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。
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.
对理论变异函数球状模型及其套合结构拟合这一问题作了探讨，提出了加权线性规划拟合法。
The regression of spherical model and its nugget structure of theoretic variogram is discussed and the weighted linear programming method is proposed in this paper.
这类三角形系统的反馈线性化的充分必要条件要比反馈线性化理论的对合条件易于检验。
The necessary and sufficient conditions for feedback linearization of this triangular system are more easily testified than the involutivity conditions for the feedback linearization theory.
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