Cyclotomic Polynomials and Primitive Roots of Unity

This video introduces Cyclotomic Polynomials and nth Primitive Roots of Unity,

#quadraticequations
#grouptheory
#congruency
#cubicpolynomial
#congruencemodulo
#cubicequation
#módulo1
#módulo
#modulusclasses
#legendre

[areaxi]

This was good but I am looking for more about the proof for that equation with the mobius function.

[vishalkulkarni]

In 15:37 -3 is congurent to 5 mod 8 and not 5 mod 4 right?

[PunmasterSTP]

Man, it's hard for me to wrap my brain around the concept of cyclotomic polynomials, but I do think your examples are helping!