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\title{General Mathematics and CPS II}
\author{Exercise 1}
\date{February 3, 2012}
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\begin{enumerate}

\item Ivanov, p.\ 87, Problem 5.

\item Write out a complete proof for Ivanov, p.\ 89, Theorem 2.

\item Write out the proof that (2) implies (3) and (3) implies (1) 
in Ivanov, p.\ 90, Theorem~3.

\end{enumerate}
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