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This just copies the definition of \underbrace adding an extra argument to hold the text and then finally using the text rather than the central part of the brace. \documentclass{article} \makeatletter \def\zzunderbrace#1#2{\mathop{\vtop{\m@th\ialign{##\crcr $\hfil\displaystyle{#1}\hfil$\crcr \noalign{\kern3\p@\nointerlineskip}% \zzupbracefill{#2}\...


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