Every finite abelian extension of ℚ is contained in a cyclotomic field ℚ(ζₙ). Abelian CFT over ℚ; generalization to CM fields (Kronecker Jugendtraum / Hilbert 12).
Every finite abelian extension of ℚ is contained in a cyclotomic field ℚ(ζₙ). Abelian CFT over ℚ; generalization to CM fields (Kronecker Jugendtraum / Hilbert 12).