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.