Keynote Speakers

Invited Speakers

And there will also be a 10 MINUTS section for students and PostDocs and a poster session!

Aim of the Conference

The conference on "Groups, Rings and associated structures 2019" will be held at Domain Sol Cress in the beautiful town of Spa, Belgium. It is a sequel to the meeting held in 2017. The international conference concentrates on recent developments in the areas of ring theory and group theory, with a focus on the interplay between these fields of mathematics, the methods involved in their study and applications to other areas. Some topics of interest are representations of groups and algebras, finitely presented algebras, group rings, unit groups and algebraic structures related to solutions of the Yang-Baxter equation.


There will be the opportunity for students and PostDocs to present a fascinating aspect of their research in a short freestyle lecture in the 10 MINUTS section: This stands for 10 Minutes of Interesting, New, UnTechnical Science.
The number of slots is limited and the deadline for applications was April 7th, 2019.

Poster session

There will be a poster session to which everybody can contribute. A unique Belgian price will be presented for the best poster.


The talks will begin early Monday morning, June 10th, and the last talk will be presented late afternoon on Friday, June 14th. Arrival is expected on Sunday June 9th and departure on Saturday June 15th.

If you have any questions please do not hesitate and write to us:

  • Note that due to an adaption of train schedules the last connection from Brussels Airport to Spa now departs already slightly earlier (20:02) on Sundays and public holidays.
  • The registration is open now.
  • A poster is available here.
  • Did you know that the English word "spa" derives its name from the town of Spa?
  • Definitions of spa (Noun):
    • A mineral spring considered to have health-giving properties.
    • A place or resort with a mineral spring.
    • A commercial establishment offering health and beauty treatment through such means as steam baths, exercise equipment, and massage.
  • Roudi Adnane (Rabat, Maroc)
  • Huda Ahmed (New York University, Abu Dhabi, United Arab Emirates)
  • Litegebe Alamirew (University of Gondar, Ethiopia)
  • Eli Aljadeff (Technion Institute of Technology, Israel)
  • Cesare Giulio Ardito (University of Manchester, UK)
  • Andreas Bächle (Vrije Universiteit Brussel, Belgium)
  • Sigiswald Barbier (Ghent University, Belgium)
  • Tamar Bar-On (Bar-Ilan University, Israel)
  • Tomer Bauer (Bar-Ilan University, Israel)
  • Guy Blachar (Bar-Ilan University, Israel)
  • Bernhard Böhmler (TU Kaiserslautern, Germany)
  • Charif Bourzik (University Cadi Ayyad, Morocco)
  • Tomasz Brzezinski (Swansea University, UK)
  • Julian Brough (Bergische Universität, Germany)
  • Sebastian Burciu (Romanian Academy, Romania)
  • Mauricio Caicedo (Vrije Universiteit Brussel, Belgium)
  • Andrea Caranti (University of Trento, Italy)
  • Karley Tatiana Cardona Echenique (UNAM, Mexico)
  • Marco Castelli (University of Salento, Italy)
  • Francesco Catino (University of Salento, Italy)
  • Stefan Catoiu (DePaul University, Chicago, USA)
  • Ferran Cedó (Universitat Autònoma de Barcelona, Spain, Spain)
  • Florion Cela (University of Tirana, Albania)
  • Deepshikha Chatterjee (Ambedkar University Delhi, India)
  • Eirini Chavli (University of Stuttgart, Germany)
  • Tiberiu Coconet (Babes-Bolyai, Romania)
  • Ilaria Colazzo (Università del Salento, Italy)
  • Tiago Cruz (Stuttgart University, Germany)
  • Juan Cuadra (University of Almería, Spain)
  • Dibyendu De (University of Kalyani, India)
  • Kenny De Commer (VUB, Belgium)
  • Luca M. Di Gravina (Università degli Studi di Milano-Bicocca, Italy)
  • Silvio Dolfi (Università degli Studi di Firenze, Italy)
  • Charles Eaton (University of Manchester, UK)
  • Florian Eisele (University of Glasgow, UK)
  • Susan El-Deken (Egypt)
  • Raghia El Hanine (University Cadi Ayyad, Morroco)
  • Wafaa Fakieh (King Abdulaziz University, Saudi Arabia)
  • Niamh Farrell (TU Kaiserslautern, Germany)
  • Islam Foniqi (University of Milano-Bicocca, Italy)
  • Matthias Floré (Vrije Universiteit Brussel, Belgium)
  • Àngel GarcÍa Blàzquez (University of Murcia, Spain)
  • Eugenio Giannelli (Università di Firenze, Italy)
  • Roman Gigoń (University of Bielsko-Biala, Poland)
  • Be'eri Greenfeld (Bar Ilan University, Israel)
  • Nicola Grittini (Università degli Studi di Firenze, Italy)
  • Johannes Hahn (Friedrich-Schiller-University Jena, Germany)
  • Fesal Hashem (University of Jordan, Jordan)
  • Ruwen Hollenbach (Technische Universität Kaiserslautern, Germany)
  • Waldemar Hołubowski (Silesian University of Technology, Gliwice, Poland)
  • Gilles Inghelbrecht (Vrije Universiteit Brussel, Belgium)
  • Natalia Iyudu (University of Edinburgh, UK)
  • Mehsin Jabel Atteya (University of Leicester, UK)
  • Andrei Jaikin-Zaipirain (Universidad Autónoma de Madrid, Spain)
  • Geoffrey Janssens (Vrije Universiteit Brussel, Belgium)
  • Přemysl Jedlička (Czech University of Life Sciences, Czech Republic)
  • Eric Jespers (Vrije Universiteit Brussel, Belgium)
  • Urban Jezernik (University of the Basque Country, Spain)
