293 
d, ; 
As (5) — 0 is identical with the expression (2) or (2b) derived 
wat 
d? 
from it, <P) — 0 is identical aly —|1/,RTv — (« A+ =) |=°. 
dv’ t dv 
When we take (2) instead of (26), 
RTv N = (2—2) a? — 2 # (1—a) a A Ha (le?) (I—D') A? 
should be differentiated with respect to v(7’ constant); which yields, 
06 
when again, as in $11, (Ge) =A bd is put =0, so that 6 is only 
“yy 
a function of v: 
PRIN} Ni) = 20-0) ade ( 7) Qu (1—w) a'A 4-2 (21 aca 
After multiplication by v and substitution for '/, RTv of its value 
(26), we get: 
AB eet ENE 
(aa + =) (xn + & (l—r) (2 «—1) a | b BT (2—w) (L Hz) b ‚) = 
dx 
dv 
= 2a'v B—v (5 =) | «2-220 tye + (807-1 JL-H)A" [-a(L-st od 
{ 
For from N= 2-— (2—.) (1 4-2) 6’ follows N’ = —(2—.x)(1-++-2) 6" 4- 
di di >(1—2) A 
+ (2% — 1) 0’ (=). hence N’v becomes with (Z)= ae 
Vv 
which is written down above. Further (2—w) a—v (1—e) A has 
been replaced by B. 
dre d (v—b ey i — 
Kor a == |= va) we find — 
der dUN ev t v 
a ial = ava(S “). hence 
A ) | 
av=a (3 (1) teln Baa (1-0) («B-o(-0) Ad ) , 
so that we find: 
AB Uae 
(«a+ 5) (yv + & (1—2) (2 «—1) a b 5) = 
2 EE (Na A+AB) — #(1—a«) N | = 
