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Another method to use The ''plain tex'' way of using the font is:
→Using Ralph Smith Formal Font: Added the ConTeXt way of using the font
Ralph Smith's Formal Font [http://www.ctan.org/tex-archive/fonts/rsfs/] provides a bit more cursive caligarphic symbols. They can be used inside ConTeX by
<context source="yes">
\starttypescript [math] [modern,computer-modern,latin-modern,ams] [size]
\definebodyfont [17.3pt,14.4pt,12pt,11pt,10pt,9pt][mm][mc=rsfs10 sa 1]
\definebodyfont [8pt,7pt] [mm] [mc=rsfs7 sa 1]
\definebodyfont [6pt,5pt,4pt] [mm] [mc=rsfs5 sa 1]
\stoptypescript
\definefamilysynonym [default] [scriptfamily] [mc]
\def\scr{\fam\purefamily{scriptfamily}}
\definetypeface [modern] [mm] [math] [modern] [ams] [encoding=texnansi]
\setupbodyfont[reset,modern,11pt]
\starttext
${\scr ABCDEFGHIJKLMNOPQRSTUVWXYZ}$
$\sum_{\scr ABCDEFGHIJKLMNOPQRSTUVWXYZ}$
\stoptext
</context>
I less precise method of using them is
<context source="yes">
\mathrsfs{ABCDEFGHIJKLMNOPQRSTUVWXYZ}
</context>
which does not use the correct font size. rsfs10 is used for bodyfont, scriptsize and scriptscriptsize.
'''Note:''' Since this is an italic script, one needs italic correction <code>\/</code> in the definition.
<texcode>
\font\tenscr =rsfs10 at 12pt %bodyfontsize \font\sevenscr=rsfs7 at 9pt %scriptfontsize \font\fivescr =rsfs5 at 7pt %scriptscriptfontsize \skewchar\tenscr ='177 \skewchar\sevenscr='177 \skewchar\fivescr ='177 \newfam\scrfam \textfont\scrfam =\tenscr \scriptfont\scrfam =\sevenscr \scriptscriptfont\scrfam=\fivescr \def\scr{\fam\scrfam}
</texcode>
