I'm working on the following question while studying for my qual. in Algebra: Suppose that $G$ is a finite group with $p+1$ Sylow $p$-subgroups. Show that if $P$ and $Q$ are distinct Sylow $p$-subgroups of $G$, then their intersection is a normal subgroup of $G$
There was a hint to show that $|P : P \cap Q| = p$, which I've established, but I'm unsure of how this helps. Do anyone have any suggestions?