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I'd like to create a blackboard math operator as \bbsum, \bbprod, \bbint, ... ? I don't know where to begin. Could someone help me? Thank you so much Best regards. Puck

First Edit: I'm trying with \usepackage{bbold} but the result is ugly. How can I improve?

7
  • The traditional approach is to use the metafont program. A quick and dirty solution is to draw the symbol using TikZ. OTOH, be sure to check The Comprehensive LaTeX Symbol List (CTAN). Sep 28 at 14:03
  • Ok, thank you. But how?
    – Puck
    Sep 28 at 14:10
  • font design isn't really on topic here and is a very different skill and toolset to typesetting Sep 28 at 14:11
  • I've never actually used Metafont. TikZ has a manual, and you can Google CTAN (ctan.org/tex-archive/info/symbols/comprehensive/?lang=en). Sep 28 at 14:12
  • 1
    In my opinion, blackboard bold fonts should be used … when writing on blackboard
    – Bernard
    Sep 28 at 15:25
4

I agree that below suggestion is not a good idea, but it works:

\documentclass{book}
\usepackage{xcolor}
\usepackage[outline]{contour}
\newcommand*{\fancy}[1]{\color{white}\contour{black}{#1}}

\newcommand{\bbint}{\fancy{$\displaystyle\int$}}
\newcommand{\bbsum}{\fancy{$\displaystyle\sum$}}
\begin{document}
\[
\bbint\qquad \bbsum
\]
\end{document}

Output

enter image description here

3
  • Why wouldn’t that be a good idea?
    – Gaussler
    Oct 6 at 11:52
  • I thought some legends like egreg David Carlisle and Ulrike Fischer, (so many legends etc.), may give better suggestion than this, so only I said like that...
    – MadyYuvi
    Oct 6 at 12:36
  • Well, none of them have provided an alternative answer. So perhaps they were satisfied with yours. Or perhaps they had other things to do. Who knows. ;-)
    – Gaussler
    Oct 6 at 12:40

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