Contents

1. On fine gradings on central simple algebras
Eli Aljadeff, Darrell Haile, and Michael Natapov

2. On observable module categories
Nicolás Andruskiewitsch and Walter R. Ferrer Santos

3. Group gradings on integral group rings
Yuri A. Bahturin and Michael M. Parmenter

4. Profinite graphs – comparing notions
Gunther Bergauer and Wolfgang Herfort

5. Lie identities in symmetric elements in group rings: A survey
Osnel Broche Cristo and Manuel Ruiz Marín

6. Irreducible morphisms in subcategories
Gladys Chalom and Héctor Merklen

7. Bol loops with a unique nonidentity commutator/associator
Orin Chein and Edgar G. Goodaire

8. Weil representations of symplectic groups
Gerald Cliff and David McNeilly

9. Gradings and graded identities for the upper triangular matrices over an infinite field
Onofrio M. Di Vincenzo, Plamen Koshlukov, and Angela Valenti

10. Structure of some classes of repeated-root constacyclic codes over integers modulo 2m
Hai Q. Dinh

11. Units in noncommutative orders
Ann Dooms and Eric Jespers

12. Idempotents in group algebras and coding theory
Raul A. Ferraz, Valéria O. Luchetta, and César Polcino Milies

13. Finitely generated constants of free algebras
Vitor O. Ferreira and Lucia S.I. Murakami

14. Partial actions of groups on semiprime rings
Miguel Ferrero

15. Representations of affine Lie superalgebras
Vyacheslav Futorny

16. On algebras and superalgebras with linear codimension growth
Antonio Giambruno, Daniela La Mattina, and Paola Misso

17. On spectra of group rings of finite abelian groups
André Gimenez Bueno and Michael Dokuchaev

18. Wedderburn decomposition of small rational group algebras
Carmen Rosa Giraldo Vergara

19. Some questions on skewfields
Jairo Z. Gonçalves

20. On the role of rings and modules in algebraic coding theory
Marcus Greferath and Sergio R. López-Permouth

21. Semiperfect rings with T-nilpotent prime radical
Nadiya M. Gubareni and Vladimir V. Kirichenko

22. The structure of the baric algebras
Henrique Guzzo, Jr.

23. On torsion units of integral group rings of groups of small order
Christian Höfert and Wolfgang Kimmerle

24. On a conjecture of Zassenhaus for metacyclic groups
Stanley O. Juriaans and Sudarshan K. Sehgal

25. Nilpotent blocks revisited
Burkhard Külshammer

26. Decomposition of central units of integral group rings
Yuanlin Li and Michael M. Parmenter

27. Generic units in ZC
Zbigniew Marciniak and Sudarshan K. Sehgal

28. On quasi-Frobenius semigroup algebras
Boris V. Novikov

29. Twisted loop algebras and Galois cohomology
Arturo Pianzola

30. Presentation of the group of units of ZD−16
Antonio Pita and Ángel del Río

31. Engel theorem for Jordan superalgebras
Ivan Shestakov and Konstantin Okunev

32. A characterization of centre-by-finite subgroups of division algebras
Mazi Shirvani

33. Isomorphic rational group algebras
Ana Cristina Vieira and Guilherme Leal