1317-86.
,
n - , .
,
, , . ( ), , , .
, , , [1, .23]. , , i, , Xj, , .
. x z :
cov (x,z) = cov (z, x) = (13)
cov (x,z) s(xi, zi), n xi zi x z:
s(xi, zi) = (14)
s( , ) = (15)
uc2(y), , :
sc2(y) = , (16)
xi; xj Xi; Xj,
u(xi,xj) xi xj.
xi xj :
r(xi; xj) = , (17)
r(xi; xj) = r(xj; xi) -1 ≤ r(xi; xj) ≤ +1
(21) :
s c2(y) = (18)
, i Xk , :
) i Xj , , , , () , ;
) i Xj ;
) i Xj.
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