On ideal class groups of algebraic number fields
On ideal class groups of algebraic number fields
1. Introduction.Nagel [4] proved in 1922 that there exist infinitely many imaginary quadratic number fields with the class numbers divisible by a given natural number.Yamamoto [6] obtained a stronger result for quadratic fields and showed that the same holds also or real quadratic case.On the other hand, Nagel's theorem was …