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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: Reducing fontsize for some equations
  (\startformula), how done best
Date: Tue, 13 Jan 2004 13:58:12 +0100
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Hi Tobias,

>I have several equations. But for some of them (lengthy and
>uninteresting calculations) in the appendix the default fontsize is too
>big. What is the best way (command) to reduce their size consistently?

Can you play with the following and let me know it this works ok with 
regards to spacing:

\starttext

\unprotect

\appendtoks
   \doifdefined{\??fm\currentformula\c!korps}
     {\switchtobodyfont[\getvalue{\??fm\currentformula\c!korps}]}%
\to \everydisplay

\protect

\definieerformule[small][bodyfont=5pt]

\input tufte

\startsmallformula
   \hbox{small and boring: } e = mc^2
\stopsmallformula

\input tufte

\stoptext

When ok i can incorporate the bodyfont key

Hans