Abstract Algebra | Group of Units modulo n

We sketch a proof that the equivalence classes of integers which are relatively prime to n form a group. This group is called the group of units modulo n.

[PunmasterSTP]

Abstract? More like add that, to the list of phenomenal videos on YouTube. Thanks for sharing!

[georgesadler]

Professor Penn, thank you for a fantastic lecture on Groups of Units modulo n in classic Abstract Algebra/ Number Theory.

[caffeineiv]

Outstandingly clean and sharp communication. Thank you

[rizalpurnawan]

Please create a video proof that for n = 2, 4, p^k, 2p^k, (Z/nZ, ×) is cyclic.