TOC/bookmark not accurate when containing math content (Something weird at ToC and math mode)

Question

I put at one of my sections this: $\left\langle a,b\right\rangle $ and what I get is something very wired!

Do you know why it's happens and I can I solve it? If there is a solution for it...

Here is MWE:

\documentclass{scrartcl}

\usepackage[unicode=true,pdfusetitle,
 bookmarks=true,bookmarksnumbered=false,bookmarksopen=false,
 breaklinks=false,pdfborder={0 0 0},pdfborderstyle={},backref=false,colorlinks=true]
 {hyperref}
\hypersetup{
 linkcolor=blue}

\begin{document}

\section{ABC $\left\langle a,b\right\rangle $}
\end{document}

Thank you!

Answer 1

Math mode stuff is not allowed in a bookmark. You should use \texorpdfstring{stuff in document}{stuff in bookmark>.

\documentclass{scrartcl}

\usepackage[unicode=true,pdfusetitle,
 bookmarks=true,bookmarksnumbered=false,bookmarksopen=false,
 breaklinks=false,pdfborder={0 0 0},pdfborderstyle={},backref=false,colorlinks=true]
 {hyperref}
\hypersetup{
 linkcolor=blue}

\begin{document}

\section{ABC \texorpdfstring{$\left\langle a,b\right\rangle $}{<a,b>}}

\end{document}