169 



ubi erit ultima ( - ) = ■-■ ». , penultima ( — ) = 



- " — &c. ; at horizontaliter progrediendo : 



. ^ £Z*> - < A £z& — _££_ & c 



quarum erit ultima ( ) = - — ** A penulti- 



ma ( ) = - — '- — -—-— &c. 



Porro a formula ( ) = y defcendendo perveni- 



mus ad has formulas : 



A~^_, r n ~S — P /»-5v __ «a> .»-6 _ «:cde 

 {—)-?, (-p) = C ( T ) - jj, ( T ) - rrj-2 , 



.r^* 



& horizontaliter progrediendo : 



^ 7 ; 4«/J£)£F , ^ 8 ' 5«^£FG 



Pari modo a formula ( — ) = S defcendendo nancifcimur: 



4 



(~> ~~ ' ( T ) ' ( T ) ^~ ' ( T ) = [Sffif ' 



/»- 8 x __ _^l_VEFG_ ,»-9n _ *0}£ EFGH „ 



4 <. XSC ' ^ 4 J = " <»M£C 



& horizontaliter piogrediendo : 



»-4v * ,^4n _ * . /£4j _ f<^ ,«2*\ _ K"^^ 



