Toeplitz矩阵和循环矩阵
https://www.jianshu.com/p/2943bb916f7d
https://blog.csdn.net/weixin_41923961/article/details/83721689
Fast Matrix Multiplication by FFT
https://math.mit.edu/icg/resources/teaching/18.085-spring2015/toeplitz.pdf
https://zhuanlan.zhihu.com/p/27919464
矩阵的谱分解
https://zhuanlan.zhihu.com/p/31106828
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