Group of Order 15 has Cyclic Subgroups of Order 3 and Order 5
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Theorem
Let $G$ be a group whose order is $15$.
Then $G$ has
and:
Proof
Let $G$ be a group of order $15$.
We have that $15 = 3 \times 5$.
Thus from the First Sylow Theorem:
and:
From Prime Group is Cyclic, all such subgroups of order $3$ and order $5$ are cyclic.
$\blacksquare$
Sources
- 1996: John F. Humphreys: A Course in Group Theory ... (previous) ... (next): Chapter $11$: The Sylow Theorems: Example $11.5$