F V N C T ! O N V M. rp 



rabilium x et j, calcuhis diflfereiitialis regulas prae- 

 fcribit , (luibiis valores omnium iftarum tormularum 

 difTrentialium inueniri queant : primo lcilicet primi 

 gradus , quae Cunt {£%) ct (j;^) , tum fecundi gra- 



dus , quae funt (j^r) , (drrTj.) ^t (^) , porro tcr- 

 tii gradus , quac liint 



€t fic dcinccps. Vbi qiiidcm. notandum, ipfam metho- 

 dum, has formulas definicndi, a prima partc non di- 

 fcrcparc , cum in qualibct diffcrcntiationc vn ca tan- 

 tum quantitas pro \ar:abili habcatur. Supcrtluum 

 Ibret , hacc cadem momcnta de fun(fl'onibus tr um 

 phiriumuc "variabihum cxponcrc , qnipp^ quae ex 

 allatis iam fatis funt pc.rrpicua. 



17. Intcgrahs antcm calciili miinus in hoc 

 confiftit, \t propolita rchitione quiicunquc intcr quan- 

 titatcs a:, y, z ct formulas difFtrcntialcs modo alla- 

 tas , indc natura funjflion s z, qucmadmothim cx \a- 

 riabihbus x ci j conflatur , inucfhgctur. Rclat'0 

 \cro illa data pcr acquationcm cxpr mitur , qiiac fi 

 tantum formulas diflcrcntialcs primi ordm s (^^) ct < ^ -?;) 

 practcr quantitatcs ipliis x , j , ct z complcdli- 

 tur , acquatio diffcrcntialis primi gradus \ocatur ^ 

 fin autcm in cam iniiipcr formulac diffcrcntia- 



les fccundi ordinis (1^^), (^4^ ), ('^7') , ^cl porro 

 tertii akiorumuc ordinum ingrcdiantur , tum accjua- 

 tio illa ciusdem ordinis difRrentiahs dicitur. Haccque 

 cft forma gcncrahs calcuh intcgrahs , quatcnus circa 



C a fundio- 



