Invited talks

Conference talks and colloquia

    • Polish groupoids and the classification of operator algebraic varieties, 2015 Winter CMS Meeting, Special Session on Descriptive set theory, December 2015;

    • The noncommutative Poulsen simplex (slides), 2015 Winter CMS Meeting, Special Session on Operator Algebras, December 2015;

    • Noncommutative simplices and the mathematics of quantum physics, Oliver Club (Department Colloquium), Cornell University, November 19th, 2015;

    • Polish groupoids and the classification problem for operator algebraic varieties, Logic Seminar, Cornell University, November 2015;

    • The Poulsen simplex and Fraïssé theory for metric structures, Workshop on Homogeneous Structures, November 2015, BIRS, Banff, Alberta, Canada;

    • Nonstandard methods in combinatorics, Claremont Colleges Colloquium (October 21st, 2015);

    • The noncommutative Poulsen simplex, 2015 West Coast Opeator Algebras Symposium, University of California at San Diego, October 2015;

    • The classification of multiplier algebras of operator algebraic varieties, Colloquium, Universidad Complutense de Madrid, June 2015;

    • Noncommutative analogs of the Gurarij Banach space (abstract, slides), 2015 Annual ASL Meeting, Special Session on Set Theory, University of Illinois at Urbana-Champaign, March 2015;

    • The complexity of classification problems in operator algebras, Joint Mathematics Meeting 2015, Special Session on Classification Problems in Operator Algebras -- San Antonio, January 2015;

    • Uniqueness, homogeneity, and universality of the noncommutative Gurarij space (abstract), Canadian Mathematical Society 2014 Winter Meeting, Special Session on Operator Algebras and Operator Theory, December 2014;

    • The classification problem for separable operator systems (abstract, slides), 12th East Coast Operator Algebras Symposium -- Fields Institute, October 2014;

    • Ehrenfeucht–Fraïssé games in the logic for metric structures, Workshop on Model Theory and C*-algebras -- University of Münster, July 2014;

    • Conjugacy and cocycle conjugacy of automorphisms of O_2 are not Borel (abstract, slides), Workshop on C*-algebras and Dynamical Systems -- Fields Institute, June 2014;

    • An invitation to sofic groups, Math Department Colloquium -- Boise State University, Boise, United States (April 22nd, 2014);

    • Borel complexity and automorphisms of C*-algebras (abstract, slides), Workshop on Set Theory -- Mathematical Research Institute of Oberwolfach, January 2014;

    • Gottschalk's surjunctivity conjecture (abstract), Arbeitsgemeinschaft: Sofic Entropy, Mathematical Research Institute of Oberwolfach, October 2013;

    • Unitary equivalence of automorphisms of C*-algebras (abstract, slides), 2013 North American Annual ASL Meeting -- University of Waterloo, May 2013;

    • Model theoretic reformulations of the Connes embedding problem (abstract), Workshop on sofic and hyperlinear groups and the Connes embedding conjecture, UFSC, Florianopolis, June 2013;

    • The complexity of the relation of unitary equivalence of automorphisms of separable C*-algebras (abstract), Workshop on C*-Algebras, Dynamics, and Classification -- Mathematical Research Institute of Oberwolfach, October 2012;

    • Continuous logic and sofic groups (abstract, slides), Workshop on Continuous Logic and Functional Analysis -- Institut Camille Jordan, Lyon, July 2012;

    • Nonclassifiability of automorphisms of C*-algebras up to unitary equivalence (abstract, slides), Worskhop on Descriptive Set Theory and Functional Analysis -- BIRS, June 2012;

    • Descriptive set theory and classification problems in C*-algebra theory (abstract, slides), NSF/CBMS Regional Conference in the Mathematical Sciences -- University of Louisiana at Lafayette, May 2012.

