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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Re: horizontal curly braces.****From**:*alanje@cogs.susx.ac.uk (Alan Jeffrey)***Date**: Tue, 17 Aug 93 17:24 BST

>by the way, when considering whether to use rules >for extenders or small pieces, take into account that the rule >approach yields lengths that exactly match the material being >braced, while pieces will yield only an approximation. In the case of \overbrace and \underbrace you can use leaders to fill the material precisely, in a similar fashion to \rightarrowfill. An appropriate definition would be something like (er, codes off the top of his head): \def\downbracefill{$\m@th\braceld \braceextd\mkern-\braceextwidth \cleaders\hbox{\braceextd}\hfill \mkern-\braceextwidth\braceextd \bracemidd \braceextd\mkern-\braceextwidth \leaders\hbox{\braceextd}\hfill \mkern-\braceextwidth\braceextd \bracerd$} This definition works, as long as the uses of \overbrace{foo} are when foo is wider than the width of \braceld\braceextd\bracemidd\braceextd\bracerd. The problem with extension pieces is when that's not the case... Alan.

**References**:**Re: horizontal curly braces.***From:*bbeeton <BNB@MATH.AMS.ORG>

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