Identify and import a "curly precneq" from a package

Question

I would like to use the following symbol (from this answer, see the "Symbola" in the picture):

Ideally, I would like to have a command which make it appear without loading a package which may change the fonts in my text.
It is however very unclear to me how to adapt this answer in order to do so. Actually, I can't even find a package where the above pictured symbol is contained. Detexify doesn't help me.

Answer 1

Download the Symbola font (it's free) and place it in a working directory.

Prepare the following document and call it precneq.tex:

\documentclass{standalone}
\usepackage{fontspec}
\setmainfont{Symbola}[Path=./,Extension=.ttf]

\begin{document}
\symbol{"2AB1}
\end{document}

Compile it with XeLaTeX to obtain precneq.pdf.

Now copy this PDF file in the same directory as your main document. The code for using it is between \makeatletter and \makeatother (included) in the following test file.

\documentclass{article}
\usepackage{amsmath,graphicx}

\makeatletter
\DeclareRobustCommand{\precneq}{\mathrel{\mathpalette\use@precneq\relax}}
\newcommand\use@precneq{%
  \text{%
    \raisebox{-0.5ex}{%
      \scalebox{\f@size}{%
        \includegraphics[scale=0.1]{precneq}%
      }%
    }%
  }%
}
\makeatother

\begin{document}

$a\precneq b$ $a\preceq b$ $x_{\precneq}y_{\preceq}$

\medskip

{\Large $a\precneq b$ $a\preceq b$ $x_{\precneq}y_{\preceq}$}

\end{document}

Is it worth the pain? I'd simply import all the “prec” symbols from mathabx.

Answer 2

Here is a way:

\documentclass{article}
\DeclareFontFamily{U}{mathb}{\hyphenchar\font45}
\DeclareFontShape{U}{mathb}{m}{n}{ <-6> mathb5 <6-7> mathb6 <7-8>
mathb7 <8-9> mathb8 <9-10> mathb9 <10-12> mathb10 <12-> mathb12 }{}
\DeclareSymbolFont{mathb}{U}{mathb}{m}{n}

\DeclareMathSymbol{\precneq}{\mathrel}{mathb}{"AC}


\begin{document}

\[ a \precneq b\]%

\end{document}