Creating a \precneq symbol

Question

Going through the comprehensive symbols list, and also Detexify, we see that through various packages (mostly amssymb) we can get the symbols

• \prec Precedes. Unicode U+227A: ≺
• \preceq Precedes or equals to. Unicode U+227C: ≼
• \precsim Precedes or equivalent to. Unicode U+227E: ≾
• \precnsim Precedes and not equivalent to. (I don't think there is a unicode symbol for this one) Edit: as David Carlisle points out I just didn't scroll down far enough. It is Unicode U+22E8.

Its cousin < supports variants \leq and \lneq. Evidently, however, there is no \precneq equivalent for the "precedes" symbol.

Question: Has someone already constructed the symbol and placed it in a package? If not, how can I construct such a symbol? It should start from the AMS \preceq symbol and drop a cancelling sign over the equals-to part only.

Edit: for clarification, something like the following is what I desire:

Answer 1

Lost symbol sighted in mathabx. :)

\documentclass{article}
\usepackage{mathabx}
\begin{document}
$\precneq$
\end{document}

EDIT: A nice resource in such cases, the Comprehensive Symbol List. I admit, at times it can be quite tedious browsing it for a given symbol... but so far it's the best thing I know of.

Answer 2

U+22E8 is PRECEDES BUT NOT EQUIVALENT TO

Although the reference glyph has a negated wavy line rather than a negated straight line

see http://www.w3.org/2003/entities/2007doc/022.html

Other information about that character from the source of that document:

  <character id="U022E8" dec="8936" mode="math" type="relation">
     <unicodedata category="Sm" combclass="0" bidi="ON" mirror="Y" mathclass="R"/>
     <afii>21B1</afii>
     <latex>\precedesnotsimilar </latex>
     <Elsevier grid="blr" ent="prnsim">
        <desc>precedes, not similar</desc>
     </Elsevier>
     <AMS>\precnsim</AMS>
     <APS>prnsim</APS>
     <Wolfram>NotPrecedesTilde</Wolfram>
     <entity id="prnsim" set="8879-isoamsn">
        <desc>/precnsim N: precedes, not similar</desc>
     </entity>
     <entity id="prnsim" set="9573-1991-isoamsn">
        <desc>/precnsim N: precedes, not similar</desc>
     </entity>
     <entity id="prnsim" set="9573-2003-isoamsn">
        <desc>/precnsim N: precedes, not similar</desc>
     </entity>
     <entity id="precnsim" set="mmlalias">
        <desc>alias ISOAMSN prnsim</desc>
     </entity>
     <font name="hlcra" pos="235"/>
     <operator-dictionary form="infix" lspace="5" rspace="5" priority="265"/>
     <description unicode="1.1">PRECEDES BUT NOT EQUIVALENT TO</description>
  </character>

Answer 3

Here the unicode solution with use of fontspec and the font you like:

% arara: lualatex

\documentclass{article} 
\usepackage{fontspec}
\usepackage{booktabs}
\usepackage{caption}
\newcommand*{\test}[1]{{\fontspec{#1}\symbol{"2AB1}}}
\textwidth=6.5cm

\begin{document} 
\begin{table}
\centering
\caption{U+2AB1 -- PRECEDES ABOVE SINGLE-LINE NOT EQUAL TO}
\begin{tabular}{ll}\toprule
    Font & Symbol\\\midrule
    Code2000 & \test{code2000.ttf}\\
    Quivira & \test{quivira.otf}\\
    STIX Math & \test{STIX Math}\\
    Symbola & \test{symbola.ttf}\\\bottomrule
\end{tabular}
\end{table}
\end{document}

---

And here are two more fonts with help of the package unicode-math:

% arara: lualatex

\documentclass{article} 
\usepackage{unicode-math}

\begin{document} 
\setmathfont{XITS Math}
$A\precneq B\succneq C$

%\setmathfont{Cambria Math} % not available on my system
%$A\precneq B\succneq C$

\setmathfont{Asana Math}
$A\precneq B\succneq C$
\end{document}