Blackboard bold capital Delta with Euler fonts

Question

I would like to draw a blackboard bold capital delta, but I would like to draw this while using the Euler package to get the Euler fonts.

I have tried both solutions mentioned in the first answer to this question but either they don't seem to work with capital delta or it is overwritten by the Euler package.

I also took a look at this question but I am not satisfied with the solution -- the symbol has two peaks.

\documentclass{article}

\usepackage{euler}
\usepackage{bbm}
\usepackage{mathbbol}

\newcommand{\DD}{\Delta\!\!\!\Delta}

\begin{document}

     $\mathbbm{\Delta}$ 
     %Using mathbbm -- isn't math bold

     $\mathbb{\Delta}$ 
     %Using mathbbol -- still isn't math bold

     $\DD$ 
     %Hacky, and I dislike the two peaks

\end{document}

The following code \newcommand{\Dd}{\Delta\!\!\!{\scalebox{0.7}{$\Delta$}}} works okay, but it's kind of hacky and I find it hard to believe that nobody has wanted to do this before. — David Mehrle, Mar 24 '17 at 19:29

score 3 · Answer 1 · answered Mar 25 '17 at 03:58

If you want to take the capital Delta from Euler and the blackboard Delta from mathbbol, then you need to use something other than \Delta to access it as \Delta is redefined by euler.sty. This is pretty straightforward. Here I define a \bbDelta macro to parallel the \bbdelta one.

\documentclass{article}
\usepackage{euler}
\usepackage{bbm}
\usepackage[bbgreekl]{mathbbol}
\DeclareMathSymbol\bbDelta  \mathord{bbold}{"01}

\begin{document}

\[
  \bbDelta
\]

\end{document}

score 3 · Accepted Answer · answered Mar 25 '17 at 12:35

This might be what you want:

\documentclass{article}
\usepackage{euler}
\usepackage{pict2e,picture}

\makeatletter
\DeclareRobustCommand{\bbDelta}{{\mathpalette\bb@Delta\relax}}
\newcommand{\bb@Delta}[2]{%
  \begingroup
  \sbox\z@{$\m@th#1\Delta$}%
  \dimendef\Dht=6 \dimendef\Dwd=8
  \setlength{\Dwd}{\wd\z@}%
  \setlength{\Dht}{\ht\z@}%
  \begin{picture}(\Dwd,\Dht)
  \put(0,0){$\m@th#1\Delta$}
  \put(.42\Dwd,.7\Dht){\line(10,-26){.25\Dht}}
  \end{picture}%
  \endgroup
}
\makeatother

\begin{document}

x$\Delta\bbDelta$ $\scriptstyle\Delta\bbDelta$

x$\bbDelta\Delta$ $\scriptstyle\bbDelta\Delta$

\end{document}

Blackboard bold capital Delta with Euler fonts

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