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C((0,1))上定义一个范数

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hbghlyj posted 2023-10-13 22:57 |Read mode
Last edited by hbghlyj 2023-11-6 10:45$C((0,1))$上$L^p(1\le p\le\infty)$均不是范数,因为可取到$\infty$.
问题:$C((0,1))$上是否能定义一个范数?

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Czhang271828 posted 2023-10-14 17:49
Last edited by Czhang271828 2024-2-6 13:13对任意数域 $\mathbb F$ 上的线性空间 $V$, 取 $V$ 的一组基 $S=\{s_\lambda\}_{\lambda\in \Lambda}$, 定义范数
$$
\|c_1s_{\lambda_1}+\cdots +c_ns_{\lambda_n}\|:=(c_1^p+\cdots + c_n^p)^{1/p}.
$$
此时 $V$ 是 $\mathbb F$ 上的一个 $L^p$ 空间.

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