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## Re: [AUCTeX] Carets and underscores become red occasionally in math mode

 From: Arash Esbati Subject: Re: [AUCTeX] Carets and underscores become red occasionally in math mode . Date: Mon, 13 Aug 2018 21:31:03 +0200 User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1

"Kourosh Kalayeh" <address@hidden> writes:

> I have a minor question regarding the syntax highlighting in math mode
> that has been bugging me for a while.  I was wondering if anyone can
> help me with that.  Here it is,
> AUCTeX sometimes color the caret (^) and the underscore (_) red in
> math mode (which should normally be orange).  I could not find the
> reason of this behavior. For example look at the attached two
> screenshots, they are both from one document, in one of them
> everything is orange, and in the other one the caret and underscore
> signs are red.
> I use “align” environment for my equations.

Hi Kourosh,

I can't reproduce what you're describing.  This is how your examples
look for me.  N.B. I don't use any themes or any customization to AUCTeX
fonts:



Maybe you disable any themes (if any) and try it again.  For the next
time, please also send some code which can be copy&pasted; it is tedious
to type code.  Here the code I used:

--8<---------------cut here---------------start------------->8---
\documentclass[10pt]{article}

\usepackage{amsmath}

\begin{document}
\begin{align}
\label{eq:1}
\Phi(\lambda_1, \lambda_2, \lambda_3) = \sum_{n=1}^N
\frac{\mu_n}{\alpha_n} (\lambda_1 ^ {\alpha_n} + \lambda_2 ^
{\alpha_n} + \lambda_3 ^ {\alpha_n} -3),
\end{align}
increment $t$,
\begin{align}
\label{eq:2}
\matr{\ddot{u}} |_{(t)} = \matr{M} ^ {-1 \cdot (\matr{P} - \matr{I})
|_{(t)}}.
\end{align}
\end{document}
--8<---------------cut here---------------end--------------->8---

Best, Arash