As @barbara beeton noted here, the mathbb of AMS and the other blackboard fonts right now are not compatible with Computer Modern (CM) font family default in LaTex. So it may be necessary to create a new mathbb compatible with CM. Creating it from the CM bold and bold math italics may be one possible way. The result is as in the picture:

enter image description here

Note: I first created the mathbb letters by Adobe Illustrator CC 2018 and then transformed them into otf files by Fontlab 7.

But unfortunately I am not able to write them into a package, who can do that?

The package can be named as cmathbb.

  • If not by others, I'll try my level best, but need fonts in OTF format
    – MadyYuvi
    Sep 9, 2020 at 4:57
  • 3
    This looks like just unfilled outlines. You don't need an extra font for that, just some PDF magic. \newcommand*\cmathbb[1]{\mathbf{\pdfsave\pdfliteral{0 w 1 Tr}#1\pdfrestore}} Sep 9, 2020 at 5:35
  • @HenriMenke But in this way the letters would be a little larger, and also it can only used in PDFLatex?. So it's neccessary to create a new font with some improvements.
    – M. Logic
    Sep 9, 2020 at 5:41
  • 3
    The open font you show does not look at all like the style normally associated with blackboard bold. It should look like a font with extra strokes added, simulating boldness, not a lighter font made by hollowing out the outlines. Sep 9, 2020 at 6:40
  • @David Carlisle In fact, blackboard bold font is one kind of double stroke font which was created to write bold letters conveniently on the blackboard since we can't write letters in a high weight with chalks .
    – M. Logic
    Sep 9, 2020 at 6:48


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