convex set的用法和樣例：
例句
- Convex sets and functions have many interesting and useful properties which are not explored in detail here.
凸集和凸函數具有很多重要的和有用的性質(zhì)，在此不作詳細討論。 - Duality is emphasized throughout,particularly in the form of Fenchel's conjugacy correspondence for convex functions.
這本書(shū)的目的是為了提供各類(lèi)凸集和凸函數理論的介紹，它們在極值問(wèn)題的應用中發(fā)揮核心作用。
