\documentclass[compress, 9pt, german, t]{beamer}
\usepackage{etex}

\usepackage[english]{babel}
\uselanguage{English}
\languagepath{English}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{arev}
\usepackage{mathpazo}
\usepackage{microtype}

\usepackage{url}
\usepackage{listings}
\usepackage{xcolor}
\usepackage{tabu}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usetikzlibrary{shapes}
\usetikzlibrary{fit}

\usepackage{amsmath}
\usepackage{mathdots}
\usepackage{mathtools}
\mathtoolsset{showonlyrefs,showmanualtags}
\usepackage{mathrsfs}
\usepackage{csquotes}

\usepackage{todonotes}

\usepackage{beamerthemeLEA2}
\setbeamercovered{transparent}

\newcommand{\N}{\mathbb{N}}
\newcommand{\Z}{\mathbb{Z}}
\newcommand{\Q}{\mathbb{Q}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\C}{\mathbb{C}}
\newcommand{\Prob}{\mathrm{P}}
\newcommand{\Oh}{\mathcal{O}}
\newcommand{\Ih}{\mathcal{I}}
\newcommand{\Ell}{\mathcal{L}}

\newcommand{\abs}[1]{\left\vert #1 \right\vert}
\newcommand{\powerset}[1]{\mathcal{P}\left( #1 \right)}
\newcommand{\setnot}[1]{\overline{#1}}
\newcommand{\setsymdiff}{\,\triangle\,}

\newcommand{\defeq}{\coloneqq} %Mathtools already defines this

\DeclareMathOperator{\st}{s.t.}