When writing diagrams with XY-Pic, fractions appear as if they were math enclosed in $$. Example:


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.

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