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\documentclass{article} \begin{document} $\underline{\nabla}$ \end{document}


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\documentclass{article} \usepackage{amsmath} \begin{document} $\underbar{\hbox{$\nabla$}}$ \end{document} or, alternately, \documentclass{article} \usepackage{amsmath} \begin{document} $\setbox0=\hbox{$\nabla$}\underbar{\box0}$ \end{document}


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