Number of Subgroups of Prime Power Order is Congruent to 1 modulo Prime
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Theorem
Let $G$ be a finite group whose order is $n$.
Let $p$ be a prime number such that $p^k$ is a divisor of $n$.
Then the number of subgroups of order $p^k$ is congruent to $1$ modulo $p$.
Proof
Sources
- 1971: Allan Clark: Elements of Abstract Algebra ... (previous) ... (next): Chapter $2$: The Sylow Theorems: $\S 59 \iota$