Talks
Invited seminar and colloquium talks
AIST 2020. October 15-16, 2020. On interpretability and similarity in concept based Machine Learning
Schloss Dagstuhl, September 16-18, 2020. Generalized attributes: A step in preprocessing.
LTG, Universität Bern, October 18, 2018. An Introduction to Formal Concept Analysis.
95. Ernst-Schröder Seminar. TU Darmstadt, February 17, 2018. Verallgemeinerte Merkmale.
95. Ernst-Schröder Kolloquium. TU Darmstadt, February 16, 2018. Kontextuelle Verallgemeinerung Boolescher Algebren.
CRAG-6. University of Bamenda, Cameroon. June 16-17, 2016. Formal Concept Analysis: An Introduction.
Séminaires - LSIS. Aix-Marseille Université. March 24, 2016. Valuations on Finite Lattices.
Semigroups, Languages and Algebras. Akita University, Japan. August 7-9, 2014: Valuations on Finite Lattices.
SSIU & WIUI 2014. April 7-11, 2014. Palacký University, Olomouc, Czech Republic:
Valuations on Finite Lattices.
An Axiomatization of Boolean Algebras.
TU Dresden, Germany. May 14, 2009. An axiomatization of Boolean algebras via dicomplementations.
Carleton University, Canada. March 18, 2009. Concept lattices and their use in data-mining.
Université du Québec en Outaouais, Canada. January 21, 2009. Discovering concepts and rules with Formal Concept Analysis (Découverte des concepts et règles d'associations à travers l'analyse formelle de concepts).
Concordia University, Canada. November 27, 2008. Discovering concepts and rules with Formal Concept Analysis.
University of Ottawa, Canada. October 23, 2008. Representing weakly dicomplemen-ted lattices.
TU Dresden, Germany. June 26, 2008. On the homomorphicity order of labeled posets.
Université du Québec en Outaouais, Canada. March 12, 2008. Formal Concept Analysis: algorithmic aspects.
Tampere University of Technology, Finland. November 13, 2007. Weak complementations in lattices.
TU Dresden, Germany. July 5, 2007. Prime ideal theorem for double Boolean algebras.
University of Bern, Switzerland. May 9, 2007. Axiom of choice and related concepts, hidden and unnecessary choice.
University of Bern, Switzerland. April 16, 2007. On some aspects of negation on concepts.
Napier University, School of Computing, Edinburgh, UK. October 25, 2005. Negation on formal concepts.
University of Novi Sad, Serbia. January 26, 2005. On some algebras related to contextual logic.
University of Bern, Switzerland. November 1, 2004. Contextual Concept Logic.
Palacky University, Olomouc, Czech Republic. October 21, 2003. Weakly dicomplemented lattices.
Talks at workshops and conferences
AAA78: 78th Workshop on General Algebra. June 11-14, 2009; Bern, Switzerland. Talk: An axiomatization of Boolean algebras via dicomplementations.
ICFCA 2009: International Conference on Formal Concept Analysis. May 21-24, 2009; Darmstadt, Germany. Talk: Algebraic operators for querying pattern bases.
UltraMath 2008: Applications of Ultrafilters and Ultraproducts in Mathematics. June 1-7, 2008; Pisa, Italy. Talk: Prime ideal theorem for weakly dicomplemented lattices.
LARIM Workshop 2008: Pattern Discovery (Data Mining) and Management. April 25, 2008; Gatineau, Quebec, Canada. Talk: Pattern manipulation in concept lattices.
LA Symposium: Foundations of Theoretical Computer Science: For New Computational View. January 28-30, 2008; Kyoto, Japan. Talk: Towards an approximation theory for concept lattices.
Swiss–South Africa joint seminar: Logic and Information. From Logic to Constructive Reasoning. January 22-25, 2007; Bern, Switzerland. Talk: Prime ideal theorem for double Boolean algebras.
ICFCA 2007: International Conference on Formal Concept Analysis. February 12-16, 2007; Clermont-Ferrand, France. Talk: On the MacNeille completion of weakly dicomplemented lattices.
AAA72: Conference on Lattice Theory. In honour of the 70th birthday of George Grätzer and E. Tamas Schmidt. June 6-9, 2006; Budapest, Hungary. Talk: Finite distributive weakly complemented lattices.
Conference on Applications of Algebra X. March 7-11, 2006; Zakopane, Poland. Boolean algebra extensions: an attribute exploration.
ICFCA 2006: International Conference on Formal Concept Analysis. February 13-17, 2006; Dresden, Germany. Talk: A note on negation: a pcs-completion of semilattices.
AAA71: 71st Workshop on General Algebra. February 9-12, 2006; Bedlewo, Poland. Talk: Prime ideal theorem for double Boolean algebras.
Summer School on General Algebra and Ordered Sets. September 4-10, 2005; Mala Moravka, Czech Republic. Talk: Completion of weakly dicomplemented lattices.
Algebraic and Topological Methods in Non-Classical Logics II. June 15-18, 2005; Barcelona, Spain. Talk: Prime Ideal Theorem for Weakly Dicomplemented Lattices.
ICFCA 2005: International Conference on Formal Concept Analysis. February 14-18, 2005; Lens, France. Talk: Which concept lattices are pseudocomplemented?
Logic and Deduction. November 24-25, 2004; Schloss Münchenwiler, Switzerland. Talk: Contextual concept logic. (Invited speaker)
DMV 2004: Annual conference of the German Union of Mathematicians. Mathematical logic section. September 12-17, 2004; Heidelberg, Germany. Talk: Negation in contextual logic.
AAA67: 67th Workshop on General Algebra. March 26-28, 2004; Potsdam, Germany. Talk: On the class of concept algebras.
Novi Sad Algebraic Conference. August 25-28, 2003; Serbia. Talk: Weakly dicomplemented lattices: an extension of Boolean algebras.
AAA66: 66th Workshop on General Algebra. June 19-22, 2003; Klagenfurt, Austria. Talk: Congruence of concept algebras.
AAA65: 65th Workshop on General Algebra. March 21-23, 2003; Potsdam, Germany. Talk: Weakly dicomplemented lattices and double p-algebras.
ECAI 2002: 15th European Conference on Artificial Intelligence. July 22-26, 2002; Lyon. International workshop on advances in Formal Concept Analysis for Knowledge discovery in databases. July 23, 2002; Lyon, France. Talk: Closure operators with cost functions.
AAA64: 64th Workshop on General Algebra. May 30, 2002 - June 2, 2002; Olomouc, Czech Republic. Talk: Weakly dicomplemented lattices.
AAA63: 63rd Workshop on General Algebra. February 22-24, 2002; Kaiserslautern, Germany. Talk: The varieties of dicomplemented lattices generated by chains.
AAA61: 61st Workshop on General Algebra. February 2- 4, 2001; Darmstadt, Germany. Talk: Dicomplemented lattices: a representation theorem.