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https://wangyinanchina.github.io/blog/2014/10/04/cvx-chap2/

The Elements of Statistical Learning µÄ±Ê¼Ç
https://book.douban.com/annotation/27912170/
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A cone K ⊆ R^n is proper (Õý³£×¶) if
¨C K is convex (͹׶ K)
¨C K is closed (±Õ£¬¼´°üº¬±ß½ç)
¨C K is solid; i.e., int K <> ∅ (ʵ£¬¼´ÄÚ²¿·Ç¿Õ)
¨C K is pointed; i.e., x ¡Ê K, −x ¡Ê K ⇒ x = 0  (¼â£¬¼´²»°üº¬Ö±Ïß)

COM524500 Optimization for Communications
Summary: Convex Sets and Convex Functions
http://oz.nthu.edu.tw/~d935608/files/summary1.pdf

the monotone nonnegative cone Km+
Show that Km+ is a proper cone
https://classes.soe.ucsc.edu/cmp ... ns/Solution2.33.pdf
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