Remarks on Characters of Discrete Nilpotent Groups.
On a Non-Abelian Variety of Groups which are Symmetric Algebras.
Idempotent words in nilpotent groups
The automorphisms groups of symmetric algebras
Symmetric words in nilpotent groups of class ≤ 3
On a method of determining supports of Thoma's characters of discrete groups
We present a new approach to determining supports of extreme, normed by 1, positive definite class functions of discrete groups, i.e. characters in the sense of E. Thoma [8]. Any character of a group produces a unitary representation and thus a von Neumann algebra of linear operators with finite normal trace. We use a theorem of H. Umegaki [9] on the uniqueness of conditional expectation in finite von Neumann algebras. Some applications and examples are given.
On a problem of Bjarni Jónsson concerning automorphisms of a general algebra
Symmetric operations in groups
On Dye's condition in nilpotent groups of class 2
On weak automorphisms of algebras having a basis
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