The direct sum decomposition of the addition of a linear transformation under the coprime polynomial was given, and it was used in the proof of some equality about the rank of idempotent matrix.
给出了两两互素多项式下线性变换的核的直和分解，并应用于幂等矩阵（对合矩阵）的秩的等式证明中。
2
This method uses one-rank higher polynomial interpolation for displacement than that for pore water pressure, but the rank of radial basis for them is the same.