
Lezingen
Lezingen op uitnodiging
 Point sets in AG(n,q) (not) determining certain directions. [slides] . Baer Colloquium June 2010,
Ghent, Belgium, 12th june 2010.
 Direction problems in affine spaces. First
joint Conference of the Belgian, Royal Spanish and Luxembourg Mathematical Societies, Liege, 567 june, 2012.
 Direction problems in affine spaces, related problems, and applications. [slides] . Academy Contact Forum Galois geometries and applications,
Brussels, 5 October 2012.
 Segre's lemma of tangents and linear MDS codes. [slides] Journées estivales de la méthode polynomiale, 2427 June 2013, Lille, France
 Tight sets in finite geometry. [slides] .
ALCOMA15 (15  20 March 2015, Banz, Duitsland
 On the (linear) MDS conjecture. [slides] .
Wandering colloquium Getaltheorie in het vlakke land  Arithméthique en plat pays. October 19, 2015, Gent, Belgium
 Arcs in vector spaces over finite fields (invited talk). slides. Combinatorics 2016 (30 May  04 June 2016, Maratea, Italy)
 On the (weak) cylinder conjecture.
[slides]
Finite Geometry Workshop 2017, Szeged,
Hongarije, 28 april  1 may, 2017.
 On the MDS conjecture. [slides] Academy Contact Forum Coding Theory and Cryptography VII, Brussel, 6 oktober 2017.
 Finite Geometry in GAP (invited lecture). slides. GAP in Algebraic Research (18  22 november 2018, Aachen, Duitsland)
Lezingen op internationale congressen en aan buitenlandse universiteiten
 Partial spreads of T_{2}(O).
[slides] .
18th British Combinatorial Conference
(26 july 2001, Brighton, Sussex, UK)
 The smallest minimal blocking sets of Q(6,q), q even.
[slides] . Combinatorics 2002, (28 june 2002, Maratea, Italy)
 On the smallest minimal blocking sets of Q(2n,q).
[slides] . Geometric and algebraic combinatorics 2002
(1116 august 2002, Oisterwijk, The Netherlands)
 An application of {δ(q+1),δ;n+1,q}minihypers on generalized quadrangles.
[slides] . Algebraic and combinatorial coding theory VIII
(814 september 2002, Tsarkoe Selo, Sint Petersburg, Russia)
 The smallest minimal blocking sets of Q(2n,q), for small odd q.
[slides] . EIDMA Symposium 2002 (2122 november 2002, Eindhoven, The Netherlands).
 The smallest minimal blocking sets of Q(2n,q), for small odd q.
[slides] . Finite geometries 2003
(1621 februrary, Irsee, Germany)
 Minimal tcovers and maximal partial tspreads of polar spaces.
[slides] .
19th British Combinatorial Conference
(26 july 2001; Bangor, UK)
 The smallest sets of points meeting all generators of H(2n,q^{2}), n ≥ 2.
[slides] . EIDMA Symposium 2003 (1314 november 2003, Eindhoven, The Netherlands).).
 The smallest sets of points meeting all generators of H(2n,q^{2}), n ≥ 2.
Workshop Blocking sets of projective and polar spaces. (2229 february 2004, Naples, Italy)
 The smallest minimal blocking sets of Q(2n,q), q odd prime. Seminar finite geometry,
Università degli Studi della Basilicata, Potenza, Italy, March 2nd, 2004).
 Minimal blocking sets of size q^{2}+2 of Q(4,q), q an odd prime,
do not exist. [slides] . Incidence Geometry (23  29 may 2004, La Roche, Belgium).
 The Hermitian variety H(5,4) has no ovoids.
[slides] . EIDMA Symposium 2004 (2526 november 2004, Eindhoven, The Netherlands).).
 On small minimal blocking sets of Q(4,q), q odd. EIDMA Seminar Combinatorial Theory,
Technische Universiteit Eindhoven, Eindhoven, The Netherlands, 16 march 2005
 The Hermitian variety H(5,4) has no ovoids.
[slides] . Algebraic Combinatorics and Applications (ALCOMA05)
(310 april 2005, Thurnau, Germany).
 Classification results on weighted minihypers.
[slides] . Fourth International Workshop on Optimal Codes and related topics
(1723 june 2005, Pamporovo, Bulgaria).
 The smallest minimal blocking sets of Q^{+}(2n+1,q), q=2,3,4.
[slides] . Geometric and algebraic combinatorics 2005
(1419 august 2005, Oisterwijk, The Netherlands)
 On maximal partial spreads of Hermitian varieties. Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 18th november 2005.
 Large maximal partial spreads of the Hermitian variety H(5,q^{2}).
Combinatorics 2006, (june 25 july 1st 2006, Ischia, Italy)
 Nonexistence of maximal partial ovoids of Q(4,q), q=p^{h}, h > 1.
[slides] . Finite geometries 2006
(1016 september, Irsee, Germany)
 Maximal partial ovoids and minimal blocking sets of generalized
quadrangles I, II and III. Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 17th november, 25th november and 1st december 2006.
 Algebraic techniques in finite geometry: a case study.
[slides] . Algebra seminar at UCD, Dublin, Ireland, januari 29th, 2007
 Characterization results on arbitrary (weighted) minihypers and on
linear codes meeting the Griesmer bound. [slides] . Seminar at Claude Shannon Institute, Claude Shannon Institute for Discrete Mathematics, Coding and
Cryptography, Dublin, Ireland, 31 januari 2007.
 Characterization of certain weighted tfold blocking sets, and an
application. [slides] .
