| NBSAN is a network of researchers in Scotland and Northern England with interests in semigroup theory and its applications. It is funded by grants from the London Mathematical Society and Edinburgh Mathematical Society, and organises around three meetings per year in different locations around the region. The main participant universities are Heriot-Watt, Manchester, St Andrews and York, but our activities are open to all interested researchers and we especially welcome participation by graduate students. |
The next NBSAN meeting will be held at the University of York on Wednesday 24th November 2010, organised by Victoria Gould. Please note that the schedule has been slightly revised: the current one is as follows:
11:30-12:15 (Roger Kirk Centre) | Early arrivers meet for lunch |
12:20-12:30 (Langwith L/047) | Welcome |
12:30-13:15 (Langwith L/047) | Alexei Vernitski (Essex) - Graphs to semigroups |
13:20-14:10 (Langwith L/N/002) | Maria Szendrei (Szeged) - Some results on almost factorisable semigroups |
14:15-14:35 (outside L/N/002) | Coffee and Tea |
14:35-15:25 (Langwith L/N/002) | Peter Jones (Marquette) - Varieties of P-restriction semigroups |
15:30-15:55 (Langwith L/N/002) | Bassima Afara (Heriot-Watt) - The Rees theorem and its generalizations |
16:00-16:30 (outside L/N/002) | Coffee and Tea |
16:30-17:30 (Langwith L/N/002) | Volodymyr Mazorchuk (Uppsala) - Kiselman type semigroups | 17:30 | Close, followed by early dinner. |
All talks are in Langwith College, but please note the change of room after the first talk. Here is some practical information on travelling to the University and the map of the Heslington Campus. After the meeting we will be going for an early dinner in the centre of York.
There are limited funds available to support the attendance costs of UK-based graduate students; if you are interested in claiming then please contact Mark Kambites in advance with an estimate of your costs. For all other enquiries about the York meeting please contact Victoria Gould.
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The sixth NBSAN meeting was held at the University of Manchester on Monday 26th July 2010. The speakers were:
Zur Izhakian (Bar Ilan) - Supertropical algebra |
Erzsi Dombi (Glasgow) - Automatic semigroup acts |
Rick Thomas (Leicester) - FA-presentable semigroups |
The fifth NBSAN meeting was held at the University of St Andrews on Friday 7th and Saturday 8th May 2010, organised by James Mitchell. Speakers were:
Andreas Distler (St Andrews) - How to store 10 semigroups in a bit |
James East (Sydney) - Generators and relations for monoids of block bijections and partitions |
Attila Egri-Nagy (Hertfordshire) - Coordinatizing finite permutation groups and transformations semigroups - computational considerations |
Victoria Gould (York) - Bisimple inverse semigroups as semigroups of quotients |
Zsofia Juhasz (Essex) - The smallest operation-compatible quasiorders containing Green's quasiorders |
Zak Mesyan (Ben Gurion) - Conjugation of injections by permutations |
Markus Pfeiffer (St Andrews) - Semigroups with easily solveable word problem |
Steve Pride (Glasgow) - On diagram groups |
Abdullahi Umar (Sultan Qaboos) - Some combinatorial properties of semigroups of partial transformations |
The fourth NBSAN meeting was held at the University of York on Wednesday 25th November 2009, organised by Victoria Gould. Speakers were:
Claire Cornock (York) - Structure theorems for proper restriction semigroups |
Nick Gilbert (Heriot-Watt) - Approaches to tiling semigroups |
Michael Hoffmann (Leicester) - Hyperbolic monoids |
Marianne Johnson (Manchester) - Tropical matrix algebra |
Jim Renshaw (Southampton) - Adequate transversals of abundant semigroups (abstract | slides) |
Lubna Shaheen (York) - Perfection for pomonoids |
The third NBSAN meeting was held on 23rd July 2009 at Heriot-Watt University in Edinburgh, organised by Mark Lawson. The speakers were:
Chris Eilbeck (Heriot-Watt) - Weierstrass arithmetic semigroups and algebraic curves |
Jennie Hansen (Heriot-Watt) - Using probability theory to study the full transformation monoid |
Peter Higgins (Essex) - Set products in transformation semigroups |
Stuart Margolis (Bar-Ilan) - On some monoids associated to Coxeter groups |
James Mitchell (St Andrews) - Generating uncountable transformation semigroups |
The second NBSAN meeting was held in St Andrews on 16th and 17th April 2009. The speakers were:
João Araújo (Lisbon) - Guess Who |
Alan Cain (Lisbon) - Automaton Semigroups |
Robert Gray (St Andrews) - Homotopical and Homological Finiteness Conditions of Monoids and their Subgroups |
Mark Kambites (Manchester) - Free Adequate Semigroups |
Vesna Kilibarda (Indiana Northwest) - Ends for Semigroups and Monoids |
Valdis Laan (Tartu) - Tensor Products and Preservation of Weighted Limits for S-posets |
Mark Lawson (Heriot-Watt, expository talk) - The Morita Theory of Regular Semigroups |
László Márki (Rényi Institute) - A Matrix Construction for certain Inverse Monoids with an Application in Universal Algebra |
The inaugural NBSAN meeting was held in York on 28th January 2009, and was dedicated to the memory of Professor Douglas Munn (1929-2008). The speakers were:
John Fountain (York, expository talk) - The Mathematical Work of Douglas Munn and its Influence |
Nik Ruskuc (St Andrews, open problem talk) - One Relation Semigroups |
Rebecca Noonan Heale (Heriot-Watt) - Green's Relations for Semigroup Graph Expansions |
Yann H. Peresse (St Andrews) - Generating Transformation Semigroups using Endomorphisms of Preorders, Graphs and Similarity Relations |
Pedro V. Silva (Porto) - The Generalized Conjugacy Problem for Virtually Free Groups |
Jorge Almeida (Porto) - The Mysteries of Free Profinite Semigroups: a Sneak Preview |