Hermite–Minkowski theorem
In mathematics, especially in algebraic number theory, the Hermite–Minkowski theorem states that for any integer N there are only finitely many number fields, i.e., finite field extensions K of the rational numbers Q, such that the discriminant of K/Q is at most N. The theorem is named after Charles Hermite and Hermann Minkowski. This theorem is a consequence of the estimate for the discriminant | d K | ≥ n n n !
Source: Wikipedia — Hermite–Minkowski theorem (CC BY-SA 4.0)