A point of the form θ1x1+ · · · + θkxkwith θ1, . . . , θk≥ 0 is called a conic 4 `2 o$ y' L1 j) N& l& N4 X$ zcombination (or a nonnegative linear combination) of x1, . . . , xk. If xiare in a& X7 g6 v1 W7 N5 D/ u（欢迎访问avcar：https://avcar.vip）
convex cone C, then every conic combination of xiis in C. Conversely, a set C is + S7 A, N1 _) `a convex cone if and only if it contains all conic combinations of its elements. Like B- Z) K( [4 }& U) vconvex (or affine) combinations, the idea of conic combination can be generalized+ U- r# `* q+ ?- ^& } m（欢迎访问avcar：https://avcar.vip）
to infinite sums and integrals.
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发表于 2020-4-13 16:00:32
