重音数学字符上的下标和上标

Question

\documentclass{article}

\begin{document}

${x_i}^j$ works as expected but not with an hat as in ${\hat{x}_i}^j$.
The way I found to make it work is $\mbox{$\hat{x}_i$}^j$.  Is there
an nicer solution?


\end{document}

Answer 1

如果您希望帽子位于“x”和“j”的中心，且距离不太近，最简单的代码就是 \hat{x}_i{}^{j}。这样，符号的高度就不会被考虑在内，因此不是完全相同的结果，但{{}\hat{x}_i}^{j}会获得完全相同的结果。一些比较：

\documentclass[a5paper,12pt,twocolumn]{article}
\begin{document}
$\widehat{x_i}^j$ \dotfill{\tiny   \verb|$\widehat{x_i}^j$|}\par
$\hat{x}_i{}^{j}$ \dotfill{\tiny    \verb|$\hat{x}_i{}^{j}$|}\par 
${{}\hat{x}_i}^{j}$ \dotfill{\tiny    \verb|${{}\hat{x}_i}^{j}$|}\par 
${\strut\hat{x}_i}^{j}$ \dotfill{\tiny    \verb|$\strut\hat{x}_i{}^{j}$|}\par 
$\mbox{$\hat{x}_i$}^j$  \dotfill{\tiny  \verb|$\mbox{$\hat{x}_i$}^j$|}\par
$\hat{x_i}^j$ \dotfill{\tiny   \verb|$\hat{x_i}^j$|}\par     
${\hat{x}_i}^j$ \dotfill{\tiny   \verb|${\hat{x}_i}^j$|}\par
\end{document}