Дата и място: вторник, 9 юни 2026 г., 13:00, зала 403, ИМИ-БАН. Лектор: Azur Đonlagić (Université Paris-Saclay Заглавие: Brauer-Manin Obstructions for Homogeneous Spaces Резюме: In this talk, we introduce Brauer-Manin obstructions to the Hasse principle and to weak/strong approximation of adelic points on varieties over a global field. We also define variants of these obstructions well-suited for the study of rational points on homogeneous spaces of affine algebraic groups. We then state the main questions considered in this theory and give an account of some developments, including the speaker's recent work. Finally, we present briefly the main tools and ideas used in the theory, such as arithmetic duality theorems, highlighting the difficulties which appear in positive characteristic. За допълнителна информация: https://icms.bg/brauer-manin-obstructions-for-homogeneous-spaces/ https://icms.bg/category/icms-seminar/

Поредната сбирка на Националния семинар по стохастика ще се проведе на 9 юни 2026 г. (вторник) от 14:00 часа в зала 503 на ИМИ - БАН. Доклад на тема Modified percolation models on lattice graphs ще изнесе Viktor Stoyanov (University of Warwick). Abstract: We consider modified percolation models on the first quadrant of Z^2 , where many of the key tools from standard percolation on Z^2 fail, such as translational invariance. I will begin by defining the standard percolation model on Z^d , giving an overview of what is known, and then give some results which we prove for the first quadrant of Z^2 . In the second part of the talk, I will discuss an anisotropic percolation model on the first quadrant, [...]