# How does one TeX a blank?

By blank, I'm looking to TeX something like this:

$\{\emptyset\}$ _ $\{\emptyset,\{\emptyset\}\}$, but I want the _ to look more like a longer blank as you'd see in a fill-in-the-blank type of question. Thanks.

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You can use \underline with an argument of \hspace. For example,

\documentclass{article}
\begin{document}
$\emptyset$\underline{\hspace{1in}}$\emptyset,\emptyset$
\end{document}

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\documentclass[11pt]{article}