- Beyond Sperner’s lemma.
October 10, 2017. Minor edits – October 15, 2017.
- Notes on the bounded cohomology theory.
August 3, 2017. Minor edits and the title change – August 17, 2017.
- The de Bruijn-Erdös-Hanani theorem.
May 12, 2017.
- The de Bruijn-Erdös theorem in incidence geometry via Ph. Hall’s marriage theorem.
April 12, 2017. Minor revisions – April 23, 2017.
- Elements of Torelli topology: II. The extension problem.
A major revision. The notions of admissible and peripheral diffeomorphisms from the first version are replaced by the new notion of weak Torelli diffeomorphisms.
April 4, 2017.
- The conformal dilatation and the Beltrami forms over quadratic fields extensions.
January 21, 2017.
- The geometric meaning of the complex dilatation.
November 12, 2016 and January 21, 2017 (a discussion of the action of real linear maps on the complex dilatation is added).
- A geometric interpretation of the complex dilatation.
December 21, 1995 and November 6, 2016 (reformatting and minor edits).
- Elements of Torelli topology: II. The extension problem. Version 1.
July 8, 2016. Uploaded September 5, 2016.
- Elements of Torelli topology: I. The rank of abelian subgroups.
June 24, 2016. Uploaded September 5, 2016.
- The Tutte expansion revisited.
March 10, 2016. Revised April 12, 2016.
- Algebra of linear recurrence relations in arbitrary characteristic.
Completely revised version of “An Algebraists’ View of the Linear Recurrence Relations”.
December 30, 2014.
Revised April 16, 2016: minor edits and new “Note bibiliographique”.
- Affine planes, ternary rings, and examples of non-Desarguesian planes.
October 8, 2014.
Revised April 15, 2016: minor edits.
- The virtual cohomology dimension of Teichmüller modular groups: the first results and a road not taken.
September 30, 2015.
- An English translation of A. N. Kolmogorov’s and Y. G. Sinai’s papers introducing entropy of dynamical systems.
May 2014. Uploaded May 17, 2015.
- An Algebraists’ View of the Linear Recurrence Relations, Version 2.
December 14, 2014.
- An Algebraists’ View of the Linear Recurrence Relations, Version 1.
September 20, 2014.
- (With Benson Farb) Torelli buildings and their automorphisms. October 9, 2014.
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