4

Is there any package that makes the math symbols with blackboard bold style? For example, I want to have $mathbb{\leq}$

enter image description here

  • i've never seen "blackboard bold" inequalities. can you cite a published source? it they are in use, then they should be added to unicode, and i can make such a submission. – barbara beeton Mar 4 '16 at 16:38
  • No, I have not seen either. Just I have an order on a model and based on that order there is the order in the language. So to distinguish them but still be similar I would like to have mathbbleq: A \leq B iff [[A]] \mathbbleq [[B]]. – Fibo Kowalsky Mar 4 '16 at 16:54
  • 1
    . Bad idea, in my opinion, as it might easily be confused with \leqslant. – Bernard Mar 4 '16 at 17:05
  • @Bernard that's why I put thick part up that it will be less confused. – Fibo Kowalsky Mar 4 '16 at 18:01
5

If you are using pdftex, then you can use \pdfliteral like this:

\def\spleq{\mathrel{\hbox to5pt{%
   \pdfliteral{q .9963 0 0 .9963 0 0 cm .5 0 0 .5 0 1.5 cm 1 j 1 J .7 w
   10 8 m 0 3 l 10 -3 l S 0 1 m 10 -5 l S 2 2 m 10 6 l S Q}\hss}}}

$A \spleq B < C$

\bye

spleq

If you need different sizes in \scriptstyle and scriptscriptstyle then you use this modification:

\def\spleq{\mathrel{\mathpalette\spleqA\relax}}
\def\spleqA#1#2{\mkern1mu\hbox to\spleqB#1em{%
   \pdfliteral{q .9963 0 0 .9963 0 0 cm \spleqB#1 0 0 \spleqB#1 0 1\spleqB#1 cm 
   1 j 1 J .7 w 10 8 m 0 3 l 10 -3 l S 0 1 m 10 -5 l S 2 2 m 10 6 l S Q}\hss}%
   \mkern1mu}
\def\spleqB#1{\ifx#1\displaystyle.5\fi \ifx#1\textstyle.5\fi     
   \ifx#1\scriptstyle.35\fi \ifx#1\scriptscriptstyle.25\fi} 
  • 1
    What is pdfliteral? Does it also work in xetex or luatex? Where can I learn about it? – User Mar 4 '16 at 19:20
  • When using xetex, you must define \def\pdfliteral#1{\special{pdf:literal #1}}. When using luatex then you have no problem, because pdfliteral is ready, pdfTeX is a part of luatex. pdfliteral produces low levet PDF code, you can learn about it in PDF specification. – wipet Mar 4 '16 at 20:41
3

It could be perfected in scriptscript style, but I don't think you really need it in second level subscripts or superscripts.

\documentclass{article}
\usepackage{amssymb,pict2e}

\makeatletter
\DeclareRobustCommand{\bleqslant}{%
  \mathrel{\mathpalette\@bleqslant\relax}%
}

\newcommand{\@bleqslant}[2]{%
  \sbox\z@{$#1\m@th\leqslant$}%
  \ifx#1\displaystyle
    \def\@blqwd{0.75}%
  \else
    \ifx#1\textstyle
      \def\@blqwd{0.75}%
    \else
      \ifx#1\scriptstyle
        \def\@blqwd{0.7}%
      \else
        \def\@blqwd{0.65}%
        \linethickness{0.75\@wholewidth}%
      \fi
    \fi
  \fi
  \setlength{\unitlength}{\dimexpr\wd\z@+\dp\z@}%
  \vcenter{\hbox{%
    \begin{picture}(1,1)
    \roundcap\roundjoin
    \polyline(\@blqwd,0.3)(0.1,0.6)(\@blqwd,0.9)
    \polyline(0.1,0.4)(\@blqwd,0.1)
    \polyline(\@blqwd,0.8)(0.22,0.555)
    \end{picture}%
  }}%
}
\makeatother

\begin{document}

$\leqslant\bleqslant$

$\scriptstyle\leqslant\bleqslant$

$\scriptscriptstyle\leqslant\bleqslant$

\end{document}

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.