Describes abelian extensions of a (local or global) field K in terms of the multiplicative group K* / norms (local) or the idele class group 𝔸_K*/K* (global). Embodies the reciprocity law.
Describes abelian extensions of a (local or global) field K in terms of the multiplicative group K* / norms (local) or the idele class group 𝔸_K*/K* (global). Embodies the reciprocity law.