)) · 𝑛) ∈ ℂ)
50	20, 48, 49	sylancr 585	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → ((i · (2 · π)) · 𝑛) ∈ ℂ)
51		efadd 16076	. . . . . 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 683	. . . . 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 26528	. . . . . . 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 26431	. . . . . 6 ⊢ (𝑛 ∈ ℤ → (exp‘((i · (2 · π)) · 𝑛)) = 1)
56	54, 55	oveqan12d 7443	. . . . 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	mulridd 11267	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (𝐵 · 1) = 𝐵)
59	52, 56, 58	3eqtrd 2771	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (exp‘((log‘𝐵) + ((i · (2 · π)) · 𝑛))) = 𝐵)
60		fveqeq2 6909	. . . 4 ⊢ (𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)) → ((exp‘𝐴) = 𝐵 ↔ (exp‘((log‘𝐵) + ((i · (2 · π)) · 𝑛))) = 𝐵))
61	59, 60	syl5ibrcom 246	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) ∧ 𝑛 ∈ ℤ) → (𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)) → (exp‘𝐴) = 𝐵))
62	61	rexlimdva 3151	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (∃𝑛 ∈ ℤ 𝐴 = ((log‘𝐵) + ((i · (2 · π)) · 𝑛)) → (exp‘𝐴) = 𝐵))
63	44, 62	impbid 211	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 205 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2936 ∃wrex 3066 ‘cfv 6551 (class class class)co 7424 ℂcc 11142 0cc0 11144 1c1 11145 ici 11146 + caddc 11147 · cmul 11149 − cmin 11480 / cdiv 11907 2c2 12303 ℤcz 12594 expce 16043 πcpi 16048 logclog 26506

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2698 ax-rep 5287 ax-sep 5301 ax-nul 5308 ax-pow 5367 ax-pr 5431 ax-un 7744 ax-inf2 9670 ax-cnex 11200 ax-resscn 11201 ax-1cn 11202 ax-icn 11203 ax-addcl 11204 ax-addrcl 11205 ax-mulcl 11206 ax-mulrcl 11207 ax-mulcom 11208 ax-addass 11209 ax-mulass 11210 ax-distr 11211 ax-i2m1 11212 ax-1ne0 11213 ax-1rid 11214 ax-rnegex 11215 ax-rrecex 11216 ax-cnre 11217 ax-pre-lttri 11218 ax-pre-lttrn 11219 ax-pre-ltadd 11220 ax-pre-mulgt0 11221 ax-pre-sup 11222 ax-addf 11223

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4325 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-tp 4635 df-op 4637 df-uni 4911 df-int 4952 df-iun 5000 df-iin 5001 df-br 5151 df-opab 5213 df-mpt 5234 df-tr 5268 df-id 5578 df-eprel 5584 df-po 5592 df-so 5593 df-fr 5635 df-se 5636 df-we 5637 df-xp 5686 df-rel 5687 df-cnv 5688 df-co 5689 df-dm 5690 df-rn 5691 df-res 5692 df-ima 5693 df-pred 6308 df-ord 6375 df-on 6376 df-lim 6377 df-suc 6378 df-iota 6503 df-fun 6553 df-fn 6554 df-f 6555 df-f1 6556 df-fo 6557 df-f1o 6558 df-fv 6559 df-isom 6560 df-riota 7380 df-ov 7427 df-oprab 7428 df-mpo 7429 df-of 7689 df-om 7875 df-1st 7997 df-2nd 7998 df-supp 8170 df-frecs 8291 df-wrecs 8322 df-recs 8396 df-rdg 8435 df-1o 8491 df-2o 8492 df-er 8729 df-map 8851 df-pm 8852 df-ixp 8921 df-en 8969 df-dom 8970 df-sdom 8971 df-fin 8972 df-fsupp 9392 df-fi 9440 df-sup 9471 df-inf 9472 df-oi 9539 df-card 9968 df-pnf 11286 df-mnf 11287 df-xr 11288 df-ltxr 11289 df-le 11290 df-sub 11482 df-neg 11483 df-div 11908 df-nn 12249 df-2 12311 df-3 12312 df-4 12313 df-5 12314 df-6 12315 df-7 12316 df-8 12317 df-9 12318 df-n0 12509 df-z 12595 df-dec 12714 df-uz 12859 df-q 12969 df-rp 13013 df-xneg 13130 df-xadd 13131 df-xmul 13132 df-ioo 13366 df-ioc 13367 df-ico 13368 df-icc 13369 df-fz 13523 df-fzo 13666 df-fl 13795 df-mod 13873 df-seq 14005 df-exp 14065 df-fac 14271 df-bc 14300 df-hash 14328 df-shft 15052 df-cj 15084 df-re 15085 df-im 15086 df-sqrt 15220 df-abs 15221 df-limsup 15453 df-clim 15470 df-rlim 15471 df-sum 15671 df-ef 16049 df-sin 16051 df-cos 16052 df-pi 16054 df-struct 17121 df-sets 17138 df-slot 17156 df-ndx 17168 df-base 17186 df-ress 17215 df-plusg 17251 df-mulr 17252 df-starv 17253 df-sca 17254 df-vsca 17255 df-ip 17256 df-tset 17257 df-ple 17258 df-ds 17260 df-unif 17261 df-hom 17262 df-cco 17263 df-rest 17409 df-topn 17410 df-0g 17428 df-gsum 17429 df-topgen 17430 df-pt 17431 df-prds 17434 df-xrs 17489 df-qtop 17494 df-imas 17495 df-xps 17497 df-mre 17571 df-mrc 17572 df-acs 17574 df-mgm 18605 df-sgrp 18684 df-mnd 18700 df-submnd 18746 df-mulg 19029 df-cntz 19273 df-cmn 19742 df-psmet 21276 df-xmet 21277 df-met 21278 df-bl 21279 df-mopn 21280 df-fbas 21281 df-fg 21282 df-cnfld 21285 df-top 22814 df-topon 22831 df-topsp 22853 df-bases 22867 df-cld 22941 df-ntr 22942 df-cls 22943 df-nei 23020 df-lp 23058 df-perf 23059 df-cn 23149 df-cnp 23150 df-haus 23237 df-tx 23484 df-hmeo 23677 df-fil 23768 df-fm 23860 df-flim 23861 df-flf 23862 df-xms 24244 df-ms 24245 df-tms 24246 df-cncf 24816 df-limc 25813 df-dv 25814 df-log 26508

This theorem is referenced by: cxpeq 26710

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