# Beamer/LuaLaTeX: How to properly typeset math symbols?

The output of the following code wrongly typesets \tilde{T} in the second equation; how can it be fixed?

\RequirePackage{luatex85}
\documentclass[professionalfonts]{beamer}
\usetheme{metropolis}
\usefonttheme[onlymath]{serif}
\usepackage{amsmath,mathtools,bm}
\setbeamercolor{normal text}{fg=black}
\newcommand\vm[1]{\bm{#1}}
\newcommand\pbm[1]{\left(\mathbf{#1}\right)}

\begin{document}

\begin{frame}

\begin{align}
\vm{\Phi}_{,\gamma}^T & = \vm{P}_{,\gamma}^T\pbm{x}\,\vm{A}^{-1}\,\vm{B} = \left\{ \begin{array}{c c c c}
\phi_1 & \phi_2 & \cdots & \phi_n
\end{array} \right\}_{\left(1 \times n\right)},\\
%
\mathbf{\tilde{T}_s} & =%
\left\{%
\begin{array}{ccccc}
T_1 & T_2 & \cdots & T_n & \bm{0}_{\left( 1 \times m \right)}
\end{array}%
\right\}^T
\end{align}

\end{frame}

\end{document}


You should replace \mathbf{\tilde{T}_s} with \widetilde{\mathbf{T}}_{\mathbf{s}}. (Observe that the T and s characters are set in bold, whereas the "tilde" diacritic does not.)

\RequirePackage{luatex85}
\documentclass[professionalfonts]{beamer}
\usetheme{metropolis}
\usefonttheme[onlymath]{serif}
\usepackage{mathtools,bm}
\setbeamercolor{normal text}{fg=black}
\newcommand\vm[1]{\bm{#1}}
\newcommand\pbm[1]{\left(\mathbf{#1}\right)}

\begin{document}
\begin{frame}
$\mathbf{\tilde{T}_s}$ vs.\ $\widetilde{\mathbf{T}}_s$
\end{frame}
\end{document}

• Thanks for your answer. Additionally, is there any document that shows the alternatives to the typical symbol commands? I don't prefer to ask again whenever I stumble across incorrect symbol command. – Diaa Aug 21 '16 at 15:36
• @DiaaAbidou - I'm not sure what you have in mind in terms of "the alternatives to the typical symbol commands". For starters, what are "typical symbol commands"? FWIW, a rule -- which I believe is very much in the typographic mainstream -- that I apply to my own working papers is never to bold diacritical symbols such as \tilde, \hat, \widetilde, \widehat, and \bar. – Mico Aug 21 '16 at 18:54
• Thanks for advising not to bold these symbols. On the other hand, in my question for example, \tilde is replaced by \widetilde to properly typeset it using lualatex. My inquiry is: are there other symbols that need to be replaced when typesetting using lualatex? – Diaa Aug 21 '16 at 19:09
• @DiaaAbidou - Regardless of whether one uses pdfLaTeX or LuaLaTeX, I believe it's a good idea to use \widetilde and \widehat instead of \tilde and \hat for most uppercase Latin and Greek letters. (Exceptions are A, I, and L; S and C are borderline cases.) – Mico Aug 21 '16 at 19:42