# Groups Lecture 17

in which we explore conjugacy classes in $S_n$ and $A_n$, and prove that $A_5$ is simple.

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# Groups Lecture 17

in which we explore conjugacy classes in $S_n$ and $A_n$, and prove that $A_5$ is simple.

# Groups Lecture 16

in which we prove Cauchy’s theorem and revisit the symmetric groups.

# Groups Lecture 13

in which we start learning about group actions.