[MiKTeX] Centering enumerated lists

[Louis F. L. <lou...@ve...>]

Can anyone tell me why the following enumerated list won't center with the
code below.
I am using the Seminar pkg. to create slides

It comes out flushleft regardless of what I try

\begin{center}
\begin{enumerate}
        \item{As $x \longrightarrow -\infty,  R(x) \longrightarrow 1$}
        \item{As $x \longrightarrow 2^{-},  R(x) \longrightarrow \infty$}
        \item{As $x \longrightarrow 2^{+}, R(x) \longrightarrow \infty$}
        \item{As $x \longrightarrow +\infty,  R(x) \longrightarrow 1$}
\end{enumerate}
\end{center}

Louis F. Lowell