Conjugate of Cycle
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Theorem
Let $n \ge 1$ be a natural number.
Let $S_n$ be the symmetric group on $n$ letters.
Let $\pi, \sigma \in S_n$.
Let $\sigma$ be a cycle of length $k$.
Then the conjugate $\pi \sigma \pi^{-1}$ is a cycle of length $k$.
Proof
Follows directly from Conjugate Permutations have Same Cycle Type.
$\blacksquare$