The first image is what I have at the moment, the second image is what I would like to get. As you can see, in the second image the formula font size is a little bit bigger than in the first image. I would like to make all the formulas font size a little bit bigger. I tried using, as suggested here, \DeclareMathSizes{14}{15}{7}{7}
(note that in beamer I am using 14pt as font size) but it did not produce any effect.
\documentclass[14pt,handout,t]{beamer}
\usepackage{lmodern}
\usepackage[english,italian]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\geometry{paperwidth=297mm,paperheight=210mm}
\usefonttheme{professionalfonts}
\renewcommand{\sfdefault}{phv} %change font
\DeclareMathSizes{14}{15}{7}{7}
\begin{document}
\begin{frame}
complesso: $\alpha=\alpha_{r}+i\alpha_{i}$
\end{frame}
\end{document}
Best Answer
In your linked question Yiannis writes:
That is not a hundred percent correct. You have to use the font size you actually use at the moment. You can output it in the log with
and in your MWE this shows
So the beamer option
14pt
uses actually a14.4pt
font size and you have to useor
that it works.