Inner Semidirect Product Example: Dihedral Group

[@drpeyam]

Mu prime!!!!

[@nskeip]

Hi! Thanks for the video! There is one small detail I noticed. Seems like you proved that D lies in , and there should be a prove that lies in D as well. UPD: oh but... if r and s belong to D, this is obvious)))

[@maximpushkar91]

This videos helps me understand my algebra class! Thank you!

[@adityadwivedi4412]

Thanks man for doing algebra

[@mcqueen424]

He’s back !

[@dipenganguly2635]

Very nice explanation... Looking forward more videos from you...

[@erikestrella7240]

Super cool 😎

[@stepesh]

wonderful!

[@tomkerruish2982]

I'm surprised you didn't just use the general result that any subgroup of index 2 is automatically a normal subgroup. (Sketch of proof: if [G:H] = 2, then the only possible cosets of H are H and G - H, thus every left coset is a right coset, and so H is normal in G.) Of course, you know your audience better than I. Are you in Ma5, or were you able to skip even further to Ma120? (A.k.a Ma5!)