# talks

### :: 2022

*From Aristotelian Diagrams to Logical Geometry.*Inaugural lecture as research professor of logic, Institute of Philosophy, Leuven (Belgium), November 10, 2022.*Leonardi.DB: A Database of Aristotelian Diagrams.*Logica Universalis Webinar series, online, October 19, 2022.*Deontic DMN: Representing Deontic Statements in DMN with Bitstring Semantics*(joint work with Wai Wong, Joost Vennekens and Walter Schaeken; talk presented by Wai Wong). DecisionCamp 2022: Business Rules and Decision Management Technologies, Berlin (Germany)/virtual, September 26 - 28, 2022.*How do**H**umans**R**eason**W**ith and**B**etween**' Obl**igatory**'**and '**P**ermitted'? An**E**xperimental**S**tudy of the**R**elationship**B**etween**D**eontic**T**erms*(joint work with Wai Wong, Joost Vennekens and Walter Schaeken; poster presented by Wai Wong). XPRAG 2022: the 9th Experimental Pragmatics Conference, Pavia (Italy), September 22 - 23, 2022.*From Aristotelian Diagrams to Logical Geometry*.**Invited inspirational talk**at the Graduate Symposium of Diagrams 2022: the 13th International Conference on the Theory and Application of Diagrams, Rome (Italy), September 17, 2022.*Aspect Shifting in Aristotelian Diagrams*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Diagrams 2022: the 13th International Conference on the Theory and Application of Diagrams, Rome (Italy), September 14 - 16, 2022.*From Euler Diagrams to Aristotelian Diagrams*(joint work with Hans Smessaert). Diagrams 2022: the 13th International Conference on the Theory and Application of Diagrams, Rome (Italy), September 14 - 16, 2022.*A Database of Aristotelian Diagrams: Empirical Foundations for Logical Geometry*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Diagrams 2022: the 13th International Conference on the Theory and Application of Diagrams, Rome (Italy), September 14 - 16, 2022.*Two Perspectives on Existential Import*. Square 2022: the 7th World Congress on the Square of Opposition, Leuven (Belgium), September 9 - 13, 2022.*On the Ubiquity of Symmetry in Logical Geometry*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Symmetry 2022: the 12th SIS-Symmetry Congress, Porto (Portugal), July 11 - 17, 2022.

*From Existential Import in Syllogistics**to Translations between Modal Logics.***Invited talk**at the Argument and Syllogism workshop, Santiago (Chile)/virtual, June 23, 2022.

### :: 2021

*On the Cognitive Potential of Derivative Meaning in Aristotelian Diagrams*(joint work with Hans Smessaert and Atsushi Shimojima; talk delivered by Hans Smessaert). Diagrams 2021: the 12th International Conference on the Theory and Application of Diagrams, online, September 28 - 30, 2021. (Virtual conference due to the Covid-19 pandemic.)*Schopenhauer's Partition Diagrams and Logical Geometry*(joint work with Jens Lemanski; talk delivered by Jens Lemanski). Diagrams 2021: the 12th International Conference on the Theory and Application of Diagrams, online, September 28 - 30, 2021. (Virtual conference due to the Covid-19 pandemic.)*Extending Knowledge Space Theory to Contingent Information with Bitstring Semantics*(joint work with Wai Wong, Walter Schaeken and Joost Vennekens; talk delivered by Wai Wong). MathPsych/ICCM 2021: Annual Joint Meeting of the Society for Mathematical Psychology and the International Conference on Cognitive Modeling, July 1 - 12, 2021. (Virtual conference due to the Covid-19 pandemic.)*The Modal Logic of John Fabri of Valenciennes (fl. c. 1500)*(joint work with Christophe Geudens; talk delivered by Christophe Geudens). Workshop: How to Investigate Student Notes from the Renaissance (ca. 1300-1600)?, Leuven (Belgium), May 20 - 21 and 27 - 28, 2021.*Boolean Considerations on John Buridan's Octagons of Oppositions*, Medieval Logic and Ontology (MeLO) seminar, Leuven (Belgium), March 26, 2021. (Virtual seminar due to the Covid-19 pandemic.)*Aristotelische diagrammen: eeuwenoud, springlevend [Aristotelian diagrams: centuries old, alive and kicking. The state of affairs in logical geometry]*, Lessen voor de eenentwintigste eeuw 2021 (studium generale program), Leuven (Belgium), March 8, 2021.

### :: 2020

*Using Multigraphs to Study the Interaction between Opposition, Implication and Duality Relations in Logical Squares*(joint work with Hans Smessaert). Diagrams 2020: the 11th International Conference on the Theory and Application of Diagrams, Talinn (Estonia), August 24 - 28, 2020. (Virtual conference due to the Covid-19 pandemic.)

