ULBUGentVUBSeminar on Incidence Geometry
Schedule

Tuesday 25 April 2017
ULB
14:30  17:30

Thursday 16 March 2017
Brussels (VUB, building D, room D3.10)
14:30  17:30

Thursday 15 December 2016
Ghent  S22  meeting room
13:45  17:00
 14:00  14:45 Bart De Bruyn (Ghent University)
A combinatorial characterization of extremal hexagons
 15:00  15:45 Narasimha Sastry (Indian Statistical Institute, Bangalore)
Ovoids in projective 3space over a field with an even number of elements
 16:00  16:45 Rieuwert Blok (Bowling Green State University)
3spherical CurtisTits groups

Thursday 17 November 2016
Brussels (ULB, building NO, room 2.NO.906)
13:45  16:45
 14:00  14:45 Geertrui Van de Voorde (Ghent University)
KMarcs
 15:00  15:45 Manuel Merida Angelo (Ghent University)
Automorphism groups of Deitmar schemes and trees
 16:00  16:45 Michele D'Adderio (Université Libre de Bruxelles)
The Sandpile model on K_{m,n} and the rank of its configurations

Thursday 13 October 2016
Ghent  S22  meeting room
13:45  16:45
13h45: Coffee and Tea.
 14:00  14:45 Jan De Beule (Vrije Universiteit Brussel)
(Extending) arcs of finite vector spaces
 15:00  15:45 Mark Pankov (University of Warmia and Mazury)
Geometric Transformations in Quantum Logic
 16:00  16:45 Dimitri Leemans (Université Libre de Bruxelles)
Highly symmetric polyhedra and finite simple groups

Tuesday 5 July 2011
Brussels (VUB, building G, room G.6.308)
14:15  17:15
Due to renovation works to the elevators between
buildings
F and G, it is not trivial to find the lecture room. In order to access
building G, you have to go to the far end of building G (coming from
the train station) and enter there. Then go to the 6th floor. There
you have to follow the corridor to the end before you reach the lecture
room.
HINT: room 308 is not the door between rooms 307 and 309.
If you come by car, you should ask for a parking bar code by email to
pcara@vub.ac.be
 14:15  15:00 Giuseppe Mazzuoccolo (Universitŕ di Modena e Reggio Emilia)
On the excessive index of a graph
 15:15  16:00 Alice Devillers (University of Western Australia)
Locally $s$arc transitive graphs with a regular normal star quotient
 16:15  17:00 John Bamberg (University of Western Australia)
Triple factorisations of groups and related geometries

Friday 6 May 2011
VUB  Building G  room G.6.308
14:15  17:15
Due to renovation works to the elevators between buildings F
and G, it is not trivial to find the lecture room. In order to access building G, you have to go to the far end of building G (coming
from the train station) and enter there. Then go to the 6th floor. There
you have to follow the corridor to the end before you reach the
lecture room. HINT: room 308 is not the door between
rooms 307 and 309.
General instructions for reaching the campus can be found here
If you come by car, you should ask for a parking bar code by
email to pcara@vub.ac.be

Friday 29 October 2010
Ghent  S25  Emmy Noether
14:00  16:50
 14:00  14:50 Valentina Pepe (Ghent)
On the algebraic variety V_{r,t}
 15:00  15:50 Dimitri Leemans (ULB)
Polytopes arising from almost simple groups
 16:00  16:50 Mark Mixer (Northeastern University and ULB)
Symmetries of polytopes of high rank and their medial layer graphs

Friday 21 May 2010
UGent, S25, Emmy Noether LT

Friday 30 April 2010
Brussels (ULB, building NO, room 2.NO.906)

Friday 12 March 2010
VUB (room G.1.020, building G, 1st floor, access via Esplanade)

Friday 24 April 2009
VUB
14:00  17:00

Friday 3 April 2009
Ghent, Emmy Noether LT
14:00  17:00

Friday 13 March 2009
ULB
14:00  17:00
 14:00  14:45 Frédéric Vanhove
An algebraic approach to partial spreads of Hermitian varieties
 15:00  15:45 Mathieu Carette
The (abstract) rank of Coxeter groups
Abstract: (joint work with Richard Weidmann) The rank of a finitely generated group G is the smallest cardinality for a generating set for G. We report on ongoing research seeking to determine the rank of some Coxeter groups. We will give some examples of Coxeter groups generated by less elements than the standard generating set, and discuss some classes of Coxeter groups that have rank equal to the cardinality of the standard generating set.
 16:00  16:45 Koen Struyve
$\Lambda$ buildings and base change problems

Friday 20 February 2009
Ghent, Emmy Noether LT
14:00  17:00

Friday 9 May 2008
VUB, Room 3.06
 14:00  14:45 Mathieu Carette (Universite Libre de Bruxelles)
The automorphism group of amalgams over finite groups
 15:00  15:45 Robert Rolland (Universite de la Mediterranee, AixMarseille II)
Some remarks on maximally nonlinear functions over
 16:00  16:45 Nicola Durante (Universita degli Studi di Napoli Federico II)
New partial quadrangle

