2 ALF GULDBERG. M.-N. Kl. 
J” 
Case 1. Let F=o0, G=o, E +0, and suppose A + 0, and our 
system becomes 
BON WEHR 
re tee 
JAVA _ 
me i) ar as 
The second equation gives either D— 0, or (5)= = 0, Or u 0. 
oy dr 
It is easy to see that neither of the last two assumptions can lead to 
a value of / satisfying the given partial differential equation (I). 
It remains then only to assume that D=0. Our system then becomes 
(5) (er) DEE 
ar) +(e) tere 
Multiplying the second equation by an indeterminate multiplier 4, and 
adding the result to the third equation, we obtain 
(aff + 24 (Å) La (LL + cam (0) 2 
UE IEEE 
