[Tex/LaTex] How to make amsart section titles like chapters in Book/Report

amsartsectioning

I want them to look like this (also in toc):
http://www.sharelatex.com/learn-scripts/images/f/f8/SectionsChaptersEx3.png

How to achieve this?

I'm sorry if this was unclear. I want titles to look like

"Kapitel 1

Title"

and to show in table of contents as "1.Title".

Standard amsart doesn't look like this. And I don't want to use "Book" style, because then everything else breaks down.

Best Answer

Maybe not a perfect solution, but works in LyX in AMSART document type.

\usepackage{titlesec}
\titleformat{\section}{\Huge\bfseries}{\thesection}{1em}{}
 \titleformat{\section}{\Huge\bfseries}{Kapitel \thesection.}{-110pt}{\newline}

 \usepackage{titletoc}
 \titlecontents{section}
 [3.8em] % ie, 1.5em (chapter) + 2.3em
  {}
  {\contentslabel{2.3em}}
  {\hspace*{-2.3em}}
  {\titlerule*[1pc]{.}\contentspage}

Both packages used here have very good documentation: http://www.ctex.org/documents/packages/layout/titlesec.pdf