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When writing diagrams with XY-Pic, fractions appear as if they were math enclosed in $$.
Example:
\documentclass{minimal}
\usepackage{xy}
\begin{document}
\begin{xy}
(0,0)*{\frac{d_1}{d_2}};
\end{xy}
\end{document}
The actual diagram I am working at is of course more complicated, and these fractions appear too cramped.
How can I enforce the fraction to appear as in displayed math, that is, as in \[ \frac{d_1}{d_2} \]?
You should use \dfrac instead of \frac. This macro is available using the package \usepackage{amsmath}.
There is as well a macro \tfrac available.
The letter d stays for \displaystyle, and t for \textstyle.
