How to represent bold greek letters in LaTeX?

When creating documents in LaTeX, sometimes we need bold Greek letters. In that case, even if you try to bold the Greek letter with \mathbf or \textbf command, nothing works.

So in this tutorial, we will discuss the best way to print Greek letters in bold style in a document.

Bold greek letters using amsmath package

amsmath package provide \boldsymbol{} and \pmb{} commands. These two commands print letters in bold style format. So you can use any of these.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
 \begin{center} Default size: \end{center} 
  $$ \alpha \quad \beta \quad \gamma \quad \lambda \quad \Sigma \quad \psi \quad \varepsilon $$ 
 \begin{center} Using \verb|\boldsymbol{}| command: \end{center} 
  $$ \boldsymbol{\alpha \quad \beta \quad \gamma \quad \lambda \quad \Sigma \quad \psi \quad \varepsilon} $$
 \begin{center} Using \verb|\pmb{}| command: \end{center}
  $$ \pmb{\alpha \quad \beta \quad \gamma \quad \lambda \quad \Sigma \quad \psi \quad \varepsilon} $$
\end{document}

Output :

Bold greek letters using bm package

Another package is bm, you can use \bm command included in this package to print letters in bold in the document.

\documentclass{article}
\usepackage{bm}
\begin{document}
 \begin{center} \verb|Default size:| \end{center}
  $$ \alpha \quad \beta \quad \gamma \quad \lambda \quad \Sigma \quad \psi \quad \varepsilon $$
 \begin{center} Using \verb|\bm| command:\end{center}
  $$ \bm{\alpha \quad \beta \quad \gamma \quad \lambda \quad \Sigma \quad \psi \quad \varepsilon} $$
\end{document}

Output :

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