... 凸胞腔的棱 edge of convex cell 凸闭包 convex closed hull 凸闭集（合） convex closed set ...
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closed convex hull [数] 闭凸包
closed convex cones hull 闭凸锥包
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The paper is concerned with two aspects:A necessary and sufficient condition for convex hull of a set in E2 being closed;
本论文以凸体为研究对象，主要涉及两个方面的内容：平面凸集的凸包为闭集的充分必要条件；
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