# Spaces between numbers or letters within math mode in Beamer

I have been looking in the and Latex companion, and I did not find what I want to make. I write transparencies in beamer for my lectures, and I have observe that the space between numbers or letters is too small in the big screen, making difficult to read them properly. I have tried to modify the spaces following the answer in this answer in StackExchange: Answer in Stack, but failed and obtain a strange error lists on a suppo-pdf.mkii file that begins with: Use of \@@mptopdf@@newabove doesn't match its definition. \@@mptopdf@@newabove. A minimal non working example of my achievement is:

\documentclass[xcolor=dvipsnames]{beamer} %Class presentation

\catcode\ =13 \def {\,}

\begin{document}

\begin{frame}{Here, I find error.}
$%Math mode... a 2 = 2 + 3$
\end{frame}

\end{document}


I have seen that beamer package modifies heavily the categories codes, or so I understood. Is there any way to make the command to make larger horizontal space work? As an example, here is the same equation tipped without and with spaces. Here Latex takes care of the spacing, leaving too few space for a presentation, in my opinion:

In the next picture, I add a \; space between letters:

• Welcome to TeX.Stackexchange! Mar 20 '19 at 11:02
• You are the first person to have this concern. I'd like to see some examples of this. Anyway, here is why this does not work. You are making a space into a macro. But beamer is build on top of tikz/pgf and the option names in tikz often use spaces in them, this includes most beamer options. So when you make space active all these options no longer work. Mar 20 '19 at 11:29
• I have added two pictures of the different equations to the question. Anyhow, is there any way to use the macro "trick" in beamer? Mar 20 '19 at 11:42
• @alfeliz I am afraid that the only way is to add these spaces manually. :( Mar 20 '19 at 11:44
• I don't really see any need to add spaces in this example, other than defining tag` probably to insert its own space. Mar 20 '19 at 11:46