[2020] Intuitionism without intuition: Against the phenomenological account, Midwest PhilMath Workshop – University of Notre Dame October 14 – December 9, 2020
[2017] Mathematical evidence. Invited talk at the Institute of Philosophy of the Czech Academy of Sciences, Prague. (21/02/ 2017)
[2017] Can there be vague metalanguages? Invited talk at the Institute of Philosophy of the Czech Academy of Sciences, Prague. (22/02/2017)
[2016] Le discours mathématique et le problème de la pluralité des sens (Invited talk) Festival de Philosophie 2016, Université Jean Moulin Lyon 3 (France) - October 2016
[2013] Identity and Boundarylessness, University of Lille 3 (FR)
[2011] Vague metalanguages - (Invited seminar) University of Venice (IT).
[2011] On mathematical evidence - (Invited seminar) University of Venice (IT).
[2010] Proof and evidence - (Invited seminar) University of Lille 3 (FR).
[2010] Counting, intuitionistically - Department of Philosophy, University of Helsinki (FI).
[2010] Formalized Proofs and Evidence - Conference: Two Streams in the Philosophy of Mathematics: Rival Conceptions of Mathematical Proof, University of Hertfordshire (UK).
[2009] Stenius's unpublished manuscript on paradoxes - (Invited seminar) Åbo Akademi, Turku (FI).
[2009] Mathematical objects and intuition of mathematical objects: some basic problems for the phenomenological account -Conference NoSP 09, University of Tampere (FI).
[2009] Mathematical evidence and the priority thesis - VAF Conference, Tilburg (NL).
[2008] Stenius on Antinomies - Department of Philosophy, University of Helsinki (FI).
[2008] Can there be vague metalangues? (Invited) Vagueness Workshop, Charmey (CH).
[2006] The intuitionistic continuum - (Invited) Archives Poincaré, University of Nancy 2 (FR).
[2005] Brouwer and Heyting on countable sets - AILA Meeting, Pisa (IT).
[2004] On the philosophy of intuitionistic mathematics - Logic Colloquium 2004. Turin (IT).
[2004] Vague concepts, Conference Logica 2004 (CZ).
[2004] Being a mathematical object - (Invited seminar) Intuitionistic Mathematics Seminar, Dept. of Mathematics, Univ. of Nijmegen (NL).
[2004] On the possibility of classifying color predicates without setting boundaries - (Invited) Dept. of Philosophy, Univ. of Nijmegen (NL).
[2004] On the philosophy of intuitionistic mathematics - (Invited) General Mathematical Colloquium, Dept. of Mathematics, Univ. of Nijmegen (NL).
[2003] On the nature and sources of vagueness - (Invited seminar) Dept. of Philosophy, Univ. of Helsinki (FI)
[2003] Boundarylessness: on vagueness from within - (Invited) Dept. of Philosophy, Univ. of Genoa (IT).
[2003] Rethinking enumerability - Conference Logica 2003, Kravsko Chateau (CZ).
[2003] On some difficulties concerning the intuitionistic definition of enumerability - (Invited) Dept. of Mathematics Univ. of Nijmegen (NL).
[2002] On counting and continuity - Third Annual Midwest Philosophy of Mathematics Workshop, Univ. of Notre Dame (USA).
[2002] On the concept of countable spread - Logic Colloquium 2002, Münster (D).