iprodefisum - Mathbox for Scott Fenton

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Theorem iprodefisum 35701

Description: Applying the exponential function to an infinite sum yields an infinite product. (Contributed by Scott Fenton, 11-Feb-2018.)

**Hypotheses**
Ref	Expression
iprodefisum.1	⊢ 𝑍 = (ℤ_≥‘𝑀)
iprodefisum.2	⊢ (𝜑 → 𝑀 ∈ ℤ)
iprodefisum.3	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = 𝐵)
iprodefisum.4	⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℂ)
iprodefisum.5	⊢ (𝜑 → seq𝑀( + , 𝐹) ∈ dom ⇝ )

**Assertion**
Ref	Expression
iprodefisum	⊢ (𝜑 → ∏𝑘 ∈ 𝑍 (exp‘𝐵) = (exp‘Σ𝑘 ∈ 𝑍 𝐵))

Distinct variable groups: 𝑘,𝐹 𝜑,𝑘 𝑘,𝑀 𝑘,𝑍 Allowed substitution hint: 𝐵(𝑘)

Proof of Theorem iprodefisum Dummy variable 𝑗 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		iprodefisum.1	. 2 ⊢ 𝑍 = (ℤ_≥‘𝑀)
2		iprodefisum.2	. 2 ⊢ (𝜑 → 𝑀 ∈ ℤ)
3		iprodefisum.3	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) = 𝐵)
4		iprodefisum.4	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → 𝐵 ∈ ℂ)
5		iprodefisum.5	. . . 4 ⊢ (𝜑 → seq𝑀( + , 𝐹) ∈ dom ⇝ )
6	1, 2, 3, 4, 5	isumcl 15703	. . 3 ⊢ (𝜑 → Σ𝑘 ∈ 𝑍 𝐵 ∈ ℂ)
7		efne0 16040	. . 3 ⊢ (Σ𝑘 ∈ 𝑍 𝐵 ∈ ℂ → (exp‘Σ𝑘 ∈ 𝑍 𝐵) ≠ 0)
8	6, 7	syl 17	. 2 ⊢ (𝜑 → (exp‘Σ𝑘 ∈ 𝑍 𝐵) ≠ 0)
9		efcn 26329	. . . . 5 ⊢ exp ∈ (ℂ–cn→ℂ)
10	9	a1i 11	. . . 4 ⊢ (𝜑 → exp ∈ (ℂ–cn→ℂ))
11		fveq2 6840	. . . . . . . 8 ⊢ (𝑗 = 𝑘 → (𝐹‘𝑗) = (𝐹‘𝑘))
12		eqid 2729	. . . . . . . 8 ⊢ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)) = (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))
13		fvex 6853	. . . . . . . 8 ⊢ (𝐹‘𝑘) ∈ V
14	11, 12, 13	fvmpt 6950	. . . . . . 7 ⊢ (𝑘 ∈ 𝑍 → ((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘) = (𝐹‘𝑘))
15	14	adantl 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘) = (𝐹‘𝑘))
16	3, 4	eqeltrd 2828	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (𝐹‘𝑘) ∈ ℂ)
17	15, 16	eqeltrd 2828	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘) ∈ ℂ)
18	1, 2, 17	serf 13971	. . . 4 ⊢ (𝜑 → seq𝑀( + , (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))):𝑍⟶ℂ)
19	1	eqcomi 2738	. . . . . . . 8 ⊢ (ℤ_≥‘𝑀) = 𝑍
20	14, 19	eleq2s 2846	. . . . . . 7 ⊢ (𝑘 ∈ (ℤ_≥‘𝑀) → ((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘) = (𝐹‘𝑘))
21	20	adantl 481	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) → ((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘) = (𝐹‘𝑘))
22	2, 21	seqfeq 13968	. . . . 5 ⊢ (𝜑 → seq𝑀( + , (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))) = seq𝑀( + , 𝐹))
23		climdm 15496	. . . . . 6 ⊢ (seq𝑀( + , 𝐹) ∈ dom ⇝ ↔ seq𝑀( + , 𝐹) ⇝ ( ⇝ ‘seq𝑀( + , 𝐹)))