*Free Rides in Logical Space Diagrams versus Aristotelian Diagrams*(joint work with Hans Smessaert and Atsushi Shimojima). Diagrams 2020: the 11th International Conference on the Theory and Application of Diagrams, Talinn (Estonia), August 24 - 28, 2020. (Virtual conference due to the Covid-19 pandemic.)**[Best Paper A****ward at****Diagrams 2020****!****]***The Logical Geometry of Knowability*. Fifth CLPS/DWMC Symposium on Analytic and Medieval Philosophy, Leuven (Belgium), May 29, 2020. (Event postponed due to the Covid-19 pandemic.)

### :: 2019

*Logical Geometry and Probability.*Brown bag talk at the Center for Logic and Philosophy of Science (CLPS), Leuven (Belgium), October 11, 2019.

### :: 2018

*A Guided Tour of Logical Geometry, Based on the Keynes-Johnson Octagon.***Invited****k****eynote talk**at Square 2018: the 6th World Congress on the Square of Opposition, Crete (Greece), November 1 - 5, 2018.*The Interplay between Aristotelian and Duality Relations in Four Octagons of Opposition*(joint work with Hans Smessaert; talk delivered by Hans Smessaert).*Aristotelian Diagrams for the Proportional Quantifier 'Most'*(joint work with Hans Smessaert; talk delivered by Hans Smessaert)*.*Square 2018: the 6th World Congress on the Square of Opposition, Crete (Greece), November 1 - 5, 2018.*Ordering Relations, Partitions and Aristotelian Diagrams*(joint work with Hans Smessaert). Logic Now and Then 4 (LNAT4), Brussels (Belgium), September 20, 2018.*Writing and Drawing in Logic - The Case of Aristotelian Diagrams.*Workshop on Practices of Writing and Reading in Logic, affiliated workshop of UNILOG 2018, Vichy (France), June 23 - 24, 2018.*Towards a Typology of Diagrams in Linguistics*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Diagrams 2018: the 10th International Conference on the Theory and Application of Diagrams, Edinburgh (UK), June 18 - 22, 2018.*Aristotelian and Duality Relations Beyond the Square of Opposition*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Diagrams 2018: the 10th International Conference on the Theory and Application of Diagrams, Edinburgh (UK), June 18 - 22, 2018.*Response to Nicolas Zaks, Plato on the Semantics of Negation in the Sophist (257b-c)*. Fourth CLPS/DWMC Symposium on Analytic and Medieval Philosophy, Leuven (Belgium), June 4, 2018.*The Role of Aristotelian Diagrams in Scientific Communication*. 8th Visual Learning Conference, Budapest (Hungary), April 26 - 28, 2018.*Aristotelian Diagrams: the Forgotten Icons of Logic*(joint work with Hans Smessaert). Workshop on Scholarly Forgetting in the Humanities, Helmstedt (Germany), April 19 - 21, 2018.*Response to Catarina Dutilh Novaes, Metaphors for Argumentation: A Social-Epistemological Approach*. Thursday Lectures, Leuven (Belgium), March 1, 2018.

### :: 2017

*The Logical Geometry of Russell's Theory of Definite Descriptions*. Poster presentation at the Fourth Philosophy of Language and Mind Conference (PLM4), Bochum (Germany), September 21 - 23, 2017.*The Logical Geometry of Russell's Theory of Definite Descriptions.*Research Colloquium 'Logic and Epistemology' of the Institut für Philosophie II, Bochum (Germany), July 13, 2017.*Duality and Lexicalization in Medieval Squares of Opposition*. Third CLAW/DWMC Symposium on Analytic and Medieval Philosophy, Leuven (Belgium), May 31, 2017.

### :: 2016

*The Logical Geometry of Russell's Theory of Definite Descriptions.*Research Seminar of the Center for Logic and Analytical Philosophy (CLAW), Leuven (Belgium), November 15, 2016.*The Interaction between Logic and Geometry in Aristotelian Diagrams*(joint work with Hans Smessaert). Diagrams 2016: the 9th International Conference on the Theory and Application of Diagrams, Philadelphia, PA (United States), August 7 - 10, 2016.*Visualising the Boolean Algebra B_4 in 3D*(joint work with Hans Smessaert). Poster presentation at Diagrams 2016: the 9th International Conference on the Theory and Application of Diagrams, Philadelphia, PA (United States), August 7 - 10, 2016.*The Continuity between Logic and Metalogic from the Perspective of Logical Geometry*.*Response to Mingyu Ma, Supposition and Reference.*Second CLAW/DWMC Symposium on Analytic and Medieval Philosophy, Leuven (Belgium), April 22, 2016.

