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正定矩阵是一类重要的矩阵,正定矩阵的判定又是正定矩阵讨论的重要内容,文中给出了五种判断实对称矩阵正定的方法.“,”The positive definite matrix is very important in the matrix theory.And the decision on the positive definite matrix is an important content of positive definite matrix theory.Five methods about the decision on the positive definite matrix are introduced in this paper.