24	5, 23	sylib 218	. . . . 5 ⊢ (𝜑 → seq𝑀( + , 𝐹) ⇝ ( ⇝ ‘seq𝑀( + , 𝐹)))
25	22, 24	eqbrtrd 5124	. . . 4 ⊢ (𝜑 → seq𝑀( + , (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))) ⇝ ( ⇝ ‘seq𝑀( + , 𝐹)))
26		climcl 15441	. . . . 5 ⊢ (seq𝑀( + , 𝐹) ⇝ ( ⇝ ‘seq𝑀( + , 𝐹)) → ( ⇝ ‘seq𝑀( + , 𝐹)) ∈ ℂ)
27	24, 26	syl 17	. . . 4 ⊢ (𝜑 → ( ⇝ ‘seq𝑀( + , 𝐹)) ∈ ℂ)
28	1, 2, 10, 18, 25, 27	climcncf 24769	. . 3 ⊢ (𝜑 → (exp ∘ seq𝑀( + , (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))) ⇝ (exp‘( ⇝ ‘seq𝑀( + , 𝐹))))
29	11	cbvmptv 5206	. . . . 5 ⊢ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)) = (𝑘 ∈ 𝑍 ↦ (𝐹‘𝑘))
30	16, 29	fmptd 7068	. . . 4 ⊢ (𝜑 → (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)):𝑍⟶ℂ)
31	1, 2, 30	iprodefisumlem 35700	. . 3 ⊢ (𝜑 → seq𝑀( · , (exp ∘ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))) = (exp ∘ seq𝑀( + , (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))))
32	1, 2, 3, 4	isum 15661	. . . 4 ⊢ (𝜑 → Σ𝑘 ∈ 𝑍 𝐵 = ( ⇝ ‘seq𝑀( + , 𝐹)))
33	32	fveq2d 6844	. . 3 ⊢ (𝜑 → (exp‘Σ𝑘 ∈ 𝑍 𝐵) = (exp‘( ⇝ ‘seq𝑀( + , 𝐹))))
34	28, 31, 33	3brtr4d 5134	. 2 ⊢ (𝜑 → seq𝑀( · , (exp ∘ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))) ⇝ (exp‘Σ𝑘 ∈ 𝑍 𝐵))
35		fvco3 6942	. . . 4 ⊢ (((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)):𝑍⟶ℂ ∧ 𝑘 ∈ 𝑍) → ((exp ∘ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))‘𝑘) = (exp‘((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘)))
36	30, 35	sylan 580	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((exp ∘ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))‘𝑘) = (exp‘((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘)))
37	15	fveq2d 6844	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (exp‘((𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗))‘𝑘)) = (exp‘(𝐹‘𝑘)))
38	3	fveq2d 6844	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (exp‘(𝐹‘𝑘)) = (exp‘𝐵))
39	36, 37, 38	3eqtrd 2768	. 2 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → ((exp ∘ (𝑗 ∈ 𝑍 ↦ (𝐹‘𝑗)))‘𝑘) = (exp‘𝐵))
40		efcl 16024	. . 3 ⊢ (𝐵 ∈ ℂ → (exp‘𝐵) ∈ ℂ)
41	4, 40	syl 17	. 2 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝑍) → (exp‘𝐵) ∈ ℂ)
42	1, 2, 8, 34, 39, 41	iprodn0 15882	1 ⊢ (𝜑 → ∏𝑘 ∈ 𝑍 (exp‘𝐵) = (exp‘Σ𝑘 ∈ 𝑍 𝐵))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ≠ wne 2925 class class class wbr 5102 ↦ cmpt 5183 dom cdm 5631 ∘ ccom 5635 ⟶wf 6495 ‘cfv 6499 (class class class)co 7369 ℂcc 11042 0cc0 11044 + caddc 11047 · cmul 11049 ℤcz 12505 ℤ_≥cuz 12769 seqcseq 13942 ⇝ cli 15426 Σcsu 15628 ∏cprod 15845 expce 16003 –cn→ccncf 24745

