# How to write this Subscript for Lagrangian Minimization Equation in Beamer

So I want an \alpha below the word 'minimise' as in this paper in equation 5 and 6.

Welcome to TeX.SE! You could use

\documentclass{beamer}
\usepackage{amsmath}
\DeclareMathOperator*{\minimize}{minimize}
\begin{document}
\begin{frame}[t]
\frametitle{A slide}
$\minimize_{\{\alpha\}} \|\boldsymbol{\mathrm{i}}-\boldsymbol{\Phi\mathcal{D}\alpha}\|_2 +\lambda \|\boldsymbol{\alpha}\|_1$
or
$\displaystyle\minimize_{\{\alpha\}} \|\boldsymbol{\mathrm{i}}-\boldsymbol{\Phi\mathcal{D}\alpha}\|_2 +\lambda \|\boldsymbol{\alpha}\|_1$
\end{frame}
\end{document}


Notice that none of this is specific to beamer.

• Nice answer! One tiny comment: you don't need \usepackage{amsmath}, beamer already loads it. Jan 18, 2019 at 9:07
• @samcarter Thanks! That's correct. (I still want to keep it because I mention that this is not specific to beamer.)
– user121799
Jan 18, 2019 at 15:06
• Oh, right! Then it makes sense to keep it Jan 18, 2019 at 15:09