1. 设 U(t)! 0 是区间 [a,b] 上 的连续函数 , 在线性空间 C [a,b] 上定义二元函数: ( f , g ) (s) f (s)g (s)ds , f , g C [a , b] b a U ³ U 证明: (C [a,b], ( , ) U) 是 ...
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7 Best and Worst Sugar Substitutes A sugar substitute can help keep you in your skinny jeans, but it may be harming your health. Here's the scoop on the best -- and ...
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