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5229 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-inf2 9570 ax-cnex 11100 ax-resscn 11101 ax-1cn 11102 ax-icn 11103 ax-addcl 11104 ax-addrcl 11105 ax-mulcl 11106 ax-mulrcl 11107 ax-mulcom 11108 ax-addass 11109 ax-mulass 11110 ax-distr 11111 ax-i2m1 11112 ax-1ne0 11113 ax-1rid 11114 ax-rnegex 11115 ax-rrecex 11116 ax-cnre 11117 ax-pre-lttri 11118 ax-pre-lttrn 11119 ax-pre-ltadd 11120 ax-pre-mulgt0 11121 ax-pre-sup 11122 ax-addf 11123

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3351 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-tp 4590 df-op 4592 df-uni 4868 df-int 4907 df-iun 4953 df-iin 4954 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-isom 6508 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-of 7633 df-om 7823 df-1st 7947 df-2nd 7948 df-supp 8117 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-1o 8411 df-2o 8412 df-er 8648 df-map 8778 df-pm 8779 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-fsupp 9289 df-fi 9338 df-sup 9369 df-inf 9370 df-oi 9439 df-card 9868 df-pnf 11186 df-mnf 11187 df-xr 11188 df-ltxr 11189 df-le 11190 df-sub 11383 df-neg 11384 df-div 11812 df-nn 12163 df-2 12225 df-3 12226 df-4 12227 df-5 12228 df-6 12229 df-7 12230 df-8 12231 df-9 12232 df-n0 12419 df-z 12506 df-dec 12626 df-uz 12770 df-q 12884 df-rp 12928 df-xneg 13048 df-xadd 13049 df-xmul 13050 df-ico 13288 df-icc 13289 df-fz 13445 df-fzo 13592 df-fl 13730 df-seq 13943 df-exp 14003 df-fac 14215 df-bc 14244 df-hash 14272 df-shft 15009 df-cj 15041 df-re 15042 df-im 15043 df-sqrt 15177 df-abs 15178 df-limsup 15413 df-clim 15430 df-rlim 15431 df-sum 15629 df-prod 15846 df-ef 16009 df-struct 17093 df-sets 17110 df-slot 17128 df-ndx 17140 df-base 17156 df-ress 17177 df-plusg 17209 df-mulr 17210 df-starv 17211 df-sca 17212 df-vsca 17213 df-ip 17214 df-tset 17215 df-ple 17216 df-ds 17218 df-unif 17219 df-hom 17220 df-cco 17221 df-rest 17361 df-topn 17362 df-0g 17380 df-gsum 17381 df-topgen 17382 df-pt 17383 df-prds 17386 df-xrs 17441 df-qtop 17446 df-imas 17447 df-xps 17449 df-mre 17523 df-mrc 17524 df-acs 17526 df-mgm 18543 df-sgrp 18622 df-mnd 18638 df-submnd 18687 df-mulg 18976 df-cntz 19225 df-cmn 19688 df-psmet 21232 df-xmet 21233 df-met 21234 df-bl 21235 df-mopn 21236 df-fbas 21237 df-fg 21238 df-cnfld 21241 df-top 22757 df-topon 22774 df-topsp 22796 df-bases 22809 df-cld 22882 df-ntr 22883 df-cls 22884 df-nei 22961 df-lp 22999 df-perf 23000 df-cn 23090 df-cnp 23091 df-haus 23178 df-tx 23425 df-hmeo 23618 df-fil 23709 df-fm 23801 df-flim 23802 df-flf 23803 df-xms 24184 df-ms 24185 df-tms 24186 df-cncf 24747 df-limc 25743 df-dv 25744

This theorem is referenced by: iprodgam 35702

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