Let \(x\in \mathbb{R}^n\) and \(\alpha\in \mathbb{N}^n\) a multi-index. Then
\begin{equation*} |x^\alpha|\le \lVert x\rVert_2^{|\alpha|}. \end{equation*}Let \(x\in \mathbb{R}^n\) and \(\alpha\in \mathbb{N}^n\) a multi-index. Then
\begin{equation*} |x^\alpha|\le \lVert x\rVert_2^{|\alpha|}. \end{equation*}