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thank you so much frabjous.

It works perfect and my text looks much better now.

Sorry frabjous, I read the fact that you also use the mathclap command over.

Your attempt works very well. Thanks a lot.

But if I have the comment in the first line, e.g.

\begin{align*}
a+b&\overset{b=c-a}{=}a+c-a
&=c
\end{align*}

I have the problem with the distance between the equal sign and ...

Thanks you two. I think Stefans solution is smarter and easier to handle.

But there arises a problem. In the example

\documentclass{article} %I use scrreprt
\usepackage{mathtools}
\begin{document}
\begin{align*}
a&=b+c\\
&\overset{\mathclap{c=d+e}}{=}b+d+e
\end{align*}
\end{document}

the end of ...

I adopted the first proposal and it works very well. Thank you very much.

I modified it a bit (probably very dowdy). With your proposal the number of the section looks like 1.1 but because all other section numbers in my text have the form 1.1. I simply wrote

\section*{\refstepcounter{section ...

If I do it like that, the section gets numbered but not listed in the TOC. This is fine. But as I said I want to refer to the section:

\section*{\refstepcounter{section}\thesection\quad Section Title}\label{Section Title}

But in this case \ref{Section Title} does not refer to the correct section ...

Hello,

I have in my text many long equations and I write sometimes short comments above equal signs.

Example:

\begin{align*}
a&=b+c\\
&\overset{c=d+e}{=}b+d+e
\end{align*}

In those cases the two equal signs are not on top of each other but the upper equal sign is aligned with the comment above ...

Hello,

how can I avoid that a numbered section gets listed in the TOC?

What I already know:
\section{example} leads to a numbered new section which gets listed in the TOC.
\section*{example} leads to a new section which is not listed in the TOC but also gets no number. But I need a number for the ...