Shafarevich–Weil theorem
Relates fundamental classes of Galois extensions of fields to extensions of Galois groups / From Wikipedia, the free encyclopedia
In algebraic number theory, the Shafarevich–Weil theorem relates the fundamental class of a Galois extension of local or global fields to an extension of Galois groups. It was introduced by Shafarevich (1946) for local fields and by Weil (1951) for global fields.