n)4 



R. FUJISAWA. 



E(|nation (90) may also be written in the form 



(91, ^Z^^/rfloH^V 



dii'- 



\ ai(. / dk da dk 



SI mi 



1^, ^ +(î?!i^.y+2,,,.l!2sLf „ '^ + 2;,./,- '^ = 



"^ du- \ du / dk du dk 



Siibtractirjo; the former eqna,ti(^n from the latter and I'enhieinii' ,. , 

 •^ ^ ' ■ n{u) 



Ijy ç^, we (xq\ 



(92) '^ + f'Ä + 2 S '^^- + Mr- '^ „ I ^^ + llir ''^ = 0. 

 du- \ da / ( du dk ) (/// 



dk 



N 



ow 



-%//• sn m 



ß,(n 



u) /k_ 

 A' y h' 



ä{nu) ' y k 



cnnu = 77= — r, VÄ- (In;/// = 



ä[m() 



0{nu) ' 



mnltiplying the nnmerators and denominators on the ri^lit-linnd side 



by 's:!^, 



VFsn }iu 





wliere 



V 



(98) 



/^(////)^"^-H0) 



/^i(;///)/^'''-\0) 



7.= 



t),{nu)6-'-\0) 

 ß,{uu)ß"'-\0) 



' ä"\u) ' ' •■ ~ fi"\u) 



Put //// instead of » in eqnation (91), tlms : — 



