幂等矩阵线性组合的可逆性

设T1,T2,T3是三个不同的两两相互可交换的n×n非零的三次幂等矩阵,并且c1,c2,c3是非零数.本文主要给出了线性组合c1T1 c2T2 c3T3可逆性的刻画.     

两个酉算子的线性组合与框架分解

In this paper, we prove that the norm closure of all linear combinations of two unitary operators is equal to the norm closure of all invertible operators in B(H). We apply the results to frame representations and give some simple and alternative proofs of the propositions in “P. G. Casazza, Every frame is a sum of three (but not two) orthonormal bases-and other frame representations, J. Fourier Anal. Appl., 4(6)(1998), 727-732.”     

迁移在数学分析教学中的应用

按照认知心理学的迁移理论,在数学分析教学中可以根据相关知识体系的特点促进知识学习的正迁移,同时采取合理的教学策略把负迁移的影响降至最低,从而达到提高教学效果的目的.