本文的主要结果是证明有限到一的连续闭映射保持具有点可数型的空间。

In this paper it is shown that Spaces of pointwise countable type are preserved by fi-nite-to - one, continuous, closed mappings.

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本文给出了集值映射的上半连续性和下半连续性同图象的闭性和开性间的一些关系。

This paper gives some relation of U. S. C. and L. S. C. of set-valued mappings with closed and open property of image.

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首先，我们建立了集值映射二阶相依导数和二阶邻接导数的连续性和闭性。

Firstly, we establish continuity and closedness of second-order contingent derivatives and second-order adjacent derivatives for set-valued maps.

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