514 DOMENICO PlANI 



Cio posto , sara 



:" ' '=:i(;-t-/i)(z-t-2^0 (r-t-« — m — l//)(z-f-n — mh){z-\-n — m-i-1 //) 



....(z^n—Mi) 



z=z{z^i){z-ir-1h) (Z-4-7J — m — 1 li)x(z-^n — m/()(z-+-n— wi-<-1 //).... 



....{z-hji — lh) 

 = r. ' {z-hn — mil) ; 



qiiindi 



n — m 1 li " 



m I h 



( Z -t- « mil) 



Questo suppone m<n-, ma estendendo ad in=n 



■(z-^/O""' 

 Lo stesso si avrebbe lasciando n indeterminata , poiche 



n I h 



z(zH-^)(z-f-2/0....(z-+-nZl h) 



{z—{ih){z—n—1 h)....{z~U){z-.h)z{z^h){z-\-2h)....iz^n-.'[ h) 

 1 1 



{z—t'h){z—^h) {z—2h)(z—h) ~ (s— ^Af ' ^ 



