摘要: Let $f(x)=ax^2+bx+c$ and $|f(0)|,|f(-1)|,|f(1)|\leq 1$. Then show that (1) for any $x\in[-1,1]$, $|f(x)|\leq \frac{5}{4}$. (2) for any $x\in[-1,1]$, $ 阅读全文
posted @ 2021-10-31 16:42 Minimal_Cone 阅读(69) 评论(0) 推荐(0) 编辑