Minicourses

Invited participation to workshops

Seminar talks

    • The classification problem for extensions of C*-algebras, Logic Seminar, California Institute of Technology, December 2020;

    • Ulam stability and definability, Logic Seminar, Victoria University of Wellington, November 2020;

    • On solenoids and their complements, Operator Algebras and Noncommutative Geometry Seminar, University of Wollongong, August 2020;

    • On solenoids and their complements, Pure Mathematics Seminar, University of New South Wales, July 2020;

    • Nonstandard analysis and Diophantine equations, Caltech Logic Seminar, June 2019;

    • The noncommutative Poulsen simplex, Geometry and Analysis Seminar, University of Auckland, June 2018;

    • The complexity of the classification problem in ergodic theory, Functional Analysis Seminar, UCLA, March 2018;

    • Actions of rigid groups on C*-algebras, Analysis Seminar, University of Glasgow, January 2018;

    • The complexity of the classification problem in ergodic theory, Functional Analysis Seminar, University of California at San Diego, November 2017;

    • The complexity of the classification problem in ergodic theory (slides), Analysis Seminar, University of Glasgow, October 2017;

    • The complexity of the classification problem in ergodic theory, Logic Seminar, University of Illinois at Urbana-Champaign, September 2017;

    • Borel complexity and C*-dynamics, Intensive Research Program on Operator Algebras Weekly Seminar, CRM Barcelona, March 2017;

    • Noncommutative simplices, Wabash Modern Analysis Seminar, Wabash College, February 2017;

    • Cocycle superrigidity and group actions on C*-algebras, Operator Algebras Seminar, Purdue University, February 2017;

    • A game-theoretic approach to Hjorth's turbulence theory, Logic Seminar, California Institute of Technology (January 2017);

    • Universal objects and extreme amenability: where topological dynamics meets Ramsey theory, Logic Seminar, California Institute of Technology (November 29, 2016);

    • The omitting types theorem and the entropy realization problem, Logic Seminar, University of Turin (July 26, 2016);

    • Weak equivalence and the entropy realization problem, UCLA Functional Analysis Seminar, UCLA (March 2nd, 2016);

    • Weak equivalence for actions on the hyperfinite II_1 factor, UCSD (February 16th, 2016);

    • On the Erdős sumset conjecture, Combinatorics Seminar, Caltech (January 13th, 2016);

    • A functional analytic perspective on the Poulsen simplex, Functional Analysis seminar, University of Waterloo (December 13th, 2015);

    • Fraisse theory and the noncommutative Poulsen simplex, Caltech-UCLA logic seminar (October 9th 2015);

    • Fraïssé theory and universal objects in group theory and metric geometry, Geometry and Analysis on Groups Seminar -- University of Vienna (May 6th, 2015);

    • Borel complexity theory and Gromov's program, Geometry and Analysis on Groups Seminar -- University of Vienna (May 5th, 2015);

    • Operator system and operator space analogs of the Cuntz algebra. Operator Algebra Seminar --- University of Copenhagen (April 29th, 2015);

    • Generic spaces of operators, Séminaire de Logique --- Institut Camille Jordan, Lyon (March 31st, 2015);

    • A dichotomy for the complexity of the classification problem of automorphisms of C*-algebras, Descriptive Set Theory Seminar --- Université Paris 6 (February 17th, 2015);

    • Generic spaces of operators, Séminaire Général de Logique -- Université Paris 7 (February 16th, 2015);

    • An invitation to sofic groups, Geometric & Combinatorial Group Theory Seminar -- McGill University, Montreal (January 28th, 2015);

    • Polish groupoids and functorial complexity, Category Seminar -- McGill University, Montreal (January 27th, 2015);

    • The noncommutative Gurarij space (abstract), Logic Seminar -- University of Illinois at Chicago (November 18th, 2014):

    • The noncommutative Gurarij space and other Fraisse limits in functional analysis (abstract), Model Theory Seminar -- McMaster University, Hamilton, Ontario, Canada (October 28th, 2014);

    • Functorial complexity of Polish and analytic groupoids, Set Theory Seminar, Fields Institute (August 1st, 2014);

    • The Lopez-Escobar theorem for metric structures, and the topological Vaught conjecture, Toronto Set Theory Seminar, Fields Institute (May 23rd, 2014);

    • Conjugacy and cocycle conjugacy of automorphisms of O_2 are not Borel (abstract), Operator Algebras Seminar, Fields Institute (April 15th, 20114);

