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\newcommand{\BC}{\Bbb Z} 
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\title{}
\author{}
\date{}

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\begin{document}

\maketitle

\begin{center}
{{\Large\bf MODERN ALGEBRA I}\\
\bigskip

{\Large\bf HOMEWORK ASSIGNMENT IX}\\
\bigskip
{\bf (Turn in underlined problems.)}}
\end{center}

\vspace{.75in}

\noindent
{\bf 
\begin{tabbing}
\underline{\large\bf CHAPTER}\makebox[2in]{}\=\underline{\large\bf PROBLEMS}\\

\bigskip
\noindent
3 \> \underline{3.61},
\underline{3.62}, 3.63,
\underline{3.68},
\underline{3.75}, 3.76,
\underline{3.77}, 3.78
\end{tabbing}

}
\vspace{.75in}

\noindent
\underline{\large\bf ADDITIONAL PROBLEMS}
\vspace{.25in}

{\bf 
1. Determine whether the ring of $2\times 2$ upper triangular
matrices over $\BR$ is isomorphic to the ring of 
$2\times 2$ lower triangular
matrices over $\BR$.

\bigskip

2. Show that ${\BR}[x]\not\cong {\BR}[x,y]$.

}
\end{document}

