snippet frac "\\frac" iA
\\frac{$1}{$2}$0
endsnippet

snippet fun "Function" wA
f: \R \to \R
endsnippet
snippet sum "\sum_" wA
\sum_{n=1}^{${1:\infty}} $0
endsnippet
snippet !> "\mapsto" wA
\mapsto
endsnippet
snippet -> "\to" wA
\to
endsnippet

snippet report "\documentclass{report}"
\documentclass{report}
\usepackage[a4paper,margin=30truemm]{geometry}
\usepackage{polyglossia}
% font
\usepackage{fontspec}
\setmainfont{IBM Plex Sans}
\setmonofont{IBM Plex Mono}

\title{$1}
\author{Robert Günzler}
\date{\today}

\begin{document}

$0

\end{document}
endsnippet

snippet brief "\documentclass{dinbrief}"
\documentclass{dinbrief}
\usepackage{graphicx}
\usepackage[a4paper,margin=30truemm]{geometry}
% language
\usepackage{polyglossia}
\setdefaultlanguage[spelling=new]{german}
% font
\usepackage{fontspec}
\setmainfont{IBM Plex Sans}
\setmonofont{IBM Plex Mono}
% dinbrief options
\nowindowtics
\nowindowrules

% unterschrift
\newcommand{\setsign}{\includegraphics[height=30truemm]{/home/robert/Pictures/sign.png}}
\signature{Robert Günzler}
\address{
% absender
  Robert Günzler \\\\
  STREET \\\\
  PLZ Berlin}

\date{\today}
\place{Berlin}

% betreff
% \subject{{\bf anliegen}}

\begin{document}
\begin{letter}{
% empfänger
  $1}

\opening{${2:Sehr geehrte Damen und Herren,}}

$0

\vspace{10truemm}
\closing[\protect\setsign]{${3:Mit freundlichen Grüßen}}
\end{letter}
\end{document}
endsnippet