16:53
See qual review.
Note from Pete: a common technique on qual Algebra problems is extracting an index 2 subgroup using the Cayley action of \(G\) on itself. These are always normal, so if this exists, \(G\) can’t be simple unless it’s order 2.
See qual review.
Note from Pete: a common technique on qual Algebra problems is extracting an index 2 subgroup using the Cayley action of \(G\) on itself. These are always normal, so if this exists, \(G\) can’t be simple unless it’s order 2.