No.1 正定二次型和正定矩阵
No.2 矩阵的特征值、特征向量、特征矩阵、迹、特征值分解
No.3 矩阵和向量常用的范数
No.4 矩阵向量求导
No.5 行列式求导
（2）https://www.ics.uci.edu/~welling/teaching/KernelsICS273B/MatrixCookBook.pdf
（3）必看 Derivatives of determinants and trace with respect a scalar parameter - Mathematics Stack Exchange
（4）Proof for the derivative of the determinant of a matrix - MathOverflow
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