5

Is there a way to produce blackboard bold Cyrillic letter?

(I know I can do Greek letters with mathbbol, but I need $\mathbb{Л}$.)

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  • 5
    sadly, i don't know of any font that contains blackboard bold cyrillic. however, if you can find a published source in russian that uses these letters, they are good candidates for addition to unicode, and i would be happy to forward a request to the unicode committee. but they do require a published reference. Commented Oct 24, 2015 at 22:38
  • I’ll be very interested in ‪a blackboard bold multiocular O‬. Commented Oct 24, 2022 at 11:33

2 Answers 2

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Not really pretty, but unless you find an open shape Cyrillic font, I see not much more to do.

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\usepackage{amsmath}

\DeclareRobustCommand{\bbel}{%
  \mathord{\text{%
    \ooalign{%
      Л\cr
      \hidewidth\kern0.125em I\hidewidth\cr
    }%
  }%
}}

\begin{document}

$x\bbel y^{\bbel}$

\end{document}

enter image description here

2

For the particular symbol you mention you could fake it by adding a vertical rule to the symbol either to the left or right of the main vertical stem or (egreg's suggestion) print a capital I close to the symbol or double print the symbol with a small separation

Sample output

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}

\begin{document}

Л

$\mbox{Л\kern-0.4em\vrule height 1.55ex depth 0ex width 0.08em}$

$\mbox{Л\kern-0.05em\vrule height 1.58ex depth 0ex width 0.08em}$

$\mbox{Л\kern-.15emI}$

$\mbox{Л\kern-0.9emЛ}$

\end{document}

But really one should go back to metafont and make a proper set of symbols.

2
  • Why not an I? There is in the repertoire.
    – egreg
    Commented Oct 28, 2016 at 12:36
  • @egreg Because I didn't think of such a good suggestion - now added to the samples above. Commented Oct 28, 2016 at 12:47

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