在歐幾里得空間中的集合 
是凸集，如果它包含連線其任意兩點的所有線段。如果集合不包含所有線段，則稱為凹。
可以使用 Wolfram 語言中的函式來測試區域的凸性Region`ConvexRegionQ[reg]。
凸
另請參閱
連通集，凸域，凸函式，凸包，凸最佳化理論，凸多邊形，凸多面體，凸集，Delaunay三角剖分，閔可夫斯基凸體定理，單連通使用 探索
參考文獻
Benson, R. V. Euclidean Geometry and Convexity. New York: McGraw-Hill, 1966.Busemann, H. Convex Surfaces. New York: Interscience, 1958.Croft, H. T.; Falconer, K. J.; and Guy, R. K. "Convexity." Ch. A in Unsolved Problems in Geometry. New York: Springer-Verlag, pp. 6-47, 1994.Eggleston, H. G. Problems in Euclidean Space: Applications of Convexity. New York: Pergamon Press, 1957.Gruber, P. M. "Seven Small Pearls from Convexity." Math. Intell. 5, 16-19, 1983.Gruber, P. M. "Aspects of Convexity and Its Applications." Expos. Math. 2, 47-83, 1984.Guggenheimer, H. Applicable Geometry--Global and Local Convexity. New York: Krieger, 1977.Kelly, P. J. and Weiss, M. L. Geometry and Convexity: A Study of Mathematical Methods. New York: Wiley, 1979.Webster, R. Convexity. Oxford, England: Oxford University Press, 1995.在 上引用
凸請引用為
Weisstein, Eric W. “凸。”來自 Web 資源。https://mathworld.tw/Convex.html