1. ## Subgroups of S4

Find all the 3-Sylow subgroups of S4. I am having a real hard time getting the idea behind Sylow subgroups. Can someone help me with this please?

2. Originally Posted by nhk
Find all the 3-Sylow subgroups of S4. I am having a real hard time getting the idea behind Sylow subgroups. Can someone help me with this please?
I'll assume S4 as the symmetric group of degree 4.

The possible order of a 3-Sylow subgroup of $S_4$ should be 3, i.e., $3^1 \mid 24$ and $3^k \nmid 24$ for $k \geq 2$.

The order 3 subgroups of $S_4$ are simply the cyclic groups of order 3.

<(1 2 3)>, <(1 3 4)>, <(2 3 4)>, and <(1 2 4)>.

The number of 3-Sylow subgroups of $S_4$ is 4, which agrees to the third Sylow theorem, i.e., $4 \mid 24$ and $4=1\cdot3 + 1$.