Is there a \subseteqless command?

Question

Is there a \subseteqless command? I mean something like \gtreqqless. If not, how can I define it myself.

Can you post a scan of a hand-drawn approximation of what the composite symbol is supposed to look like? — Mico, Nov 19 '17 at 14:13

score 6 · Answer 1 · answered Nov 19 '17 at 15:06

Stack the symbols, with some small adjustments due to different bounding boxes

\documentclass{article}
\usepackage{amsmath}

\newcommand{\subeqsupset}{%
   \mathrel{\vcenter{
     \offinterlineskip
     \hbox{$\subset$}
     \kern.2ex
     \hbox{$=$}
     \kern-.1ex
     \hbox{$\supset$}
   }}%
}

\begin{document}

$X \subeqsupset Y$

\end{document}

score 3 · Accepted Answer · answered Nov 19 '17 at 14:42

Does one of the following solutions work for you?

Note that the solutions are only meant to "work" in textstyle and displaystyle math settings. I sincerely hope they will never, ever be used in first-level, let alone second-level, subscript and superscript positions.

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

\newcommand{\subseteqqsupset}{%
   \mathrel{\vcenter{\hbox{$\overset{\textstyle\subseteqq}{\supset}$}}}}
\newcommand{\smallsubseteqqsupset}{%
   \mathrel{\vcenter{\hbox{$\overset{\subseteqq}{\scriptstyle\supset}$}}}}

\begin{document}
$u \subseteqqsupset v \smallsubseteqqsupset w$
\end{document}

Is there a \subseteqless command?

2 Answers2