8-ranks of Class Groups of Some Imaginary Quadratic Number Fields

8-Ranks of Class Groups of Imaginary Quadratic Number Fields and Their Densities

“…It is a classical topic to study the structure of 2-primary subgroups of the narrow class groups C + (F ) for quadratic number fields F ( [1,2,3,9,12,13,14]). Gerth gave a method to compute their densities ( [4,5,6,15,16]).…”