这里主要也是根据第二部分的思想，将块循环矩阵对角化，从而简化了我们的运算。
The calculations are simple to given the diagonalization of circulate matrix according the second part in the paper.
证明了有限元求解的刚度矩阵是一个块对角阵，且其子矩阵是某种对称、块循环矩阵。
It is proved that the stiffness matrix of the finite element solution is a block diagonal matrix and its elements are some symmetric and block circulant submatrices.
分析正交块循环矩阵特性后，介绍了基于类单位矩阵的系统化构造正交块循环矩阵的方法。
The new method of making up Orthogonal Block Circulant Matrix systematically by Paraunitary Matrix is also presented.
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