.
, , .
Y(x) MX . , , . . , .
, , e(x) ( ) MX, x; , MX, . .
, , . , . , . () .
, . , .
, MX . .
Y(x) D : Dx = x - x0, x x0 . ( ) : [D] = YDs(x); s[D] = Ys(x), YDs Ys - x . . ( , ):
, Dx . Dx , ,
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YDs(x), . YDs(x) [YDs(x)] D[YDs(x)].
Dx , YD(x) Ys(x), , . . . Dx , . Dx YD(x) Ys(x) . Dx, Ys(x)max.
. Dx . Dx . , .
. : YDs(x) = , . [Dx] = [Dx]; D[YDs(x)] = 2 D[Dx], [Dx] D[Dx] Dx .
, (, , ..) . , x1, x2, x3,..., xL. Y(x1, x2, x3,..., xL), .
(. . 12.1) , . .
.