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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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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:





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