# \mathbb with stix

Good morning, I have a trouble with stix package: when I write $\mathbb{R}$ I get a bad font. How could I do to get the same font in amsmath using stix? I alredy found a solution for my problem in this site: Looking for a blackboard bold (\mathbb) math font that is thicker than Latin Modern or Computer Modern... but it did not help me. I hope in your help. Thank you so much

• the whole point of the stix package is to provide the stix font collection rather than the AMS fonts. Can you provide a test document and say what output you want? Define "bad" do you get an error or do you just mean that you don't like the stix font design? Jun 19, 2021 at 14:40
• Thank you for your comment. Simply I dislike it
– Puck
Jun 19, 2021 at 15:30

One solution is to load \usepackage[bb=ams]{mathalpha}, or your blackboard font of choice, after stix2. You might also want the bbscaled= option if the alphabet you load is too big or small.

Keep in mind that legacy TeX is limited to sixteen 8-bit math symbol fonts with 256 symbols each. When you try to load more symbols on top of a big package like stix2, it is possible to run out..

If you can switch to LuaLaTeX or XeLaTeX, you could instead use the range= option of \setmathfont, This, for example, gives you the TeX Gyre Termes Math \mathbb instead of \stix2.

\usepackage{unicode-math} % Replaces all legacy font packages.

\setmainfont{STIX Two Text}
\setmathfont{STIX Two Math}
\setmathfont{TeX Gyre Termes Math}[
range=bb,
Scale=MatchUppercase]


You can instead use \usepackage{stix} in PDFLaTeX or \setmathfont{XITS Math} in LuaLaTeX or XeLaTeX to get version 1 of the STIX fonts. The methods of replacing the blackboard alphabet are the same.

• Thank you very much for your answer. I use stix, not stix2. However you have solved my problem with '\usepackage[bb=ams]{mathalpha}'
– Puck
Jun 19, 2021 at 15:37
• @Puck Thanks for the correction. I updated. Jun 19, 2021 at 23:32