\documentclass[a4paper, danish]{article}

\usepackage{times}
\usepackage[T1]{fontenc}
\usepackage{babel}

\begin{document}

\section{Title}

{\large Hej verden\par}

{\large Bl\aa b\ae rgr\o d\par}

\subsection {Subtitle}

Math: $\sum_{i=0}^\infty \frac{1}{i^2} = \frac{\pi^2}{6}$

{\large\bf Big, bold\par}

{\Huge\bf Huge, bold\par}

\end{document}