Sylow theorems
= Sylow theorems
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= Sylow theorem
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If $|G|=p^am$ with $p\nmid m$, then $G$ has subgroups of order $p^a$, every $p$-subgroup lies in one, and all such Sylow subgroups are conjugate. Their number satisfies $n_p\equiv1\pmod p$ and $n_p\mid m$.