xoa t>E MKTUODO 



Xlll. 



Gini igitiir Iiic rnigiilis valoribiis ipHiis y varin- 

 tioncs infiiiitc paruas tribiiainus , diipiiccni (latum f()r- 

 mulacyZ<s^.v confidcramus , in quonim altcro rniguli 

 \al()rcs i])(iui) y fint ii ipfi , (|UOS (juaclita rciatio inter 

 X ct y rc(]uirit , in altcro autcm iidcm valorcs variati 

 contincantur \ priorcm ftatinr. didiiKftioni^ caiila pnmi- 

 palcm , altcniiii vcro jlatuin vririatum appcllabo. Na- 

 tiira crgo maxiiiKjnim ct niinimorum i^odiilat , vt dif- 

 fcicntia intcr hos diios rtatus cuancfcat. QiiciDadmo- 

 diim igitur in flatu principali valor ipfius y (luicunquc , 

 dum variabilis .v difTcrcntiali dx crcfccrc (iimitur , in- 

 crcmcntum d y ca]-»crc ccnlctiir , ita mancntc Xy dum 

 a (tatu principali ad ftatiim variatum progicdimur, va- 

 lorcin ip(ius y ticmcnto oy augcri (latuamus • vnde 

 didrimcn intcr has duas cxprcdioncs difTcrcntialcs dy 

 ct h y ])robc notctiir. Duin autcm ringuiis vaioribus 

 ij:>ruis j, trnnfitu ad (tatiim variatum f:i(flo , huiusmodi 

 incnnicnta o y iribuimus , ca taiKiiiam pianc indctcr- 

 niiiiaia, nc(]iic vilo niodo ab ipfis valoribus ipfius y ])cn- 

 dciiiia , fijiu (pc(5tanda. 



XIV. 



Ilis pofitis indagari ilcbct , (piantum incrcmcn- 

 tiiin (]iiaccun()uc fiin(flio Z ])r() (juoiibct vaiorc ipfins .v, 

 diim a datu principali ad variatiim transfcrtur , capiat; 

 (]nod incrcmcntum a (()ia variationc ipfius y , (]uatciius 

 liac naiisiationc cicmcnto hy augciiir , j-rolicilcitur. 

 Indicciiiiis hoc incrdncnium pcr f3 Z, ita vt vaior 

 ipfiiis Z a (laiii principaii ad variatum tian&iatus fit 

 izrZ^-iZj ac ])rinio (latim patct, fi fiuKflio Z a (ola 



variabili 



