A. E. Mironov. Integrable Birkhoff billiards.

After the talk D. N. Zaporozhets will report on the plans of the St. Petersburg Mathematical Society.

No meetings are planned for the near future: summer holidays

R. L. Frank. Direct and inverse scattering for the continuum Calogero-Moser equation.

    The CCM equation (also known as Calogero–Moser derivative nonlinear Schrödinger equation) is a nonlinear dispersive equation in 1+1 dimensions that is completely integrable. The corresponding Lax operator is a first order operator in the Hardy space on the real line. We develop a spectral theory of this operator, building Jost solutions, proving absence of singularly continuous spectrum and introducing scattering coefficients. We also prove trace formulas of Birman-Krein and Faddeev-Zakharov type. Finally, we propose an inverse scattering scheme for the solution of the CCM equation. The talk does not assume any previous knowledge of the CCM equation. It is based on joint work with Larry Read.

Video

A. V. Kolesnikov. Гипотеза Бургейна о гиперплоскости

A. K. Stavrova. Проста ли простая алгебраическая группа?