本文研究带有齐性核的奇异积分算子与BMO函数的交换子。

The commutator generated by BMO functions and singular integral operators with homogeneous kernel is studied.

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文章研究一般性齐次生产函数条件下长期成本函数的确定方法，证明了长期成本函数是关于产量的幂函数，并指出了长期边际成本函数和长期平均成本函数之间的特殊关系。

We prove that the long run cost function is a power function of output, and point out the special relationship between long run marginal cost function and long run average cost function.

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对于一般的非凸函数，其方向导数不具备任何凸性，可以利用一般正齐次函数的回收函数来给出它的一个上凸近似。

We research on describing preinvexity of functions in this paper by means of the density and weakly near convexity in the set.

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对于一般的非凸函数，其方向导数不具备任何凸性，可以利用一般正齐次函数的回收函数来给出它的一个上凸近似。

We research on describing preinvexity of functions in this paper by means of the density and weakly near convexity in the set.

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