Anbei meine Präambel und der Code:
\documentclass[12pt,a4paper, BCOR=10mm]{article} \usepackage[utf8]{inputenc} \usepackage[german]{babel} \usepackage[T1]{fontenc} \usepackage{makeidx} \usepackage{amsmath} \usepackage{amssymb} \usepackage[pdftex]{graphicx} \usepackage{multirow} \usepackage{tabularx} \usepackage{setspace}\spacing{1.8} \usepackage[a4paper, left=5cm,right=15mm,top=25mm,bottom=25mm]{geometry} \usepackage[backend=bibtex,style=alphabetic, citestyle=authoryear]{biblatex} \bibliography{Literatur2.bib} \author{Madeleine} \title{Bachelorarbeit}
% \begin{equation} P_{1n} = \dfrac{\text{exp}^{\mu V 1 n}} {\Sigma^ {I _{j=1}} \text{exp} ^{\mu V j n}} = \dfrac{1}{1+ \Sigma^{I _ {j=2}} \text{\exp}^ {\mu \left(V_{jn} \minus V_{1n}\right)}} \end{equation} &