Counting subgroups of the groups ${\mathbb{Z}}_{n_1}\times \cdots \times {\mathbb{Z}}_{n_k}$: a survey

László Tóth

We present a survey of exact and asymptotic formulas on the number of cyclic subgroups and total number of subgroups of the groups ${\Bbb Z}_{n_1} \times \cdots \times {\Bbb Z}_{n_…