Friday 11 April 2008
Ghent (Emmy Noether LT)
 14:00  14:45 Sandra Deschamps
Questions of Auslander and Milnor on affine actions and their generalizations
 15:00  15:45 Yves Edel
APN functions and their links to geometry
Click here for abstract.
 16:00  16:45 Dimitri Leemans
On computing subgroup lattices of sporadic groups using Magma

Friday 7 March 2008
ULB
 14:00  14:50 Ivan Landjev
Arcs and blocking sets in projective Hjelmslev planes
 15:00  15:50 Timothée Marquis
Angledeformations in Coxeter groups
 16:00  16:50 Alice Devillers
S_3involution graphs

Friday 8 February 2008
Ghent

Friday 4 May 2007
ULB, Room 2.NO.906
 14:00  14:50 PierreEmmanuel Caprace
In the neighbourhood of Euclidean geometry within the theory of buildings
 15:00  15:50 JeanLuc Michel
Coxeter chains of simplices and domino tilings
 16:00  16:50 Beukje Temmermans
Some restrictions on collineations of finite polygons.
Abstract: In this talk we consider automorphisms of finite generalized polygons. The main
goal is to generalize the existing restrictions on the number of fixed points
of collineations and polarities, also in projective planes. For instance, it is
well known that every polarity of a finite projective plane of order q, with q
not a square, has exactly q+1 fixed flags. We generalize this to all dualities,
using the notion of an absolute element, and we further generalize to
quadrangles and hexagons. This is achieved by generalizing a result of Benson.

Friday 20 April 2007
UGent, S22, Lecture room 7
 14:00  14:45 Dirk Oliver
On convex sets associated with certain metrics and permutations.
 15:00  15:45 Simon Huggenberger
Polar spaces and dual polar spaces of infinite rank.
 16:00  16:45 Hendrik Van Maldeghem
Regular actions on (affine) generalized polygons

Friday 9 March 2007
ULB, Room 2.NO.906
 14:00  14:50 Jan De Beule
On partial spreads of Hermitian varieties in odd dimension.
 15:00  15:50 Erik Postma
Lie algebras from PointLine Spaces
Abstract: We will investigate a construction of an algebra from an oriented
partial linear space. Sometimes this is a Lie algebra, sometimes
not. We determine the partial linear spaces where a Lie algebra can
be obtained. There are links to extraspecial 2groups and to
symplectic and orthogonal geometry.
 16:00  16:50 Guglielmo Lunardon
Nuclei of semifields
Click here for abstract.

Friday 16 February 2007
UGent, S22, Lecture room 7
 14:00  14:50 Michael Huber
Recent results on the classification of flagtransitive Steiner systems
Click here for abstract.
 15:00  15:50 Nicola Durante
Intersections of subgeometries of projective spaces.
Abstract: Let G and G' be two subgeometries of
order p^{s} and p^{t} respectively of PG(n,q), q=p^{h}. In this
talk we will present the possible intersection configurations between G and G'.
 16:00  16:50 Andreas Klein
On approximate inclusionexclusion
Click here for abstract.

Friday 19 May 2006
Ghent
NOTE.
At 16:30 the PhD defence of Miroslava Cimrakova (Mirka) of the Caagt research group (UGent) is scheduled in building S9 on the campus.
Title of the thesis: "Search algorithms in substructures of generalized quadrangles".
Everyone is cordially invited.
 14:00  14:50 Alessandro Siciliano (Potenza)
Some new twocharacter sets and their geometry.
 15:00  15:50 Aude Nguyen (ULB)
An existence criterion for Moufang buildings

Friday 31 March 2006
Brussels
This seminar will will not take place in the usual
room on the 9th floor of the maths building, but in the Solvay room on
the 5th floor of the same building, next to the elevators
 14:00  14:50 Andras Gacs (Budapest)
The direction problem in 3 dimensions and maximal partial ovoids of T_2(O).
 15:00  15:50 Mathieu Bogaerts (ULB)
Permutations arrays and isometries of Sym(n)
 16:00  16:50 Tim Mussche (TUE)
The chromatic number of the $q$Kneser graph

Friday 17 February 2006
Ghent (room 7)
14:00  16:00
 14:00  14:50 Markus Stroppel, Stuttgart
Using Klein's quadric in the classification of nilpotent Lie algebras
 15:00  15:50 Theo Grundhöfer, Wuerzburg
Defining the real numbers in terms of integers

Friday 9 December 2005
Ghent
 14:00  14:50 Barry Balof (Whitman College, Walla Walla; and ULB)
Geometric representations of partially ordered sets
 15:00  15:50 Bart De Bruyn (Ghent University)
Recent results on the classification of hyperplanes in dual polar spaces
 16:00  16:50 Edwin van Dam (Tilburg University)
A new family of distanceregular graphs with unbounded diameter

Wednesday 9 November 2005
Brussels (VUB, room D.2.16 = building D, 2nd floor, room 16)
 14:00  14:50 Cheryl Praeger (University of Western Australia, Perth)
Homogenious factorizations of graphs
 15:00  15:50 Alice Niemeyer (University of Western Australia, Perth)
Algorithms for finite groups
 16:00  16:50 Dimitri Leemans (ULB)
Atlases of polytopes
 Incidence geometry

