1

I tried to follow the suggestion in this question regarding how to use blackboard bold symbols for both Greek and Latin letters in the same document.

Bizarrely, I find that when I use the suggested code in my preamble, commands like \mathbb{\Delta} and \mathbb{\Sigma} result in symbols completely unrelated to the desired ones.

\documentclass{amsart}

\usepackage{amsfonts}
\usepackage[bbgreekl]{mathbbol}

\DeclareSymbolFontAlphabet{\mathbb}{AMSb}
\DeclareSymbolFontAlphabet{\mathbbl}{bbold}

\begin{document}

$\mathbb{\Delta}$

$\mathbb{\Sigma}$

\end{document}

generates the output

enter image description here

I see the same problem compiling on my own computer, and compiling on Overleaf. Does anyone have suggestions for how to fix this? As in the question linked above, my goal is to use the AMS blackboard bold font for Latin letters and the bbgreekl font for capital Greek letters. In other words, my goal is to use

blackboard bold N

and

blackboard bold Delta

in the same document.

5
  • Why not using mathbbol's font for all blackboard bold symbols?
    – Vincent
    Oct 11, 2022 at 15:57
  • The mathbbol version of $\mathbb{N}$ is rather unusual and ugly (it's sans serif, for one thing). This was essentially the reason for the discussion at the linked question.
    – Dan Ramras
    Oct 11, 2022 at 16:01
  • I just found an alternative way to achieve my endgoal, using this answer. I'm curious what is causing the strange behavior above, but maybe it is moot.
    – Dan Ramras
    Oct 11, 2022 at 16:14
  • 2
    the behaviour you show is what I'd expect: you are selecting a font that has no Greek and then using commands for Greek, so you get whatever symbol is in that slot. Oct 11, 2022 at 16:38
  • The situation is similar to what I've explained in tex.stackexchange.com/a/281200/82917
    – campa
    Nov 17, 2022 at 18:57

2 Answers 2

1

You've defined a math symbol font as \mathbbl, so you can just change those calls to

$\mathbbl{\Delta}$

$\mathbbl{\Sigma}$

and the double-struck Greek that you want should result.

0

Just quoting from David Carlisle's comment to prevent the question from staying unanswered: "The behaviour you show is what I'd expect: you are selecting a font that has no Greek and then using commands for Greek, so you get whatever symbol is in that slot."

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