§. 14.. Ex hac igitur aeqimtionc iniicRigari dcbct fc- 

 ries valorem ipfius 9 exhibcns, vbi ;iiue omni:i principium Ini- 

 ius ferici indc conftitui oportet, quod pofito u n:: o fieri de- 

 be:it s zzi i ct qznl-hl; vnde p:itet fcrici pro q fingend:ie 

 primum tcrminum efrc debere l; tum vcro f;icile pcrfpicitur 

 in hac fcrie poteflatcs ipfius u tantum imp;ircs affumi debcre. 

 Quamobrem fingatur ifta feries: 



q z^ l-{- a u -\- If iP -f- c u^ -\- d u- -{- eu- -f- etc. eritque 



^^ — — -*-2«-+--^«"-+- 2.i-if*-+- idu''-^ 2cu^-i- -J u^' -h etc. 



~\- a a -^ 2.a b -h ia c -\- zad-it- lae -h etc. 



-\- b b -^-ibc-h^^-bd-h etc. 



-\- c c 



ii — — — -I- fl-f-3^ -4- Sc -f- 7^/-}- 9f-hii/~-l- ctc. 



harum crgo fcricrum fumma dcbct effc 4, vndc dcducuntur 

 fequentcs determinationcs: 



3 fl — i ergo a = /. 



^ b ~\- a a ~ o t^ — — -- 



7 . z a b 



^ c -\~ "^ a u :zz. o c — — — — 



^ d-\- ":. a c -\-b b :=zo <^ ~ — ' ° " ~ — 



r\ t -\- z a d -\- •: b c — o e — — ~ 



j2f-\-zac-^-2bd-hCC — o j — — 



ctc. ctc. 



cx quibus formulis valores numerici littcrarum a^ b, r, d, 

 computari potcrunt. 



§. 15. His aiitem h"ttcris a, b, r, r/, etc. dcfinitis 

 ipfa fcries pro s quacfita crit 



/ — 1 



