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The necessary and sufficient conditions of similarity of two idempotent matrices are proved, the idempotency of linear combinations of two idempotent matrices is discussed.

摘要证明了数域上两个同阶幂等阵相似充要条件有相同秩；给出了幂等阵相似标准型；讨论了两个幂等阵线性组幂等阵充要条件。

The concepts of indecomposable matrices and fully indecomposable matrices over a distributive lattice L are introduced, and some algebraic properties of them are obtained.

引入了分配格上不可分矩阵与完全不可分矩阵概念,并获得了一些代数性质.

One kind of inverse eigenvalue problems, whose solutions are required to be normal or diagonalizable matrices, is investigated in quaternionic quantum mechanics.

摘要本文研究了四元数量子力学中一类要求其正规或可对角化四元数矩阵特征值反问题。

The tripeptide Arginyl-Glycyl-Aspartic acid (RGD) is a common cell recognition site of many adhesive proteins contained in extracellular matrices and in the blood .

RGD三肽（精氨酰-甘氨酰-天冬氨酸）序列细胞外基质及血液中许多粘附蛋白共有细胞识别位点。

In the practical applications of highly nonnormal matrices, these theorems may be more useful than their generalized eigenvalue special cases and may provide more descriptive information.

在对高度非正规矩阵研究应用中，这些定理将比特例-广义特征值定理更可靠，能提供更多信息。