Usually, multivariate spline function is smooth on every point of net lines.
通常的多元样条函数要求在网线的每一点上，分片多项式的光滑性一致。
New results are: present new expression for the basic function of many knot spline interpolation;
主要的新结果是：对多结点样条基本函数的构造给出了新的表述；
New results are: present new expression for the basic function of many knot spline interpolation;
主要的新结果是：对多结点样条基本函数的构造给出了新的表述；
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