什么是Convex set

本文介绍了欧几里得空间中凸集的基本定义:如果一个对象内的任意两点间的直线段上的所有点也都在该对象内,则该对象为凸集。例如立方体是凸的,而有凹陷或空洞的形状如新月形则不是凸的。

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In Euclidean space, an object is convex if for every pair of points within the object, every point on the straight line segment that joins them is also within the object. For example, a solid cube is convex, but anything that is hollow or has a dent in it, for example, a crescent shape, is not convex.

Illustration of a convex set, which looks somewhat like a disk: A (green) convex set contains the (black) line-segment joining the points x and y. The entire line segment lies in the interior of the convex set                       Illustration of a non-convex set, which looks somewhat like a boomerang or wedge. A (green) non-convex convex set contains the (black) line-segment joining the points x and y. Part of the line segment lies outside of the (green) non-convex set.



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