### :: 2015

*Interactively Illustrating the Context-Sensitivity of Aristotelian Diagrams*. Ninth International and Interdisciplinary Conference on Modeling and Using Context (CONTEXT 2015), Larnaca (Cyprus), November 2 - 6, 2015.*Shape Heuristics in Aristotelian Diagrams*(joint work with Hans Smessaert). SHAPES 3.0, Larnaca (Cyprus), November 2, 2015.*Aristotelian Diagrams for Multi-Operator Formulas in Avicenna and Buridan*(joint work with Hans Smessaert). 15th Congress of Logic, Methodology and Philosophy of Science (CLMPS), Helsinki (Finland), August 3 - 8, 2015.*Metalogical Decorations of Logical Diagrams*(joint work with Hans Smessaert). 15th Congress of Logic, Methodology and Philosophy of Science (CLMPS), Helsinki (Finland), August 3 - 8, 2015.*Response to Luca Gili, Thomas Aquinas on Future Contingents.*First CLAW/DWMC Symposium on Analytic and Medieval Philosophy, Leuven (Belgium), May 22, 2015.*Buridan's and Avicenna's Aristotelian Diagrams for Combined Operators*. First CLAW/DWMC Symposium on Analytic and Medieval Philosophy, Leuven (Belgium), May 22, 2015.*One-Sided versus Two-Sided Readings of Many and Few*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Logic Now and Then 3 (LNAT3), Brussels (Belgium), February 5, 2015

### :: 2014

*A Unified Account of Aristotelian and Hasse Diagrams*. Fourth Young Researchers Days in Logic, Philosophy and History of Science (YRD 4), Brussels (Belgium), September 26 - 27, 2014.*Logical and Geometrical Complementarities between Aristotelian Diagrams*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Diagrams 2014: the 8th International Conference on the Theory and Application of Diagrams, Melbourne (Australia), July 28 - August 1, 2014.*The Relationship between Aristotelian and Hasse Diagrams*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Diagrams 2014: the 8th International Conference on the Theory and Application of Diagrams, Melbourne (Australia), July 28 - August 1, 2014.*Logical Geometries and Information in the Square of Oppositions and its Extensions.*Square 2014: the 4th World Congress on the Square of Opposition, Rome/Vatican (Italy), May 5 - 9, 2014.*Algebraic and Cognitive Aspects of Presenting Aristotelian Diagrams*(joint work with Hans Smessaert). Square 2014: the 4th World Congress on the Square of Opposition, Rome/Vatican (Italy), May 5 - 9, 2014.*The Unreasonable Effectiveness of Bitstrings in Logical Geometry*(joint work with Hans Smessaert; talk delivered by Hans Smessaert). Square 2014: the 4th World Congress on the Square of Opposition, Rome/Vatican (Italy), May 5 - 9, 2014.*A Unified Account of Aristotelian and Hasse Diagrams.*Fourth Philosophy Graduate Conference, Leuven (Belgium), March 28, 2014.*Logical Geometry: Platonic Representations of Aristotelian Logic*. Common Seminar of the Institute of Philosophy (HIW), Leuven (Belgium), March 26, 2014.*The Dynamics of Surprise.*Poster presentation at the second Day on Research in the Humanities and Social Sciences, Leuven (Belgium), March 12, 2014.

### :: 2013

*Neighborhood Semantics for Public Announcement Logic*. Congress on Logic and Philosophy of Science (CLPS 13), Ghent (Belgium), September 16 - 18, 2013.*Weak and Strong Interpretations of the Dynamic Turn in Epistemic Logic.*Third Philosophy Graduate Conference, Leuven (Belgium), March 22, 2013.

### :: 2012

*The Role of Information in Logical Geometry*(joint work with Hans Smessaert). Research Seminar of the Center for Logic and Analytical Philosophy (CLAW), Leuven (Belgium), November 23, 2012.*Surprise in Probabilistic Dynamic Epistemic Logic*. Logic and Interactive Rationality (LIRA) Workshop, ILLC, Amsterdam (the Netherlands), October 4, 2012.*Surprise in Probabilistic Dynamic Epistemic Logic*. Conference of the Reasoning Club, Brussels (Belgium), September 17 - 19, 2012.*Logical Omniscience and Structured Propositions*. Third Young Researchers Days in Logic, Philosophy and History of Science (YRD 3), Brussels (Belgium), September 3 - 4, 2012.*Algebraic Aspects of Duality Diagrams*. Poster presentation at Diagrams 2012: the 7th International Conference on the Theory and Application of Diagrams, Canterbury (UK), July 2 - 6, 2012.*Surprise in Probabilistic DEL*. 10th Conference on Logic and the Foundations of Game and Decision Theory (LOFT 2012), Sevilla (Spain), June 18 - 20, 2012.*The Role of Information in Logical Geometry*(joint work with Hans Smessaert). Informal workshop of the research groups on logical geometry and n-opposition theory, Leuven (Belgium), June 11, 2012.*Information in the Square of Oppositions*(joint work with Hans Smessaert). Trends in Logic XI, Bochum (Germany), June 3 - 5, 2012.*The Dynamics of Surprise*. Modal Logic workshop, Brussels (Belgium), May 8, 2012.*A Brief Overview of Logical Geometry*. PhDs in Logic IV, Ghent (Belgium), April 12 - 13, 2012.*Reduction Axioms in Dynamic Logics of Agency.*Second Philosophy Graduate Conference, Leuven (Belgium), March 23, 2012.

