基于高斯消去法和A的LU分解之间的密切关系,讨论用高斯消去法的约化过程对正定矩阵A实现唯一的cholesky分解,具体给出一个构造性的直接计算分解的证明过程,以及将分解运用到求证正定矩阵某个特征的证明方法.%There are 15 species toxic seed plants belonging to 15 genera of 13 families on Dantuozi Island. These species are 28.3 % of all existing seed plants in the area, and there is only 1 kind of species belonging to shrubs, 3 kinds of vines, 11 kinds of herbs. 10 species pertain to toxic plants; the other 5 are little toxic plants. This paper analyzes the varieties of toxic seed plants and reasons for the formation of this distribution pattern.
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