函数在一点的可导性与在该点附近的导数的关系

本文通过研究函数在一点的可导性与函数在该点附近的导数的关系,得出了函数在一点可导的一个充要条件,并通过举例说明了它在研究分段函数在其分段点的可导性方面的运用。     

Differentiability of the Pritchard-Salamon systems with admissible state-feedback

INTRODUCTION The Pritchard-Salamon class of infinite dimen-sional systems was first introduced by Pritchard andSalamon (1985; 1987) to provide a general abstractframework for linear quadratic control problems.Now, many papers on a wide range of control prob-lems for Pritchard-Salamon systems have appearedand many of its important mathematical and systemtheoretical properties have been revealed. We give thefollowing definition.Definition 1 Let W, V, U, Y be Hilbert sp…     

重积分的分部积分法

应用定积分的分部积分法，含参变量积分的可微性及含参变量累次积分的可微性给出了重积分的分部积分法。