18 A. MAPKOBTi. 



npn u = 0, to pa3iiocTb nocii naAJiemamaro coKpamenin npnBOAHTCH Kb Tanon Apoon, ana- 



MeHaie^b KOTopofi coAepjKHTi MHOJKn-rejib 1 — z wh CTeneHH Menbiuen y -♦- 1 . 



ConocTaBJiflfl 3tott> pesyjibTaTi ch <i>opMyjion (19) h npHUHMaa bt> BHRMame o6o3HaHci]in 

 (18), aaKJEO^aeMi, hto npn i HeieTHOMt pa3CMaTpHBaeiuoe Hanin BbipameHie 



d l ( f(e u \za-"") 

 (12) 



du l \F(e u ,ze- au )J u=l) 



npHBOAHTCfl kt> TaKOH panjoHajibHOH apo6hoh ^ynKuin "JHCia z, 3uaMeHaTe;ib KOTopon coAepJKHTi 

 MuoatHTejib 1 — z bt> deneHH Meubuien y-*-l. 



A OTCioAa, bt> CHjy BbiBOAOBi nscjiiAOBanin §§ 3 h 4, TOTqact BbiTCKaerb, ito npn i 

 HeqeTHOMi> OTnomenie 



.MaTCM. ojkjia- (^ -+- x 2 •+- . . . . -*- x n — na) 1 



AOjijkho npnQjiHaiaTbcn kt> npeA'fejiy nyjib, KGTAa n B03pacTaerb 6e3npeA'fejibHO. 



He TpyAHO TaiOKe naiiTH Ty npocTyw ApoSb co 3uaMeHaTejieM-b (1 — z) 2 , KOTopyw uaAO 

 BbiA'feJiHTb 03i Bbipaaccnifl (12), qToSbi 3iiaMeHaTCJib ocTaTKa ne coAepjKajn. mhohuitcjih 



(1 — z) 2 , a Mori coAepataTb TOJbKO HH3iniH CTeneim 1 — z. 



Bt> caMOMi A'BJi'B 3Ta Apo6b AOJUKna coBnaAaTb ci toh, no BbWEJieHin KOTopoii H3t> bm- 

 paateHifl 



i.2.3..../; / u\ / — v 



r"\ 2 



V I \ V I 



Z m 



ocTaeTCH Apo6b, ne coAepatamaa bt> 3HaiuenaTexE muoacHTejifl 1 — z bt> CTeneHH Bbiine 4 !• 



Ha 3TOMT) ocuoBaniH, npHHHMafl bo BHHMauie paBencTBo 



do) . m =-u 



ycTaHOBJieHHoe bt> § 2, HaxoAHMt, ito ncKOiuyio Apo6b mojkbo npeACTaBHTb b^ TanoMi bha^ 



1.2.3 % G 2 



