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I know that \ell gives me this nice mathematical "calligraphic" letter l, which I want to use throughout my document. However, it is also a common typographic convention that vectors are typeset in boldface as opposed to having a little arrow on top of them.

Hence: How do I get a boldface \ell? Simply enclosing it in \mathbf does not work...

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2 Answers 2

up vote 11 down vote accepted

You can use \boldsymbol from the amsbsy package; if you are going to use the symbol very often, then you can define a new command, as in the following example:

\documentclass{article}
\usepackage{amsmath,amsbsy}

\newcommand*\Bell{\ensuremath{\boldsymbol\ell}}

\begin{document}

\Bell

\end{document}
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\documentclass{article}
\begin{document}

$\ell$\boldmath$\ell$\unboldmath

\end{document}

enter image description here

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