\documentclass[11pt,fleqn]{article} \usepackage[ngerman]{babel} \usepackage{amsmath} \usepackage{bbm} %Indikatorfunktion 1 \begin{document} $\mathbbm{1}_{[0, t_j]}$ \end{document}
underCover
\documentclass[11pt,fleqn]{article} \usepackage[ngerman]{babel} \usepackage{amsmath} \usepackage{bbm} %Indikatorfunktion 1 \begin{document} $\mathbbm{1}_{[0, t_j]}$ \end{document}
\documentclass[11pt,fleqn]{article} \usepackage[ngerman]{babel} \usepackage{amsmath} \usepackage{bbm} %Indikatorfunktion 1 \begin{document} $\mathbbm{1}_{[0\,,\, t_j]}$ \end{document}