• 1. closed hull: 闭包
• 2. convex closed hull: 凸闭包
• 3. closed convex hull: 闭凸包

更多释义

• 1.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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