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。
Usually, multivariate spline function is smooth on every point of net lines.
主要结果是：当高次项是奇数次齐次多项式时，周期函数是单调增加的；
The main results are. the period function is increasing when the higher degree is odd;
主要结果是：当高次项是奇数次齐次多项式时，周期函数是单调增加的；
The main results are. the period function is increasing when the higher degree is odd;
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