ich habe folgendes Minimalproblem:
\documentclass[12pt]{article} \usepackage{amsmath,amssymb,amsthm} \usepackage[ngerman]{babel} \usepackage[utf8x]{inputenc} \usepackage{url} \usepackage{lscape} \begin{document} \begin{tabular}{c} \begin{array}{c} T_k \end{array} \end{tabular} \end{document}