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 :