The core is a set which satisfies a system of weak linear inequalities, so it is closed and convex.
中心是一个满足弱线性不等式的合集，因此它是封闭的、凸的。
Based on geometry and convex set methods, this paper gives systemically the definitions of global and local convexity for planar closed parametric curve, and proves the two definitions are equivalent.
从几何和凸集的角度，系统地给出了平面闭参数曲线全局凸和局部凸定义，并且证明了这两个定义是等价的。
It is obtained that a necessary and sufficient condition for a closed fuzzy set to be a convex fuzzy set.
引入线性拓扑空间中的凸闭模糊集概念，得到闭模糊集是凸模糊集的充分必要条件。
The concept of closed fuzzy set is introduced in topological linear space. It is obtained that a necessary and sufficient condition for a closed fuzzy set to be a convex fuzzy set.
引入线性拓扑空间中的凸闭模糊集概念，得到闭模糊集是凸模糊集的充分必要条件。
First, we relax the uncertainty set to be intersection of a closed convex cone and the translation of an affine subspace.
首先我们放松了对不确定集的限制，把鲁棒线性最优化拓展到凸锥和子空间平移的交的不确定集的情形。
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；
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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