About maximal distance minimizers. What is it and why they are so good? Докладчик: Яна Теплицкая Дата: 03.09.2024 г. Час: 14:00 ч. Място: зала 256 Резюме  

Дата: 10.09.2024 г., 14:00 ч. Място: Зала 403, ИМИ - БАН Докладчик: Боаз Моерман (Утрехтски университет) Доклад: Generalized integral points and strong approximation Допълнителна информация: https://icms.bg/generalized-integral-points-and-strong-approximation-talk-by-boaz-moerman/ Резюме. The Chinese remainder theorem states that given coprime integers p_1, …, p_n and integers a_1, …, a_n, we can always find an integer m such that m \equiv a_i \mbox{ mod } p_i for all i. Similarly given distinct numbers x_1,…, x_n and y_1, …, y_n we can find a polynomial f such that f(x_i)=y_i. These statements are two instances of strong approximation for the affine line (over the integers \mathbb{Z} and the polynomials k over a field k). In this talk we will consider when an analogue of this holds for special subsets of \mathbb{Z} and […]

На 11.09.2024 г. от 14:00 ч. в зала 478 на ИМИ и онлайн в Zoom ще се състои поредната сбирка на семинара по Диференциални уравнения и математическа физика. Доклад на тема Wigner’s elementary systems in de Sitter spacetime ще изнесе Хамед Педжан. Абстракт. Quantum elementary systems are associated with (projective) unitary irreducible representations (UIRs) of the relativity group (or one of its covering groups). This foundational perspective was first introduced by Wigner in his seminal 1939 paper, within the framework of Einstein-Poincaré relativity. In this talk, building on Wigner's approach, we will briefly introduce the de Sitter relativity group, its representations, and outline the basics of constructing elementary systems within the global structure of de Sitter spacetime. Линка към Зуум стаята: Join Zoom Meeting […]

Subdiffusion-reaction systems: from microscopic random walk to the mesoscopic fractional PDE's Докладчик: проф. Сергей Федотов, ръководител на групата по приложна математика в университета на Манчестър Дата: 11.09.2024 г. Час: 14:00 ч. Място: зала 403 Резюме: An interesting feature of subdiffusion-reaction systems is the lack of a universal model for reactions in subdiffusive media. Consequently, the coarse-grained fractional subdiffusion-reaction equations depend on the specific details of the underlying microscopic random walk models. This complexity arises from the memory effects inherent in subdiffusive transport systems. Simply adding a reaction term to the transport equation can be physically inconsistent. Due to the memory effect, the subdiffusion process depends on the entire history of the system’s evolution making the diffusion and reaction processes inseparable.  

Поредната сбирка на СЕМИНАРА на секция "Математическо моделиране и числен анализ" ще се състои на  18.09.2024 (сряда), от 14:00 часа в зала 478 на Института по математика и информатика. Доклад на тема: Singular perturbation theory in epidemic modelling ще изнесе Sara Sottile (University of Bologna, Italy). Резюме: In real world scenarios, the natural phenomena usually evolve on time scales differing by various orders of magnitude. Such separation in time-scales can be found, for example, in the field of chemical oscillations , neuroscience , ecology or opinion/information spreading . In this context, Geometric Singular Perturbation Theory (GSPT) is a powerful analytical technique which fully exploits the underlying time-scale separation. Epidemiological models also provide a natural fit for these dynamics. Consider, for instance, models that incorporate […]

Поредната сбирка на семинара Дидактическо моделиране ще се проведе на 30.09.2024 г. от 14:30 ч. в зала 278 на ИМИ. Доклад на тема Подготовка на България за Младежката Балканска олимпиада по математика - материали и препоръки за ученици, учители и ръководители ще изнесe ас. Мирослав Маринов.