How to use zeta(ζ) symbol in LaTeX?

The symbol zeta is a letter of the Greek alphabet. This symbol is commonly used in mathematics and physics.

You don’t need any package to print this symbol in a LaTeX document, you just need to use LaTeX’s default \zeta command.

Below are some examples of how this symbol is used in LaTeX.

\documentclass{article}
\begin{document}
   \[ \zeta(2)=\frac{\pi^2}{6} \]
   \[ \zeta(s)=\sum^\infty_{n=1}\frac{1}{n^s} \]
   \[ \frac{1}{\zeta(s)} \]
\end{document}

Output :

Zeta symbol using upgreek package

There is another way to print Zeta symbols on latex. For this, you need to use a package which is upgreek. This package provides a \upzeta command that you can use to print this symbol to a LaTeX document.

But in this case, the output will be slightly different. let’s see

\documentclass{article}
\usepackage{upgreek}
\begin{document}
   \[ \verb|\zeta|\rightarrow \zeta \quad \verb|\upzeta|\rightarrow \upzeta \]
   \[ \upzeta(2)=\frac{\pi^2}{6} \]
   \[ \upzeta(s)=\sum^\infty_{n=1}\frac{1}{n^s} \]
   \[ \frac{1}{\upzeta(s)} \]
\end{document}

Output :