( 656 ) 
RU? in 6?(1— 2.x) —2a(1—«a)@ap—2a(v—b) B+ 2ay/a(v—b)? 
df 3 
EAD: = = 2a(1—.w)Ga + 2a(v—b) RAE 
v 5 
r . iQ Py 2 . € 6 nT / Br 
where 9 is written for a + a(v—b), and p for */, vf. 
The equation (7a) becomes consequently : 
er 
2aVa (p-b) ) Sp 
e ai {|e c- 2x) + 2ay La (v- (or | = us 
RT ot Sv 
ade | z_ Zea (v- a 24), DIT 
2 la (1—« a (wb = a =U), 
+ 2 ja (1-a) Ga + a(v-6))) | ee RI 
The expression between { | is obviously : 
2V a), ea) 2Va/,, CEs, 
— = (av—BYa) — 
RT RT + 
29 
as av —BYa=a2+a(v—b)=6. Further we have R7=-—, in 
EM 
consequence of (6), so that we obtain: 
a(v—by? 
ae 
1 v(vu—b)? ) 3 
| 6? (1—2z) + 2a a (v —b) | = je SE ~ ! | 2 = 
26 as a Ë (Le) Ga Ha cf = ou 
And since p — a (v—b)? = a (1—a) 6’, we have, after multiplication 
with go: 
ale ; a(1—-a:)4? + a(v-b)? 
a(1-x)6?| 6?(1-2.) 4+ 2aY a(v-b)* |—3—— -— 
=== agaat 
v 
— 26 Wa (v-b)? za Oa Ha | = 
In this expression the underlined terms vanish. And for 
By —aYa.v(v —b)? may be written: 
Ba (le) 6? — Va (v—b)? (av—B Va) = Ba ( (le) 6? — Ya(v—by? 6 
so that we obtain, after dividing by 6, and multiplying by v: 
z (1-2) 6 |e v — 3e (1-2) el + Wa (vb) |- 2av(v-b) + 32a (1-7) 6? — 
rani 3 va Ba (1-2) 6 a 3a | = 0, 
or finally: 
