Right now, I have \mathbb{C} and \boldsymbol{\mathbb{C}} both producing the same character. What package/command do I need to get a bolder character?


In the modern toolchain with unicode-math, \boldsymbol\mathbb works if you load a math font with a bold version (as of July 2019, XITS Math, Libertinus Math or Minion Math) or if you manually load a bold math font with, for example, \setmathfont[version=bold]{Minion Math Semibold}.

Otherwise, as Sebastiano beat me to saying, load mathalpha (formerly mathalfa) with a double-struck font that comes in bold (such as [bb=px]) and use its \mathbbb.


Here there is my proposal as an alternative. You could to use bb = boondox + mathalpha (as suggest by the user @Davislor - see comment and your nice answer), but it changes the nature of the symbol. You have always the bold.

Here there is a little code

\usepackage[bb = boondox]{mathalpha}
$\mathbb{R}, \mathbbb{R}, \mathbbb{Z}$

and a screenshot: enter image description here

  • Note that the package has been renamed mathalpha. – Davislor Jul 15 '19 at 20:03
  • @Davislor I didn't know and thank you very much. Then in my book I change it, because I use this name. – Sebastiano Jul 15 '19 at 20:05
  • 1
    It might still be a good idea to use mathalfa in our examples for a while, because that’s still supported for backward-compatibility and it might take a while for everyone to update. – Davislor Jul 15 '19 at 20:06

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