On the ideal class groups of some cyclotomic fields
On the ideal class groups of some cyclotomic fields
1. Introduction.Let K be the cyclotomic field of m-th roots of unity, and K+ its maximal real subfield.Let C(m), C+(m)denote the ideal class groups of K, K+ respectively.Let ] denote the auto- morphism of K, mapping each element in K to its complex-conju- gate.Let C-(m) denote the kernel of the …