== 8 + 



/71 r^ \ 2 (i: — 3> ^ n -4- -. — 3 — >' 



ubi eviflcns eft pofleriorcs fafloies aequales inter fc piodire 

 debuilfc; undc cx additione orielur 



a. 2'x 



In Lemmate igitur noftro fumi dcbct i ~ ■: , indcquc fiet 



U=z A ;. {n 'h = n) (n -h a); 

 quare, ut poftcriores fLiflores congruant, fuini dcbct n'' — n 

 — z^ — Y» tjuibus fublatis rcmanebiL iiaec ucqualio : 



ubi itcrum divifio pcr r^ n — =P — y fuccedit, ita ut 

 liinc A — -i- , confequenter coefnciens quacfilus erit 



(T^r C) =: ^-^ -^^,- , 



— z} — y) {nz — cp — v^ 



a. 2 X- a 



fivc hoc modo 



n{n-i-a — g 3 — y\ (n -4- g j — 2 3 — yi 



l (13^ C) = 



X. 3 a 



§. r'^. Tcitia dcniquc forma huius ordinis cft 13 CD, 

 pro cuius cocfficicnte fupra data eft liacc acquatio : 



(D C D) - (n"c D) =z (C D) H- {n~lJ) -1- (15 C) rr: H, 

 ita ut hic IT componatur cx iribus parlibus, quac ad prae- 

 fcntcs indiccs rcduflae erunt' 





11 — 



— 2(n-^' . - , ^ J) 



ubi 



