. . . - 6)-. . .: .: f:y=f(P) . . . 0 . . ., . - U ( r ) + () . . - df(P*)=gradf,( f(P0)=nk=1 Akxk+(P) xk=xk-xk0 = = ngradU PP ) grad . . (S ) a y1 ( x ) n * n