abbrev
L21 ↗KummerAlgebra
ClassFieldTheory.KummerAlgebra
The Kummer algebra K[X] / (X^n - a). It remains canonical when the polynomial is reducible, so no root in a chosen closure is required.
Source context 2 commands
Surrounding namespaces, section variables, and local commands at this declaration.
namespace ClassFieldTheory
universe uLean source · statement
abbrev KummerAlgebra
(K : Type u) [Field K] (n : ℕ+) (a : Kˣ)