Amstex sample rsfs

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Using the "rsfs" Fonts in AmSTeX

Ralph Smith's Formal Script is a script font that is more elaborate than the "calligraphic" font obtained by \Cal. Like \Cal, though, it includes capital letters only.

\documentstyle{amsppt}

% the following implements the rsfs fonts
\font\tenscr=rsfs10
\font\sevenscr=rsfs7
\font\fivescr=rsfs5
\skewchar\tenscr='177 \skewchar\sevenscr='177 \skewchar\fivescr='177
\newfam\scrfam \textfont\scrfam=\tenscr \scriptfont\scrfam=\sevenscr
\scriptscriptfont\scrfam=\fivescr
\define\scr#1{{\fam\scrfam#1}}

\document
Let $\scr F$ be a sheaf.  Call it $\scr G$.
\enddocument

(Note that this is not to be taken as an example of good mathematical exposition.)