C6 is not Isomorphic to S3
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Theorem
Let $C_6$ denote the cyclic group of order $6$.
Let $S_3$ denote the symmetric group on $3$ letters.
Then $C_6$ and $S_3$ are not isomorphic.
Proof
Note that both $C_6$ and $S_3$ are of order $6$.
From Cyclic Group is Abelian, $C_6$ is abelian.
From Symmetric Group is not Abelian, $S_6$ is not abelian.
From Isomorphism of Abelian Groups, if two groups are isomorphic, they are either both abelian or both not abelian.
Hence $C_6$ and $S_3$ are not isomorphic.
$\blacksquare$
Sources
- 1965: J.A. Green: Sets and Groups ... (previous) ... (next): $\S 7.3$. Isomorphism: Example $136$