  • Zoe Karampatzaki (Vrije Universiteit Brussel, Belgium)
  • Kyriakos Katsamaktsis (University of Edinburgh, UK)
  • Surinder Kaur (Indian Institute of Technology Ropar, India)
  • Aaruni Kaushik (TU Kaiserslautern, Germany)
  • Radha Kessar (City, University of London, UK)
  • Ahmed Khammash (Umm Al-Qura University, Saudi Arabia)
  • Adnan Khan (National College of Business Administration & Economics, Lahore, Pakistan)
  • Ann Kiefer (Vrije Universiteit Brussel, Belgium)
  • Wolfgang Kimmerle (University of Stuttgart, Germany)
  • Philly Kimuli (Makerere University, Uganda)
  • Tamer Kosan (Gazi University, Turkey)
  • Shigeo Koshitani (Chiba University, Japan)
  • Łukasz Kubat (Vrije Universiteit Brussel, Belgium)
  • Burkhard Külshammer (Universität Jena, Germany)
  • Frieder Ladisch (University of Rostock, Germany)
  • Caroline Lassueur (TU Kaiserslautern, Germany)
  • Ivan Lau (University of Edinburgh, UK)
  • Victoria Lebed (Université de Caen Normandie, France)
  • Markus Linckelmann (City, University of London, UK)
  • Sai Praveen Madireddi (Central European University, Hungary)
  • Sugandha Maheshwary (Indian Institute of Science Education and Research Mohali, India)
  • Gunter Malle (Techinsche Universität Kaiserslautern, Germany)
  • Mohamed Mame (University of Nouakchott Al-Assriya, Mauritania)
  • Claudio Marchi (University of Manchester, UK)
  • Leo Margolis (Vrije Universiteit Brussel, Belgium)
  • Eliyahu Matzri (Bar-Ilan University, Israel)
  • Volodymyr Mazorchuk (Uppsala University, Sweden)
  • Marzia Mazzotta (Università del Salento, Italy)
  • Elliot Mckernon (University of Manchester, UK)
  • Anja Meyer (Georg-August University Göttingen, Germany)
  • Andrey Mikhovich (Lomonosov Moscow State University, Russia)
  • Diego Millan Berdasco (Queen Mary, University of London, UK)
  • Virgilius-Aurelian Minuță (Babeș-Bolyai University of Cluj-Napoca, Romania)
  • Hector Mommaerts (Belgium)
  • Hassan Mouadi (FST Mohammedia, Morroco)
  • Timur Nasybullov (KU Leuven, Belgium)
  • Shant Navasardyan (Yerevan State University, Armenia)
  • Bach Nguyen (Temple University, USA)
  • Trang Nguyen (Moscow Pedagogical State University, Russia)
  • Johan Öinert (Blekinge Tekniska Högskola, Sweden)
  • Jan Okniński (University of Warsaw, Poland)
  • Gabriela Olteanu (Babes-Bolyai University, Romania)
  • Mustafa Özdemir (Akdeniz University, Turkey)
  • Bregje Pauwels (University of Sydney, Australia)
  • Agata Pilitowska (Warsaw University of Technology, Poland)
  • Giuseppina Pinto (University of Salento, Italy)
  • Abraham Prins (Cape Peninsula University of Technology, South Africa)
  • Claudio Procesi (Università degli Studi di Roma, Italy)
  • Claudio Quadrelli (University of Milano-Bicocca, Italy)
  • David Riley (University of Western Ontario, Canada)
  • Ángel del Río (University of Murcia, Spain)
  • Noelia Rizo (University of Valencia, Spain)
  • Damiano Rossi (Bergische Universität Wuppertal, Germany)
  • Krishanu Roy (The Institute of Mathematical Sciences, Chennai, India)
  • Mallika Roy (Barcelona Graduate School of Mathematics-UPC, Spain)
  • Lucas Ruhstorfer (Bergische Universität Wuppertal, Germany)
  • Wolfgang Rump (University of Stuttgart, Germany)
  • Bernard Rybolowicz (Swansea University, Wales)
  • Subhrajyoti Saha (Monash University, Australia)
  • Mohamed Salim (UAEU, UAE)
  • Daniel Sánchez Ruiz (Instituto de Matemática y Ciencias Afines, Peru)
  • David Sánchez Ruiz (Instituto de Matemática y Ciencias Afines, Peru)
  • Ofir Schnabel (Ort Braude College, Israel)
  • Iuliia Semikina (University of Bonn, Germany)
  • Gurmail Singh (University of Regina, Canada)
  • Agata Smoktunowicz (University of Edinburgh, UK)
  • Britta Späth (Bergische Universität Wuppertal, Germany)
  • Špela Špenko (Vrije Universiteit Brussel, Belgium)
  • David Ssevviiri (Makerere University, Uganda)
  • Mima Stanojkovski (Bielefeld University, Germany)
  • Wei-Liang Sun (National Taiwan Normal University, Taiwan)
  • Peter Symonds (University of Manchester, UK)
  • Wenqing Tao (University of Hasselt, Belgium)
  • Mohammed Taous (Moulay Ismail university, Errachidia Morocco)
  • Doryan Temmerman (Vrije Universiteit Brussel, Belgium)
  • Joan Tent (University of Valencia, Spain)
  • Jasques Thevenaz (École Polytechnique Féderale de Lausanne, Switzerland)
  • Hamid Usefi (Memorial University, Canada)
  • Constantin-Cosmin Todea (Technical University Cluj-Napoca, Romania)
  • Carolina Vallejo (ICMAT, Madrid, Spain)
  • Arne Van Antwerpen (Vrije Universiteit Brussel, Belgium)
  • Michel Van den Bergh (FWO, University Hasselt, Belgium)
  • Karen Van Opdenbosch (Vrije Universiteit Brussel, Belgium)
  • Leandro Vendramin (University of Buenos Aires, Argentina)
  • Charlotte Verwimp (Vrije Universiteit Brussel, Belgium)
  • Uzi Vishne (Bar Ilan University, Israel)
  • Thomas Weigel (Università degli Studi di Milano-Bicocca, Italy)
  • Magdalena Wiertel (Univesity of Warsaw, Poland)
  • Tulay Yildirim (Gebze Technical University, Turkey)
  • Ahmad Yousefian Darani (University of Mohaghegh Ardabili, Iran)
  • Pavel Zalesskii (Universidade de Brasília, Brazil)
  • Anna Zamojska-Dzienio (Warsaw University of Technology, Poland)


