How to insert the "X is a subset of Y, but is not equal to Y" symbol?

Question

How can I insert the "X is a subset of Y, but is not equal to Y" symbol? I have tried using $\subsetneq$ , as in $X \subsetneq Y$ , but this yields the error message:

Undefined control sequence.

There is no problem using $\subseteq$ .

Code:

\title{Subset-Not-Equal-To}
\author{}
\date{}

\documentclass[8pt]{article}

\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}

\begin{document}
\maketitle

$X \subsetneq Y$
\end{document}

Could you provide a minimal example from \documentclass to \end{document}. I think that may be amssymb is the package that provides that symbol, but there is no option to see what you actually loaded. — Manuel, Jun 16 '14 at 16:31
A tip: You can use backticks ``` to mark your inline code as I did in my edit. — jub0bs, Jun 16 '14 at 17:45

Svend Tveskæg · Accepted Answer · 2020-09-07T20:25:45.320

30

You have to load the amssymb package. Here is a possible solution:

\documentclass{article}
\usepackage{amssymb}
\begin{document}
Type \verb|$A \subsetneq B$|'' to get$A \subsetneq B$''.
Type \verb|$A \subsetneqq B$|'' to get$A \subsetneqq B$''.
\end{document}

output

edited Sep 07 '20 at 20:25

answered Jun 16 '14 at 16:34

Svend Tveskæg

31,033

How to insert the "X is a subset of Y, but is not equal to Y" symbol?

1 Answers1