不变化

In this doctorial dissertation,we study the stabilization,strong stabilization and estimation problem in the framework of nest algebras in Hilbert space.

本文我们是在套代数框架下，研究Hilbert空间中线性系统的稳定化、强稳定化以及一般估计问题。

There is no sense in arguing with him.

和他争论没有意义。