Ideal class groups of cyclotomic number fields I, by Franz Lemmermeyer

This paper has appeared in Acta Arith. 72 (1995), no.4, 347-359, and so the dvi version has been removed. We derive some results on Hasse's unit index of CM-fields, and give algebraic proofs for some class number relations due to Masley, Metsankyla, and Louboutin.

Franz Lemmermeyer <>