All the pdf files referred to below are screen presentations of talks. The files are listed in the order opposite to the chronological one.
Warning: do not print the files. Each of them contains a huge number of pages (about 300). The pages next to each other are almost identical. Usually only one phrase or formula is added.
Disclaimers: Of course, each talk is not presented entirely on the screen. Thus a file sholud not be considered as a complete account of the talk. This is rather a skeleton around which the story evolved. For some talks, the file was prepared only for the first part of the talk.
  1. Tritangent circles to a generic curve a talk on a Ph.D. thesis of Yury Sobolev, George Washington University, September 22, 2015.
  2. Products of two symmetries of order two, Colloquium talk at Pennsylvania State University, September 16, 2015.
  3. Reflections on relations among reflections, a Bernoulli lecture, Lausanne, June 12, 2014.
  4. Hypergeometries, August 20, 2013.
  5. Elevating link homology and TQFT'es via infinite cyclic coverings, May 27, 2011.
  6. Nice spaces with bad reputations and political correctness of the mathematical language, May 20, 2011.
  7. Unrealized opportunities. Topological, quantum and categorification invariants in 4D, April 1, 2011, George Washington University.
  8. Link invariants a la Alexander module, a talk over an internet connection at Seminar on Vector and Tensor Analysis, Moscow State University, December 9, 2010.
  9. Tropical geometries and multifields, a colloquium talk at Mathematics Department, Stony Brook University, April 15, 2010.
  10. Complex tropical geometry, a talk at workshop Tropical Structures in Geometry and Physics, MSRI, November 30, 2009.
  11. Boundary Value Khovanov Homology, a talk at AMS 2009 Fall Southeastern Meeting Boca Raton, FL, October 30 - November 1, 2009.
  12. Variations on Arnold's Strangeness, a talk at AMS 2009 Fall Southeastern Meeting Boca Raton, FL, October 30 - November 1, 2009.
  13. Twisted acyclicity of circle and link signatures, a talk at workshop Invariants in Low-Dimensional Topology, Oberwolfach MFO
  14. Patchworking of algebraic varieties and tropical geometry, a talk on The Valley Geometry Seminar, University of Massachusetts, Amherst, February 8 2008.
  15. The 16th Hilbert problem, a story of mystery, mistakes and solution, a talk on Midlands Regional Meeting on Tropical Geometry, Loughborough, April 20, 2007.
  16. Spaces that are not spoken about (in Russian) Prostranstva, o kotoryx ne priniato govorit. A talk to Moscow Mathematical Society on December 26, 2006.
  17. Compliments to Bad Spaces, March 2007.
  18. Khovanov homology of framed and signed chord diagrams, December 2006.
  19. Curves encomplexed, October 2006.
  20. Linking lines, November 2006.