FORMVL. DIFFERENTIALIVM. 139 



Porro Tero erit 

 V — p-4-ypH- TT^-I-Kr.. . + rtf atque 



-^vdp-^-i^dp-^-Kdr . ., , -\-rdu 



Tnde "vt fiipra feqnentes eliciuntur valores ipfarum 

 M , N , P etc. 



N^(^^) + ;^(^-f)+^(^-f)4-<-|)...4-«(iJ) 

 P:^(^^)+/^(,^) + ^(^-f)4-r(^-f)... + .(,^)+V 



8. Vt vero iam liqueat, vtrum formula Ydx 

 fit integrabilis nec ne? difpiciendum eft, an fequentibus 

 conditionibus ad eius intcgrabilitatem neceflariis fatis- 

 fiat : 



/d » >_ /d ir\ . /d V \_/d >t N /d v n /d t \ 



/d irN _ /d H \ . /d TT , ^ /d T \ -^^ 



Hunc in finem obferuetur efle 



(^=/ 