Ferran Cedó (Universitat Autònoma de Barcelona, Spain)
Eric Jespers (Vrije Universiteit Brussel, Belgium)
Jan Okniński (Uniwersytet Warszawski, Poland)
Michel Van den Bergh (FWO, Universiteit Hasselt, Belgium)

Scientific committee

Eli Aljadeff (Technion, Israel - הטכניון)
Ferran Cedó (Universitat Autònoma de Barcelona, Spain)
Eric Jespers (Vrije Universiteit Brussel, Belgium)
Jan Okniński (Uniwersytet Warszawski, Poland)
Ángel del Río (Universidad de Murcia, Spain)
Špela Špenko (Vrije Universiteit Brussel and Université Libre de Bruxelles, Belgium)
Michel Van den Bergh (FWO and Universiteit Hasselt, Belgium)

local organizers

Andreas Bächle, Mauricio Caicedo, Geoffrey Janssens, Ann Kiefer, Łukasz Kubat, Leo Margolis, Doryan Temmerman, Arne Van Antwerpen, Charlotte Verwimp


There will be a conference fee of 50 Euro (reduced rate of 30 Euro for students and PhD students) payable upon arrival.
The registration is closed. In case you still want to participate, please just send an e-mail to

Event schedule

You can download the abstracts of all talks and posters at once in the abstract book below. A talk schedule is included on the last page and is also separately downloadable. There might still be some minor changes.

