Subgroups approximatively of finite index and wreath products.
Summary: In a group, we introduce a notion of subgroup approximatively of finite index, which extends the notion of groups approximable by finite groups. We deduce a characterization of (restricted, permutational) wreath products that are approximable by finite groups.
subgroups approximatively of finite index
limits of sequences of subgroups of finite index
scientific article; zbMATH DE number 6371841