comma like \cdot

Question

What is the \cdot alternative for comma, or any other punctuation symbol? I want to raise comma symbol in a list of fractions to the fraction line. Comma is placed below when used next to fraction.

Answer 1

You can use \raisebox to move it where you want. Here is a comparison of the inline \frac and the displaystyle \dfrac. Based on @GonzaloMedina's suggestions I have provided two versions, each which provides slightly different spacing around the comma:

• one that uses \mathbin (spacing similar to \cdot) and
• another that uses \mathpunct (spacing more like a punctuation)

Code:

\documentclass{article}
\usepackage{amsmath}

\newcommand{\CommaBin}{\mathbin{\raisebox{0.5ex}{,}}}
\newcommand{\CommaPunct}{\mathpunct{\raisebox{0.5ex}{,}}}
\begin{document}

\verb|\mathbin|: $\frac{1}{2} \CommaBin \frac{3}{4} \CommaBin \dfrac{1}{2} \CommaBin \dfrac{3}{4}$

\bigskip
\verb|\mathpunct|: $\frac{1}{2} \CommaPunct \frac{3}{4} \CommaPunct \dfrac{1}{2} \CommaPunct \dfrac{3}{4}$
\end{document}