In Chapter 2,by using space decomposition and block operator matrices,the relations between the angle of two closed subspaces and norms,spectra,the reduced minimal numerical ranges,ranges closedness of operators are researched.
第二章运用空间分解理论,分块算子矩阵技巧研究了两个子空间之间的夹角与算子的范数、谱、约化极小模以及算子乘积的值域闭性的关系等。
参考来源 - 初等算子与子空间夹角以及效应代数相关研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A sufficient condition is obtained for a class of second order operator matrices to generate C0 semigroups.
给出了一类二阶算子矩阵生成C0半群的一个充分条件，并应用此条件证明了一类具体的二阶算子矩阵可生成C0半群。
The full transformation method deals with each boundary constraint node, and for stiff matrices and displacement vector, using operator transformation, relative operator calculation is performed.
全变换方法用于处理每一边界约束点，对刚度矩阵和位移矢量作相应的算子运算。
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