Detour through Group Theory

To move ahead on the Kummer Class Formula, it is necessary to delve into Dirichlet Characters and L-Functions. Properly appreciating these ideas requires a solid understanding of cyclic groups.

I think that it makes sense at this point to take a break from Kummer's Class Formula and trace the development of group theory from the quadratic equation to Galois's famous proof.

Once I have gone into more detail about group theory and in particular, cyclic groups, I will resume the development of Kummer's Class Formula.