\documentclass[12pt]{article}
\usepackage{amsmath,amssymb,amsfonts}
\begin{document}
Using the irreducible representations of the group SO$(d+1)$, we discuss the
degeneracy symmetry of hydrogen atom in $d$-dimensions and calculate its energy
spectrum as well as the corresponding degeneracy. We show that SO$(d+1)$ is
the energy spectrum generating group.
\end{document}