\documentclass[12pt]{article}
\usepackage{amsmath,amssymb,amsfonts}
\begin{document}
In the present paper, for a large family of topological semigroups namely,
compactly cancellative and right cancellative foundation semigroups $S$,
we study the topological centers of the Banach algebras $LUC(S)^*$ and
$M_a(S)^{**}$. We also give a generalization of a known result of
Lau and Losert by showing that for such topological semigroups the
topological center of $LUC(S)^*(M_a(S)^{**}$, respectively) is the same
as $M(S)(M_a(S)$, respectively).
\end{document}