Less than or equal on top of greater than or equal

Question

I found the commands $\gtrless$ and $\lessgtr$ in the package "amssymb".

https://milde.users.sourceforge.net/LUCR/Math/mathpackages/amssymb-symbols.pdf

I could not find a similar command with that add an equal sign to each, that is $\geq$ on top of $\leq$ and vice versa. Any help? Thanks

Answer 1

Maybe something like this...

\documentclass{article}
\usepackage{stackengine,scalerel}
\newcommand\gele{\mathrel{\hstretch{1.5}{%
  \stackanchor[1pt]{\scriptscriptstyle\geq}{\scriptscriptstyle\leq}}}}
\stackMath
\begin{document}
$a \gele b$
\end{document}

Or...if you want the symbol as wide as the original components,

\documentclass{article}
\usepackage{stackengine,scalerel}
\stackMath
\newcommand\gele{\mathrel{\stackanchor[1pt]{\vstretch{.5}{\geq}}{\vstretch{.5}{\leq}}}}
\begin{document}
$a \gele b$
\end{document}

Answer 2

You can do as follows, but… what should this mean?

\documentclass{article}
\usepackage{amsmath}
\makeatletter
\newcommand{\gele}{\mathrel{\mathpalette\gele@{\ge\le}}}
\newcommand{\lege}{\mathrel{\mathpalette\gele@{\le\ge}}}
\newcommand{\gele@}[2]{\gele@@#1#2}
\newcommand{\gele@@}[3]{%
  \vcenter{\offinterlineskip\m@th
    \sbox\z@{$#1\mkern3mu$}%
    \ialign{##\cr$#1#2$\cr\noalign{\vskip\wd\z@}$#1#3$\cr}%
  }%
}
\makeatother
\begin{document}
[
X\gele Y\lege Z
]
\begin{center}
$X\gele Y\lege Z$ \[2ex]
$\scriptstyle X\gele Y\lege Z$
\end{center}
\end{document}

Answer 3

Just for fun:

\documentclass{standalone}
\usepackage{mathtools}
\begin{document}
$a \rlap{\raisebox{0.7ex}{$\scriptscriptstyle\geq$}}%
  \raisebox{0.26ex}{\rotatebox{180}{$\scriptscriptstyle\geq$}} b$
\end{document}