#### Talks

- International Laboratory of Algebraic Topology and Its Applications, HSE, Moscow, May 2020

*High-Dimensional Expanders (online talk)*. - U of Neuchatel Colloquium, Apr 2020

postponed. - Geometry Graduate Colloquiumg, ETH Zurich, Mar 2020

postponed. - Zurich Graduate Colloquium, ETH Zurich, Apr 2020

postponed. - MPS Conference on High-Dimensional Expanders, Simons Foundation, NYC, Oct 2019

*The Vertex Shadow on the Edge Laplacian Spectrum.* - Joint Analysis & Combinatorics Seminar, U of Cologne, Oct 2019

*On the chromatic number of the hyperbolic plane.* - RANDOM 2019, MIT, Sep 2019

*Direct Sum Testing: the General Case*. - Joint Analysis & Combinatorics Seminar, Yale, Sep 2019

*Independent sets and spectral method*. - 2 lecture mini-course, U of Neuchatel, Jun 2019

*High-Dimensional Expanders*. - 2 lecture mini-course, U of Neuchatel, Mar 2019

*Spectral Methods on Graphs and Surfaces*. - goMath Flash Talks, ETH, Zürich, Mar 2019

*Tensor Product Testing*. - ETHZ Geometry Seminar, Zürich, Oct 2018

*Spectral Methods: from hyperbolic surfaces to graphs and back.* - Student Combinatorics Day at Bar-Ilan U, Ramat Gan, Jul 2018

*Tensor power testing.* - U of Haifa Algebra Seminar, Haifa, May 2018

*Density theorems and almost diameter in quotient spaces.* - Action Now Wandering Seminar, Technion, Haifa, May 2018

*Density theorems and almost diameter in quotient spaces.* - Conference on High Dimensional Combinatorics at IIAS, Jerusalem, April 2018

*On Colorings and Independence.*YouTube video - Bar-Ilan U Algebra Seminar, Ramat Gan, Jan 2018
*Cutoff on Hyperbolic Surfaces.* - Field Arithmetics Seminar at Tel-Aviv University, Tel-Aviv, Nov 2017

*Spectral Methods: from hyperbolic surfaces to graphs and back.* - Bar-Ilan U Combinatorics Seminar, Ramat Gan, Nov 2017

*Spectral Methods: from hyperbolic surfaces to graphs and back.* - Technion Algebra Seminar, Haifa, Nov 2017

*Spectral Methods: from hyperbolic surfaces to graphs and back.* - Adult mathematics around dessins d'enfants. International conference dedicated to the 65th anniversary of G.B. Shabat, Moscow, May 2017

*Chromatic numbers of Riemannian surfaces [in Russian].*Video. - Applied and Random Topology Seminar, Technion, Haifa, Dec 2016

*Spectral Bounds on the Chromatic Number and Expansion of a Hypergraph* - Amitsur Algebra Seminar,Hebrew U, Jerusalem, 21 Apr 2016

*Spectral approach to the chromatic number of a simplicial complex [Thesis Defense Lecture]* - Nathan Keller Evening Seminar, Bar-Ilan U, Ramat Gan, March 2016

*Spectral bounds on the chromatic number of graphs and hypergraphs.* - Bar-Ilan U Combinatorics Seminar, Ramat Gan, March 2016

*Mixing, Coloring and Expansion of Ramanujan Complexes.* - Technion Algebra Seminar, Haifa, Jan 2016

*Mixing, Coloring and Expansion of Ramanujan Complexes.* - Combinatorics Seminar at The Tel-Aviv University, Tel-Aviv, Dec 2015

*Simplicial Complexes of High Chromatic Number.* - Coloring Graphs Conference at Technion, Haifa, Jul 2015

*Ramanujan complexes: simplicial complexes of large chromatic number.* - Math Colloquium at the at Hebrew University, Jerusalem, May 2015

*On the chromatic number of a simplicial complex.*(Zuchovitsky Prize Lecture.) - Groups and Geometry Seminar at the University of Geneva, Geneva, Mar 2015

*The chromatic number of Ramanujan complexes.* - Combinatorics seminar at the Renyi Institute, Budapest, Oct 2013

*The chromatic number of a simplicial complex.* - Lomonosov-2012 at Moscow State University, Moscow, Apr 2012

*Commutative monoid structure o the set of Belyi functions of 3-regular toric dessins d'enfants.* - Lomonosov-2011 at Moscow State University, Moscow, Apr 2011

*Cayley graphs and problem of words in one class of finite groups.*(Prize for the best talk.) - Amitsur algebra seminar at The Hebrew University, Jerusalem, Oct 2010

*Cayley graphs and dessins d'enfants.* - Lomonosov-2010 at Moscow State University, Moscow, Apr 2010

*On duality of Cayley graphs and dessins d'enfants.* - 7th International Algebraic conference in Ukraine, Kharkov, Aug 2009

*Cayley graphs, dessins d'enfants and modular curves.*