    • Borel complexity and automorphisms of C*-algebras (abstract, slides), Group Actions and Dynamics Seminar, University of Texas at Austin (March 5th, 2014);

    • The descriptive set theory of Polish groupoids, Set Theory Seminar, Fields Institute (December 13th, 2013);

    • The algebraic eigenvalues conjecture for sofic groups, Operator Algebras Seminar -- Fields Institute (October 29th, 2013);

    • Sofic and hyperlinear groups and the logic for metric structures (abstract), Geometry and Analysis on Groups Seminar -- University of Vienna (October 2nd, 2013);

    • The algebraic eigenvalues conjecture for sofic groups (abstract), Operator Algebras Seminar -- University of Copenhagen (September 18th, 2013);

    • Classification of automorphisms of operator algebras up to conjugacy (abstract), Seminar on Set Theory and Applications -- University of Copenhagen, Denmark (September 5th, 2013);

    • The automorphisms of a Jiang-Su stable C*-algebra are not classifiable up to conjugacy (abstract), Operator Algebras Seminar -- Fields Institute (August 8th, 2013);

    • Borel complexity of equivalence relations from operator algebras (abstract), Set Theory Seminar -- Fields Institute (May 3rd, 2013);

    • C*-algebras and omytting types (abstract), Seminar in operator theory and operator algebras -- University of Virginia, Charlottesville (March 5th, 2013);

    • The complexity of the relation of unitary equivalence for automorphisms of separable unital C*-algebras (abstract), Analysis Seminar -- University of Waterloo (October 19th, 2012);

    • The complexity of the relation of unitary equivalence for automorphisms of separable unital C*-algebras (abstract), Operator Algebras Seminar -- Fields Institute (October 16th, 2012);

    • La logica per strutture metriche ed il numero di gruppi sofici e iperlineari universali (abstract, slides) -- University of Turin, Italy (June 27th, 2012);

    • Turbulent actions on automorphism groups of C*-algebras (abstract), Operator Algebras Seminar -- Fields Institute (April 12th, 2012);

    • Nonstandard methods and additive combinatorics: effective estimates for Jin's theorem (abstract), Logic Seminars at Pisa -- University of Pisa (April 23rd, 2012);

    • On the number of universal sofic and hyperlinear groups (abstract, slides), LaWiNe Seminar -- University of Vienna (April 18th, 2012);

    • Ultraproducts in logic and group theory (abstract, slides), LaWiNe Seminar -- University of Vienna (April 18th, 2012);

    • Logic for metric structures and the number of universal sofic and hyperlinear groups (abstract), Set Theory Seminar -- Fields Institute (January 20th, 2012);

    • The Continuum Hypothesis and ultrapowers of C*-algebras and von Neumann algebras, Logic Seminars at Pisa -- University of Pisa (May 31st, 2011);

    • The structure theorem for unitary representations of amenable groups, Logic Seminars at Pisa -- University of Pisa (16th June, 2010).

Other talks and presentations

    • Groupoid Lp operator algebras (abstract, slides), Canadian Annual Symposium on Operator Algebras and Their Applications (June 26th, 2014);

    • An introduction to Fourier analysis and Roth's theorem (slides), AIM SQuaRE preparatory meeting (April 11th, 2013);

    • An introduction to Borel complexity of equivalence relations, University of Virginia, Charlottesville (March 8th, 2013);

    • Some nonstandard techniques in combinatorics (slides), AIM SQuaRE preparatory meeting (June 7th, 2012);

    • Classification of automorphisms of C*-algebras (abstract, slides), Canadian Operator Symposium 2012 -- Queen's University (May 24th, 2012)

Other workshop and conferences

    • LMS Research School "Combinatorics and Operators in Quantum Information Theory", Queen's University Belfast, September 5-9, 2016;

    • Measured Group Theory, August 29 - September 2, 2016, MFO, Oberwolfach, Germany;

    • C*-algebras, August 22-26, 2016, MFO, Oberwolfach, Germany;

    • Dynamics and C*-Algebras: Amenability and Soficity, October 20-24, 2014, BIRS, Banff, Alberta, Canada;