(Selection)

• 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• (2009) Stenius's unpublished manuscript on paradoxes - (Invited seminar) {\AA}bo Akademi, Turku (FI).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).