[([(d(P
1
,P
2
))/(d(P
1
, P
3
))]=d(P
¢
1
,P
¢
2
))/(d(P
¢
1
, P
¢
3
))]
File translated from T
E
X by
T
T
H
, version 3.01.
On 12 Aug 2002, 16:18.