"**$ ) 7+ ( S*> 



ddx 



+ jji$ 

 4-jx'5' 

 +jx"5" 

 -f- v a 

 4-v'a' 



-f- ""-" 



+ ? 



+;|4 £ 

 + *V 

 +J*V 



4-v(3 



+v'a; 



+ M 



+ ^'<? 



+/# 



+ v y 

 + Wy/ 



+ y^ 

 + v># 



</ jr </j' 

 +- 1$ + v e 



+v'o' +y«< 



+ ^« -fVe" 

 + f « l + ? f- 



+ e'*'l + e'P 



+ ^ i +> V i +<"*" 1 + ?'f ( +/V 

 + ?' I+?" i 



+?5 



+e'5' 



+*•"# +^"o" 



+?v 

 + ?V 



+ e e + f £ 

 + ?'£' +?'4' 



+eV +*"£' 



Vbi fi coeflicientes diffcrcntialium ipfiusyets nihilo acquales 

 ftatuantur, fequentes prodibunt aequationes: 



P+-X' — o ; £ -f-X(3 -f-X',3'-f-X" (3"H-jjl'= o 



y-f-A"_:o, /'-}-Xy-f-X'y'-f-X" 



Y 



X g -f- X' e' -i- X" e" -4- jji j3 -+■ ;*' (3' -f- jjl" (3" -f- y' == o- 



X^_ l _x'^_j-X''^"_4-f J .y-|-fx'y-r-^"v"^-»'" = 

 jxe-f-jx y £'+-[x" £ "-f-vl3-f-v'|3'-+y"p"-f-?'=o 



^^^^^^^-H^y-f-^V-f-v^y-f-f-o 

 ye _ f -/e'_HvV-^ ? p+-?'p , -+-f''f>'- 



o / v/ " v'/* ' ' i // '/ 



v4-4-v4-f-y <; +-?Y+~? r ■+"? V ^ 



££-+? £ +-f £ — O 



e*+-eT-+g'T=°- 



Quae fi reclc tra&entur, hos dabunt valores : 

 X=(3' + Y"i X'_-p; X"_-Y 



y-y''e<-ye" + f3'£'-[3''£'; 

 v /- ye //_y/ e + p//^_p^/. 



y"-y'e -Y £'+p^'-P'^ 



e _£'<"-e"^'; e=*z~,Pi f=*?-*l 



§. 14.. lam igitur fi aequatio noflra fola diffcrentialia 

 ipfius x continens, fupponatur effe : 



d x 