### :: 2011

*Group Theory and Duality Diagrams*. Logic Now and Then 2 (LNAT 2), Brussels (Belgium), December 21 - 22, 2011.*Logical Geometry: What, How, and Why?*Informal workshop of the research groups on logical geometry and n-opposition theory, Leuven (Belgium), November 11 - 12, 2011.*An Algebraic Perspective on Duality in Logic and Language.*Poster presentation at the first Day on Research in the Humanities and Social Sciences, Leuven (Belgium), November 10, 2011.*An Algebraic Perspective on Duality in Logic and Language.*Poster presentation at Semantics and Philosophy in Europe 4 (SPE 4), Bochum (Germany), September 26 - October 1, 2011.*Structures of Oppositions in Public Announcement Logic. And: Some Algebraic Remarks on Duality.*Symposium on the Logic of Opposition (affiliated symposium of CLMPS 14), Nancy (France), July 19 - 26, 2011.*Neighborhood Semantics for Dynamic Epistemic Logics*. 14th Congress of Logic, Methodology and Philosophy of Science (CLMPS), Nancy (France), July 19 - 26, 2011.*The Dynamic Turn in Epistemic Logic: A Philosophical Perspective*. First Philosophy Graduate Conference, Leuven (Belgium), April 1, 2011.*Epistemic Dynamics and Logical Omniscience.*Research Seminar in Logic and Language, TiLPS, Tilburg (the Netherlands), March 10, 2011.*Epistemic Dynamics and Logical Omniscience*. Research Seminar of the Center for Logic and Analytical Philosophy (CLAW), Leuven (Belgium), March 9, 2011.

### :: 2010

*The Use of Corpus Linguistics in the Philosophy of Mathematical Practice*(joint work with Benedikt Löwe and Bernhard Schröder). First International Meeting of the Association for the Philosophy of Mathematical Practice (APMP), Brussels (Belgium), December 9 - 11, 2010.*Narrative and Information. Logical and Philosophical Comments on Benedikt Löwe's 'Formal Models of Narrative'.*Third Workshop in the Philosophy of Information, Brussels (Belgium), November 18 - 19, 2010.*Agreeing to Disagree in Probabilistic Dynamic Epistemic Logic.*Research Seminar in Logic and Language, TiLPS, Tilburg (the Netherlands), October 28, 2010.*Contemporary Epistemic-Doxastic Logic and the Lockean Thesis*. Logic, Reasoning and Rationality (LRR 10), Ghent (Belgium), September 20 - 22, 2010.*Looking for the Right Notion of Epistemic Plausibility Model*. Second Young Researchers Days & Workshop on Logic, Philosophy and History of Science (YRD 2), Brussels (Belgium), September 6 - 7, 2010.*Some Remarks on the Model Theory of Epistemic Plausibility Models*. 9th Conference on Logic and the Foundations of Game and Decision Theory (LOFT 2010), Toulouse (France), July 5 - 7, 2010.*Reversed Squares of Opposition in PAL and DEL*. Square 2010: the 2nd World Congress on the Square of Opposition, Corte (France), June 17 - 20.*Formalizing Dynamic Probabilistic Agreement Theorems*. Research Seminar of the Formal Epistemology Project (FEP), Leuven (Belgium), June 1, 2010.*Agreeing to Disagree in Probabilistic DEL*. Logic and Interactive Rationality (LIRA) Workshop, ILLC, Amsterdam (the Netherlands), April 12, 2010.*Towards a Dynamics of Realistic Knowledge: Neighborhood Semantics for Public Announcement Logic*. VAF IV: Fourth Conference of the Dutch-Flemish Association for Analytic Philosophy, Leuven (Belgium), January 20 - 22, 2010.

### :: 2009

*''It is easy to see that...'' A corpus study of mathematical proof*. Logic Tea Colloquium, ILLC, Amsterdam (the Netherlands), April 21, 2009.