它的局部是凸的，因为它没有环路，且曲率永远不会改变符号。
It is locally convex in the sense that it has no loops and the curvature never changes sign.
分析了挤压翻边与传统翻边应力状态的不同之处，以及翻边凸模的冲头曲率半径对翻边效果的影响。
The differences of stress state between extrusion-flanging and traditional flanging, and the influences of curvature radius of burring punch on flange height were analyzed.
本文研究常曲率平面上的凸集，研究常曲平面上的凸集方法。
In this paper we investigate the convex set in a plane of constant curvature.
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