[Tex/LaTex] Blackboard bold variants for Greek letters

blackboard;fontsgreeksymbols

It is common (or it used to be) to use a blackboard-bold variant of \mu to denote roots of unity in some mathematical papers. However, despite searching (several times, periodically over several years) I have never been able to locate any package or technique that makes this possible, other than using Metafont or possibly hunting through the font definitions to see if it is something I can create a variant of (along the lines of the suggestions in Section 8 of the Comprehensive LaTeX symbol list).

Thus far, I haven't been sufficiently motivated to learn how to do any of this (although it probably would have resulted in a net time savings), and I feel like I cannot be the only person who would have tried. Is anyone aware of an existing way to produce this character?

Best Answer

The mbboard package provides blackboard bold Greek letters, and the letter you want is \bbmu. However, I don't know if you like how the symbol looks. (I don't like it, actually.)

The mathbbol package with the bbgreekl option also provides (a possibly nicer version of) \bbmu: Use \usepackage[bbgreekl]{mathbbol} in the preamble. The disadvantage is that the package also redefines \mathbb; see this post for possiblities to avoid this.

Note that lowercase epsilon is typeset with \bbespilon (sic).

Edit: I just realised that the mbboard package redefines \mathbb, too. If you don't like this, then an easy solution is to load the amssymb package after the mbboard package. This gives you the "usual" blackboard bold letters, and you can still use \bbmu and friends.

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