Abstract book (PDF)
Talk schedule (PDF)

Individual abstracts are available in the online schedule on the right. An updated, printed out version of the abstract book will be provided upon registration.

Skew braces and the Yang-Baxter equation Abstract
Lattices of blocks with cyclic defect Abstract
Quantifying residual finiteness in groups and algebras Abstract
11:30-11:40 Geoffrey Janssens
How can (modular) representation theorist help ring theory? Abstract
11:45-11:55 Leo Margolis
Blocks of defect 1 and units in integral group rings Abstract
12:00-12:10 Ann Kiefer
Property (FA) of the unit group of 2-by-2 matrices over an order in a quaternion algebra Abstract

On abelian subcategories of triangulated categories Abstract
Group rings and the RS property Abstract
15:30-15:40 Charlotte Verwimp
Skew lattices and set-theoretic solutions of the Yang-Baxter equation Abstract
15:45-15:55 Ivan Lau
From the YBE to the left braces Abstract
16:00-16:10 Tulay Yildirim
n−UJ Rings Abstract

TBA Abstract
Low-dimensional representations of finite orthogonal groups Abstract
Eirini Chavli
Proving six cases of the BMM trace conjecture through computational methods Abstract
Ilaria Colazzo
The solutions of the Yang-Baxter equation with finite order Abstract
Přemysl Jedlička, Agata Pilitowska, Anna Zamojska-Dzienio
Quasigroups and biracks Abstract
Kyriakos Katsamaktsis
Solutions to the reflection equation from the theory of braces Abstract
Ivan Philly Kimuli, Alex Samuel Bamunoba, David Ssevviiri
Morphic elements in regular near-rings Abstract
Annet Kyomuhangi, David Ssevviiri
The locally nil radical for modules over commutative rings Abstract
Marzia Mazzotta, Paola Stefanelli
New set-theoretical solutions of the pentagon equation Abstract
Virgilius-Aurelian Minută
Character triples and group graded equivalences Abstract
Gabriela Olteanu
On primitive idempotents of semisimple group algebras Abstract
Mustafa Özdemir
The Ring of Hybrid Numbers and Some Applications to Linear Algebra Abstract
Group Rings and Amalgamated Products: The (FA) Property Abstract
11:30-11:40 Cesare Giulio Ardito
Morita equivalence classes of blocks with defect group (C_2)^5 Abstract
11:45-11:55 Diego Millan Berdasco
A New Family of Decomposition Numbers of the Symmetric Group Abstract
12:00-12:10 Tiago Cruz
Some versions of SchurWeyl duality and respective strength over arbitrary commutative rings Abstract

12:00-12:10 Mauricio Caicedo
TBA Abstract

The twisted group ring isomorphism problem over fields Abstract
On torsion units of integral group rings – “post-ZC” Abstract
15:30-15:40 Iuliia Semikina
G-theory of group rings for finite groups Abstract
15:45-15:55 Sigiswald Barbier
The blocks of the periplectic Brauer algebra Abstract
16:00-16:10 Nicola Grittini
Character degrees in π-separable groups Abstract

Towards the McKay Conjecture and generalizations Abstract
Combinatorial solutions to the reflection equation Abstract
On characters of degree not divisible by two primes Abstract
11:00-11:10 Julian Brough
The Alperin-McKay conjecture for simple groups of type A Abstract
11:15-11:25 Lucas Ruhstorfer
Global local conjectures and the Bonnafé–Dat–Rouquier Morita equivalence Abstract
11:30-11:40 Noelia Rizo
Groups with few p 0 -character degrees Abstract

2-categories and 2-representations Abstract
On Brauer trees in blocks of finite groups of Lie type Abstract
On Lattice-Free Orbit Polytopes Abstract
Structure groups and structure racks of YBE solutions Abstract
11:30-11:40 Tomer Bauer
Prime monomial ideals of subsemigroup algebras of free nilpotent groups Abstract
11:45-11:55 Magdalena Wiertel
Structure and properties of Hecke–Kiselman monoids and algebras Abstract
12:00-12:10 Mehsin Jabel Atteya
New Types of Permuting n-Derivations of Semiprime Rings Abstract
12:15-12:25 Susan F. El-Deken
Special Classes of Homogeneous Semilocal Rings: Corner Rings Abstract

Some properties of the conjugacy class sizes of a finite group Abstract
On the structure monoid and algebra of left non-degenerate set-theoretic solutions to the Yang–Baxter equation Abstract
15:30-15:40 Łukasz Kubat
TBA Abstract
15:45-15:55 Subhrajyoti Saha
Skeleton groups and their isomorphism problem Abstract
16:00-16:10 Tamar Bar-On
The infinite tower of profinite completions Abstract

