The -local subgroups of the groups with a generalized finite element of order 2 or 4.
The Frattini Subgroup of Locally Free Groups.
The fundamental groups of subsets of closed surfaces inject into their first shape groups.
The genus problem for one-relator products of locally indicable groups.
The local finiteness of some groups generated by a conjugacy class of order 3 elements.
The rank of the factor-group modulo the hypercenter and the rank of the some hypocenter of a group
We compare the special rank of the factors of the upper central series and terms of the lower central series of a group. As a consequence we are able to show some generalizations of a theorem of Reinhold Baer.
The Residual Finiteness of Certain Amalgameted Free Products.
Tidy subgroups for commuting automorphisms of totally disconnected groups: An analogue of simultaneous triangularisation of matrices.
Totally inert groups