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 Для участия в он-лайн семинаре напишите elena -dot- kreines @ gmail -dot- com
+**19.11.2025**
+Sergey Fomin  (University of Michigan), Incidence geometry and tiled surfaces
+We show that various classical theorems of linear incidence geometry, such as the theorems of Pappus, Desargues, Möbius, and so on, can be interpreted as special cases of a general result that involves a tiling of a closed oriented surface by quadrilateral tiles. This yields a general mechanism for producing new incidence theorems and generalizing and interpreting the known ones.
+**05.11.2025**
+Katie Waddle (University of Michigan), Spherical friezes
+A fundamental problem in spherical distance geometry aims to recover an $n$-tuple of points on a 2-sphere in $\mathbb{R}^3$, viewed up to oriented isometry, from $O(n)$ input measurements. This talk will discuss an algebraic solution using only the four arithmetic operations. We will show how a new type of frieze pattern can be employed to arrange the measurement data. These friezes exhibit glide symmetry and a version of the Laurent phenomenon.
 **15.10.2025**