11 
v-plane 
plane of 
A: 2 
sn(v) 6 1+2 
Fig. 2. 
Case IVb. Point O lies inside the ellipse; 7, and 7, are real, 
R,, R,,S, and S, are imaginary. 
| | OG 
IVb. in 7; | on 717 | in 7 | on 727; a in 7; 
| 
== zE Es EMAS EE = zn | En = SS = mik 
| iK PR teal |) ARTE re ue Teak ARS 
PVEN BE SWI) EEK 
5 | TV2 pos. real | TV2 | pos. real BET ee 
a 0 neg. real | 0 ‚_pos. real | 0 
| | 
I 0 | pos. real | 0 | neg. real 0 
| | 
The points where the motion of / changes its sign are according 
; 3 ; N 1 
to what was found in /Va the points for which argu? thus 
sn (YP 
v= K-+7K’ (mod. 2K and 27K") (see fig. 3). 
