Radical subgroups of lattice ordered groups
Rational Lie Algebras and p-Isomorphisms of Nilpotent Groups and Homotopy Types.
Recognizability in the lattice of convex -subgroups of a lattice-ordered group
RECOGNIZABLE LANGUAGES AND FINITE SEMILATTICES OF GROUPS.
Representing lattices by homotopy groups of graphs
In this paper we represent every lattice by subgroups of free groups using the concept of the homotopy group of a graph.
Residually finite groups with nontrivial intersections of pairs of subgroups.