# notation for the external set of all positive unlimited real numbers [duplicate]

This question already has an answer here:

I couldn't find the notation for the external set of all positive unlimited real numbers. It's like the symbol of infinity with a slash over it I've tried \ninfty in fashion of \nequal but it didn't work you can find this notation in this book Nonstandard Analysis in Practice

## marked as duplicate by Sebastiano, Phelype Oleinik, Stefan Pinnow, Mico, CircumscribeDec 4 '18 at 17:00

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

## 1 Answer

Like this?

\documentclass{article}
\usepackage{stackengine}

\begin{document}

$\stackMath\stackinset{c}{0pt}{c}{0pt}{/}{\infty}$

\end{document}