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- E. JESPERS, S. K. SEHGAL
- 1996

In this paper a finite set of generators is given for a subgroup of finite index in the group of central units of the integral group ring of a finitely generated nilpotent group. In this paper we construct explicitly a finite set of generators for a subgroup of finite index in the centre Z(U(ZG)) of the unit group U(ZG) of the integral group ring ZG of a… (More)

In this article we construct free groups and subgroups of finite index in the unit group of the integral group ring of a finite non-abelian group G for which every non-linear irreducible complex representation is of degree 2 and with commutator subgroup G′ a central elementary abelian 2-group.

- Antonio Giambruno, E. Jespers
- IJAC
- 1998

- Eric Jespers, Manuel Ruiz
- 2005

We give an explicit and character-free construction of a complete set of orthogonal primitive idempotents of a rational group algebra of a finite nilpotent group and a full description of the Wedderburn decomposition of such algebras. An immediate consequence is a well-known result of Roquette on the Schur indices of the simple components of group algebras… (More)

- FERRAN CEDÓ, ERIC JESPERS
- 2008

In 1992 Drinfeld posed the question of finding the set-theoretic solutions of the Yang-Baxter equation. Recently, Gateva-Ivanova and Van den Bergh and Etingof, Schedler and Soloviev have shown a group-theoretical interpretation of involutive non-degenerate solutions. Namely, there is a oneto-one correspondence between involutive non-degenerate solutions on… (More)

- V A Bovdi, E Jespers, A B Konovalov
- 2006

We investigate the classical Zassenhaus conjecture for the normalized unit group of the integral group ring of the simple Janko group J1. As a consequence, for this group we confirm Kimmerle’s conjecture on prime graphs.

Let R be a commutative ring, G a group and RG its group ring. Let φ : RG → RG denote the R-linear extension of an involution φ defined on G. An element x in RG is said to be φantisymmetric if φ(x) = −x. A characterization is given of when the φ-antisymmetric elements of RG commute. This is a completion of earlier work. keywords: Involution; group ring;… (More)

- Eric Jespers, Antonio Pita, Ángel del Ŕio, Manuel Ruiz, Pavel Zalesski
- 2006

We classify the finite groups G such that the group of units of the integral group ring ZG has a subgroup of finite index which is a direct product of free-by-free groups. The investigations on the unit group ZG∗ of the integral group ring ZG of a finite group G have a long history and go back to work of Higman [11]. One of the fundamental problems that… (More)

- O. Broche Cristo, Eric Jespers, Manuel Ruiz, O. Broche, E. Jespers, M. Ruiz
- 2008

Let R be a commutative ring, G a group and RG its group ring. Let φσ : RG → RG denote the involution defined by φσ( ∑