DE SESIEB. QVmVSD. CDNSIDERyfT. 69 



coefGcientes A,B, C, etc. haac tenebutx legem : 

 A=i 

 B— * 



Qiiodfi auteiTi illae feries retro continuentur , vt ad pote- 

 ftates affirmatiuas deueniatur , erunt omnium illarum ierie- 

 rum fummae zz: o ; ita vt etiamfi in his formis vlterius 

 progrederemur , tamen alii valores non prodituri eflent. 

 Eft fcilicet 



I-3W-5 -7 -^-p-etc. = 



i-3'-4-5'-7'-l-9'-etc. — o 



i-3*-H5'-7'H-9'-etc.i=:o 



I -3^-1- 5^-7^-^-9^- etc. — o 



§, 20. Quemadmodum autem fummae poteftatum im- 

 parium peculiarem inter fe tenent progreirionis legem , ita 

 etiam poteftates pares fimili proprietate gaudent, vt omnes 

 ex le ipfis fine (ubfidio poteftatum imparium definiri queant. 

 Quam legem vt eruamus, fimUi vtamur operatione. Sit igitur 



.-f-i*4-^-f- etc. — Att' 



♦ -I-i*-|-|*^- etc. ^zBtt* 



«-i-7«-H|6-H etc. zirCTr' 



.-Hy.-M.-l-etc. —Dtt' 

 ac inueftigetur fiimma huius (eriei : 

 A -K z -}- B TT* 5;* + C tt' 2*^ -i- D tt' z' H- etc — /^ 

 erit i — ,-1:^ -H p^ + ^-^ -4- ^^ ^ €tc, vnde ex 

 I 3 t 17- 



1-4-^«-+- 



