\usepackage[utf8]{inputenc} \usepackage[ngerman]{babel} \usepackage[margin=1in]{geometry} \usepackage{amsmath,amsthm,amssymb,amsfonts} \usepackage{mathtools} \usepackage{pdfpages} \usepackage{hyperref} \usepackage{stmaryrd} \usepackage{enumerate} \usepackage{tabu} \usepackage{makeidx} \makeindex