如何强制波浪符号向量中留出空格？

Question

按照问题如何使用波浪号

我想要之间有空格tilde。我试过\space但没有效果。

例如：

$\hat{\undertilde{\widetilde{x}}}$ $=$ $\sqrt{0^2, \space\widetilde{x_1}^2, \space\widetilde{x_2}, ..., 1}$

$\hat{\undertilde{\widetilde{x}}}$ $=$ $\sqrt{0^2,\space\widetilde{x_1}^2,\space\widetilde{x_2}^2, ..., 1}$

完整 MWE

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{accents}

\begin{document}

% $ \| \underaccent{\tilde}{\tilde{x}} \| $

% This is my $\|\undertilde{\widetilde{x}}\|$

$\hat{\undertilde{\widetilde{x}}}$ $=$ $\sqrt{0^2, \space\widetilde{x_1}^2, \space\widetilde{x_2}, ..., 1}$

$\hat{\undertilde{\widetilde{x}}}$ $=$ $\sqrt{0^2,\space\widetilde{x_1}^2,\space\widetilde{x_2}^2, ..., 1}$


\end{document}

Answer 1

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{accents}

\begin{document}

    % $ \| \underaccent{\tilde}{\tilde{x}} \| $

    % This is my $\|\undertilde{\widetilde{x}}\|$

    $\hat{\undertilde{\widetilde{x}}}$ $=$ $\sqrt{0^2, \,\widetilde{x_1}^2, \,\widetilde{x_2}, \cdots, 1}$

    $\hat{\undertilde{\widetilde{x}}}$ $=$ $\sqrt{0^2,\,\widetilde{x_1}^2,\,\widetilde{x_2}^2, \cdots, 1}$


\end{document}