答案1
您可以使用bsmallmatrix
from mathtools
,但最好改变符号。空的上标会将下标向下推。
\documentclass{article}
\usepackage{mathtools}
\begin{document}
text $\tau^{}_{\begin{bsmallmatrix} 0 \\ 4 \end{bsmallmatrix}}$ text
\end{document}
较小版本:
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\newenvironment{btinymatrix}{\left[\vcenter\bgroup
\Let@\restore@math@cr\default@tag
\baselineskip4\ex@ \lineskip1\ex@ \lineskiplimit\lineskip
\ialign\bgroup\hfil$\m@th\scriptscriptstyle##$\hfil&&\thickspace\hfil
$\m@th\scriptscriptstyle##$\hfil\crcr
}{%
\crcr\egroup\egroup\right]%
}
\makeatother
\begin{document}
text $\tau^{}_{\begin{btinymatrix} 0 \\ 4 \end{btinymatrix}}$ text
\end{document}