-S^.l ) ^6 C «.c2- 



11 infiiper acccdat 



tnus terniinus 



duo _ - . 



tres - - - 



qiiatuor 



quinqiic 



fcx - - - 



fcpicm 



odo - - - 



fumma erit 



X 



I — a 



— a. 

 o 



a 

 a — \ 



— I 

 o 



quariim oc^o fnmmarum aggrcgattim c(l o, vndc tnfo 

 concludimus totius huius fcriei, qiiam inuenimus, in infi- 

 nitum continuatac fummam cflc — o. 



§. 17. Hinc patct , fummam luiius fcrici periodi- 

 cac pcrindc nihilo acquari , (]iicmcunquc v.ilorcm habucrit 

 littcra a\ vcrus cnim valor ipfius a, quo cll aazri, iam 

 in conflderationem cft dudus, dum ipfic pcriodi cx cO 

 funt natae; quamcbrcm haec feries in duas partcs difpcf.i 

 poicfl, quHrum altcia contincit Iblas vnitatcs, altcra vc- 

 ro fflas littcr.is a\ ac ncccffc cfl, vt vtnifsquc fumma 

 fcorfim nihilo fl.it acqudiis, ita vt fit 



i-i — i-fi, -fi — I — i + i, +1-1 — i-fi» ctc.ro 

 — a-fa+a-a, — afa-fa-a, -a-fa + a-a, etc.ro, 

 vtriusqnc autcm vcritas cx pofitis principiis fit manifcfla. 



§. 18. Simili modo rcs fc h:ib>.bit in radicibus 

 cubicis ipfUis i, p(»ncndo a' — i , ct quoniam pcriodi ad 

 pUiics tcrminos cxcurrcnt, fcricm ecncr.dcm pcr binos 

 tcrminoi fibi fubfcri^ tos rcfcramus, vt fit in gcncic 



I — 