Structure groups Abstract
Perpetuants: a lost treasure Abstract
McKay correspondences of Brauer characters Abstract
Irrationality of quotient varieties Abstract
11:30-11:40 Gurmail Singh
Central Normalized Torsion Units of Integral RBAs and Group Rings Abstract
11:45-11:55 Wei-Liang Sun
The Multiplicative Jordan Decomposition in the Integral Group Ring Z[Q_8 × C_p] Abstract
12:00-12:10 Surinder Kaur
A note on normal complement problem for split metacyclic groups Abstract
12:15-12:25 Andreas Bächle
Local properties of cut groups Abstract

Generalisations of Weiss Abstract
Simple and projective representations of finite sets Abstract
15:30-15:40 Mallika Roy
Invertible binary algebras isotopic to a group or an abelian group Abstract
15:45-15:55 Islam Foniqi
On the rationality of growth series for Artin Groups Abstract
16:00-16:10 Shant Navasardyan
On Hypergroups and Unitary Hypergroups over a group Abstract

On homomorphisms of crossed products of locally indicable groups to division algebras Abstract


There is a limited number of rooms available in the conference center and these can be booked on a first come first served basis. Please register for the conference first. Afterwards you will receive contact details and instructions on how to book a room at the conference venue. The rates for full board are 90 Euro (double room for single use), 84 Euro (double room), 70 Euro (Triple, double room for triple use with extendable sofa) and 60 Euro (Quadruple) per person per day. It is important that the reservation for the accommodation is made via the e-mail address provided in the e-mail confirming your registration and not via or other websites.

Here are some links with interesting sites in Spa and its surroundings.

Here are some links with information about Belgium.


There is a railway station in the town of Spa. From the railway station "Spa" it is a (maximum) 10 minutes walk to the cable car which takes you to the thermal bath right next to the conference venue. There are hourly direct trains to Spa from the cities Pepinster, Verviers and Aachen (Germany). Note that the last connection in direction Spa leaves the big hubs already around 20:00, see the boxes next to this text for detailed information.
Taxi Jean-Yves in Spa can be reached at +32 495 772020.

Coordinates of the conference site:

Domain Sol Cress
Spaloumont 5
4900 Spa

On Sunday there is a connection each hour from Brussels Airport-Zaventem to Spa with two changes (in Leuven and at Verviers-Central), with a total duration of the journey being 2 hours. The last connection to Spa departs from the Airport at 20:02 on Saturday, Sunday and Public Holidays (and at 18:41 during weekdays). Later there are still some connections to Verviers-Central, from where a taxi can take you to Spa for about 50 Euros (the taxi company "centraltax" in Verviers can be reached via +32 87 333333 or +32 475 661387). For detailed information on train connections you can consult the webpage of the Belgian railway company SNCB=NMBS. The indicated comment "For this route you may need to buy two tickets." usually does not apply for this connection.
There are ticket counters and ticket machines at the station to buy tickets. Note however that it is not possible to obtain information on train connections from the ticket machines, so it might be helpful to have information on where to change the train already saved or printed out (this information is available from the above website of the Belgian railway company).
There is also an airport called 'Brussels South', which is located close to the city of Charleroi. Note that it is more difficult and it takes significantly longer to arrive from this airport to the conference site.

This is the terminal for Eurostar trains and Thalys trains.
The total duration of the journey to Spa is about 2 hours and 15 minutes. There is a connection each hour from Bruxelles-Midi to Spa with one change at Verviers-Central, the last one departing from Bruxelles-Midi at 19:56 on Saturdays, Sundays and Public Holidays and one hour earlier during weekdays. Later there are still some connections to Verviers-Central, from where a taxi can take you to Spa for about 50 Euros (the taxi company "centraltax" in Verviers can be reached via +32 87 333333 or +32 475 661387). For detailed information on train connections you can consult webpage of the Belgian railway company SNCB=NMBS. The indicated comment "For this route you may need to buy two tickets." usually does not apply for this connection.
There are ticket counters and ticket machines at the station to buy tickets. Note however that it is not possible to obtain information on train connections from the ticket machines, so it might be helpful to have information on where to change the train already saved or printed out (this information is available from the above website of the Belgian railway company).

There are six connections per day taking you in about 3h30 from Frankfurt Airport (departure at 8:31, 10:31, 12:43, 14:43, 16:43, 18:43) to Spa with only one change in Aachen and some others with more changes. See the website of Deutsche Bahn for more information.
There are ticket counters and ticket machines at the station to buy tickets.