50 PROFESSOR KELLAND ON A PROCESS 
equation, which are reduced to ordinary differentiation or integration in other 
cases. The other forms are as follow: 


: D 
2. By making ue (as 1) =o (-3) 
LD 
D Sige. 
or oi (- x) a 
! 
ee | 
2 -@n-29/ 2 gen—a0 

—(n— 1d Ga Qn— . 
and, consequently, «=(—2)~~” C = ) 2’"~?; where v is found from the 

Dee y= ( ( ae a 
equation of the first order » Dice wer i= z)) 0. 
This solution is of the ordinary form, whenever 7 is a positive or negative 
integer. 
D 

: D D 
By making Peau =p57=2->/(-2) 
|-3 
D Y 
ae lun Bt 
5 —n+1+ 5 
AD 
—>5zt+n-1-5 
_p-@n—2-p) | 2 2 2n-2-p 
ne = 1d Na Pe 
and u=(—2) @—5 ves)" 5 es p 2», 
where v is found from the solution of the equation of the first order, 
D+2n—2 26 _ D\ -1 
[ee »=/(-3) . 0. 
This solution is of the ordinary form when -§ is an integer. 
, D D D 
4. By making t(-2 += pees (- = 

Dp 
D oe 
or r(- )= EEE 
. [Da 
Hoa 2 
D —_ 
—=—+n—p—1 
ge P e(2n—p-2)4 

