g ~. (m [m — ») (m — i) (m — ^lf-" — i)\* 



>. 5. 3. 4. 5 



_^ 7f (m — .)M". — r ) ' r^ - ;)« fTr, — t) /^ ^_ g^\ MJqnj 



1. 2 



-i- W^ (w - 4) (a -\- ^') -\- l -{- k' 



^ «m-.)(^-^.).(^-.) P(^p;_^/p^ 



^_ a e' - a' + C!!^)^-^^' (;« _ 3)(|3' ^ - |3 7') 



-f- (m - i) (w - 3) (p' e - (3 e') 4- (3',>, - p tj' 



-I- (m- 2y (y 5' - -y' ^) 4- V ^' - y < + 3' e - r 5'. 



Vbi quidem facile patet, quo tenore reliqui coefficientes 

 proccdere debeant. 



§. p. Hac igitur ratione, fi binae proponantur for- 

 mulae difFerentiales formae iftius commemoratae, genera- 

 tim quidem afHgnare licet formulam differentialem , quae 

 nnn nifi diiferentialia vnius variabilis inuoluat; at fi tres 

 propofitae fuerint huiubmodi formulae differentiaies , tum 

 disquifitio ifta inulto operofior et perplexior enadet, id 

 quod exemplo quodam illudraie placet. Sint igitur pro- 

 pofitae ifiac tres aequationes difFerentiales: 



I. .v' ddj -^ axay + ^^xdz-^-yxdv-i- 6j-\-'Z~\-^v:zo; 



II. x" d(iz-{-a.'x dy-^(^' X £lz-{-y'xdv -\ d'j-i c'z+l.'v — oj 



III. x'dd'v-hot."xdj-i-^"xdz-{-y"xd'u-\-^''j-]-e"z-i-^"v-o', 



ex quibus aequationem elicere oportet differentialem , fola 

 differentialia vnius liarum variabilium , vtpOte y, inuol- 

 Yens. Modo igiiur fupra praefcripto differentientur ha- 



I 2 lum 



