Elements of finite order
Let
- Prove that
is a subgroup of . - Prove that every non-identity element of
has infinite order. - Characterize the elements of
when , where is the additive group of real numbers.
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Let $G$ be an abelian group and $G_T$ be the set of elements of finite order in $G$.
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\begin{enumerate}[label=(\alph*)]
\item Prove that $G_T$ is a subgroup of $G$.
\item Prove that every non-identity element of $G/G_T$ has infinite order.
\item Characterize the elements of $G_T$ when $G={\bf R}/{\bf Z}$, where ${\bf R}$ is the additive group of real numbers.
\end{enumerate}