... positive space 正空间 positive square root 正平方根 positive subdefinite matrix 次正定矩阵 ...
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The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
Square root method is one of direct methods, which is an effective method for the solution of symmetrical positive liner equations through triangle decomposition of symmetrical positive matrix.
直接法中的平方根法，就是利用对称正定矩阵的三角分解而得到的求解对称正定方程组的一种有效方法。
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