Combinatorics 2008, (june 20  june 28, 2008, Costermano, Italy)
 Lower and upper bounds of maximal partial ovoids of orthogonal polar
spaces. [slides] . Geometric and algebraic combinatorics 2008
(1722 august 2008, Oisterwijk, The Netherlands)
 Particular facts about finite classical generalized quadrangels. Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 7th november 2008.
 Maximal partial ovoids of the generalized quadrangle Q(4,q).
[slides] .
22nd British Combinatorial Conference
(510 july 2009; St. Andrews, UK)
 (Partial) ovoids and (partial) movoids of Q^{}(5,q). Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 13th november 2009.
 Maximal partial ovoids of Q(4,q) of size q^{2}1: an update. Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 20th november 2009.
 On maximal partials spreads of the hermitian variety H(3,q^{2}).
[slides] . Algebraic Combinatorics and Applications (ALCOMA10)
(1118 april 2010, Thurnau, Germany).
 Small (n1)covers of the polar spaces Q^{+}(2n+1,q) and H(2n+1,q^{2}). Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 12th november 2010.

Some stability theorems in finite geometry. [slides] .
Graph theory seminar at UPC, UPC, Barcelona, Spain, 3rd march, 2011
 Maximal partial ovoids of Q(4,q), directions in AG(3,q) and subgroups of SL(2,q). Seminar Giessen, Giessen, may 2011.
 On the structure of the directions not determined by large affine point sets.
[slides] .
Finite geometries 2011
(1925 june, Irsee, Germany)
 FinInG  a share package for GAP.
[slides] .
Geometry Seminar Vicenza
(Decmeber 12, 2011)
 Old and new results on the MDSconjecture. [slides] Incidence Geometry and Buildings, 610 February 2012, Ghent, Belgium
 On CameronLiebler line classes with large parameter. [slides] Giornate di Geometria, 1314 February 2012, Vicenza, Italy
 On (recent) results towards the MDSconjecture. Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 13th april 2012.
 CameronLiebler line classes in PG(3,q). Seminar on finite geometries at Eötvös Loránd University,
Budapest, Hungary, 27th april 2012.
 Characterizing point sets in AG(3,q) from intersection numbers s. [slides] Combinatorics 2012, 915 September, Perugia, Italy
 On CameronLiebler line classes with large parameter. [slides] CanaDAM 2013 (Canadian conference on Discrete and Algorithmic Mathematics, 1016 June 2013, St. Johns, NL, Canada
 On CameronLiebler line classes with large parameter. Fq11 (The 11th International Conference on Finite Fields and their Applications), 2226 July 2013, Magdeburg, Germany
 Do itight sets and movoids hate each other? [slides] Workshop on Galois geometries and its applications, Pécs, , Hungary, 16 and 17 April 2014.
 FinInG: a share package for GAP. [slides] Finite geometries: Fourth Irsee Conference, 14  20 September 2014, Irsee, Duitsland
 Old and recent results on the linear MDS conjecture. [slides] Seminar on discrete mathematics, University of Zagreb. 24 April 2015, Zagreb, Croatia
 Strongly regular graphs and substructures of finite classical polar
spaces. [slides]
8th Slovenian Conference on Graph Theory
2127 juni 2015, Kranjska Gora, Slovenia
 Finite Incidence Geometry in GAP. [slides] Third GAP days, 13  23 September 2015, Trondheim, Norway
 Tight sets of Hermtian polar spaces. [slides] Workshop on Galois geometries and its applications, Pécs, Hungary, 5  9 May 2016.
 (Extending) arcs of vector spaces. Seminar on finite geometries at Eötvös Loránd University. Eötvös Loránd University, Budapest, Hungary, 16 September 2016.
 Blocking sets of Hall planes and value sets of polynomials over finite fields. [slides] The 13th International Conference on Finite Fields and their Applications. Gaeta, Italië, 4  10 juni, 2017.
 (Small) blocking sets of nonDesarguesian projective and affine planes. [slides] Finite Geometries 2017, 5th Irsee Conference Irsee, Duitsland, 10  16 september, 2017.
 On the MDS conjecture. COGENT seminar. Christchurch, Nieuw Zeeland, 21 maart, 2018. Linear sets in PG(1, q^{n}): how I learned to stop worrying and love polynomials. Combinatorics
2018 Arco, Italië, 4  9 juni, 2018
 Lower bound on the size of a linear set on a projective line Oberseminar Diskrete Strukturen [slides] Bayreuth, Duitsland, 12 september, 2018.
Lezingen op lokale seminaries
 On certain minimal blocking sets of Q(6,q), q even. UGentULBVUB seminar on Incidence Geometry. March 1st 2002, Ghent
 The smallest minimal blocking sets of Q(2n+2,q). UGent Seminar on Incidence Geometry. November 14th 2002, Ghent
 Minimal blocking sets of size q^{2}+2 of Q(4,q), q odd. UGent Seminar on Incidence Geometry. April 23rd 2004, Ghent
 On maximal partial spreads of H(5,q^{2}). UGent Seminar on Incidence Geometry. Januari 20th 2006, Ghent
 On maximal partial spreads of Hermitian varieties in odd dimension. UGentULBVUB seminar on Incidence Geometry. March 8th 2007, Brussels
 Existence and a characterisation of maximal partial ovoids of Q(4,q). UGent Seminar on Incidence Geometry. May 15th 2009, Ghent
 The polynomial method in Galois geometry. UGent Seminar on Incidence Geometry. January 28th 2011, Ghent
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