On free subgroups of generalized triangle groups.
On invertor elements and finitely generated subgroups of groups acting on trees with inversions.
On Locallay Indicable Groups.
On prosolvable subgroups of profinite free products and some applications.
On the Conjugacy Problem in a Free Product with Commuting Subgroups.
On the cyclic subgroup separability of free products of two groups with amalgamated subgroup.
On the group of reduced identities of relatively free solvable groups.
On the Nielsen Method in Free Products with Amalgamated Subgroups.
On the subgroups of the Picard group.
On universal theories of metabelian groups and the Shmel'kin embedding.
On zero-symmetric nearrings with identity whose additive groups are simple
We investigate conditions on an infinite simple group in order to construct a zero-symmetric nearring with identity on it. Using the Higman-Neumann-Neumann extensions and Clay’s characterization, we obtain zero-symmetric nearrings with identity with the additive groups infinite simple groups. We also show that no zero-symmetric nearring with identity can have the symmetric group as its additive group.
Operator Algebras Associated with Free Products of Groups with Amalgamation.
Platonic triangles of groups.
Positive-definite kernels, length functions on groups and a noncommutative von Neumann inequality
Presentations of the Amalgamated Free Product of two Infinite Cycles.
Primitives in the Free Group on Two Generators.
Products of trees, lattices and simple groups.
Projectivities of free products
Quasipsherical knots with infinitely many ends.
Regular neighbourhoods and canonical decompositions for groups.