Why is there two different commands for the same infinity symbol?

Question

Here are the two different commands that lead to the same symbol:

! Undefined control sequence. <recently read> \infin You have presumably loaded some code you have not shown that defines \infin (\infty is defined by latex) — David Carlisle, Commented Dec 19, 2022 at 21:20
always post a document which shows the issue, eg \documentclass{article} \begin{document} $\infty$ $\infin$ \end{document} — David Carlisle, Commented Dec 19, 2022 at 21:21
@DavidCarlisle That makes sense; I'm using the Markdown preview in VS Code to render it. How come they are not rendered on this website by the way? — SMMH, Commented Dec 19, 2022 at 21:22
we do not use mathjax on this site (as it is about tex, not javascript implementations of math rendering) — David Carlisle, Commented Dec 19, 2022 at 21:23
TeX rendering is turned off here because it's the code that matters. — Ian Thompson, Commented Dec 19, 2022 at 21:23

Rmano · Accepted Answer · 2022-12-19 21:22:10Z

3

The power of a complete example:

\documentclass{article}
\begin{document}
$\infin$
\end{document}

results in

! Undefined control sequence.
<recently read> \infin 
                       
l.3 $\infin
           $

So the answer is "there are not, unless you define them". 😉

answered Dec 19, 2022 at 21:22

Rmano

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