# Symbols:R/Extended Real Number Line

$\overline \R$
$\overline \R = \R \cup \set {+\infty, -\infty}$
The $\LaTeX$ code for $\overline \R$ is \overline \R .
MediaWiki $\LaTeX$ also allows \overline \reals, but MathJax does not recognise that as a valid code.