研究了正则环上投射根的性质。

We study the properties of projective radicals of regular rings.

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通过分析相应特征方程根的性质，给出系统稳定的一个充分条件。

By studying the properties of roots for the corresponding characteristic equation, the sufficient conditions under which the equation is stable are given.

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它使用了对称矩阵特征根的包含原理和分隔定理，并利用了正矩阵特征根的性质。

By using the contain theory and partition theorem of symmetric matrix, three conjectures about YANG Hui matrix are cetified.

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