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+% Display math.
+\usepackage{amsmath}
+\usepackage{mathtools}
+\usepackage{amssymb}
+
+% New enviroment for remarks.
+\newtheorem{bem}{Bemerkung}
+
+% New commands for math operators.
+% Binomial coefficients.
+\renewcommand{\binom}[2]{
+ \biggl(
+ \begin{matrix}
+ #1 \\
+ #2
+ \end{matrix}
+ \biggr)
+}
+% Euler numbers, first kind.
+\newcommand{\eulerI}[2]{
+ \biggl\langle
+ \begin{matrix}
+ #1 \\
+ #2
+ \end{matrix}
+ \biggr\rangle
+}
+% Euler numbers, second kind.
+\newcommand{\eulerII}[2]{
+ \biggl\langle
+ \negthinspace
+ \biggl\langle
+ \begin{matrix}
+ #1 \\
+ #2
+ \end{matrix}
+ \biggr\rangle
+ \negthinspace
+ \biggr\rangle
+}
+% Stirling numbers, first kind.
+\newcommand{\stirlingI}[2]{
+ \biggl[
+ \begin{matrix}
+ #1 \\
+ #2
+ \end{matrix}
+ \biggr]
+}
+% Stirling numbers, second kind.
+\newcommand{\stirlingII}[2]{
+ \biggl\{
+ \begin{matrix}
+ #1 \\
+ #2
+ \end{matrix}
+ \biggr\}
+}