Ya. I. Belopolskaya

Explicitly solvable model for two-dimensional Helmholtz resonator with two close point-like windows is constructed. The model is based on the theory of self-adjoint extensions of symmetric operators. Limiting procedure is studied for the case where the distance between the windows tends to zero. A regularization is suggested.

Побудовано явно розв'язувану модель для двовимірного резонатора Гельмгольца з двома близькими точковими вікнами. Модель базується на теорії самоспряжених розширень симетричних операторів. Вивчено процедуру граничного переходу для випадку, коли відстань між вікнами прямує до нуля, та запропоновано регуляризацію.

We present solutions to some boundary value and initial-boundary value problems for the "wave" equation with the infinite dimensional L\'evy Laplacian $\Delta _L$ $$\frac{\partial^2 U(t,x)}{\partial t^2}=\Delta_LU(t,x)$$ in the Shilov class of functions.

We suggest a method to solve boundary and initial-boundary value problems for a class of nonlinear parabolic equations with the infinite dimensional L'evy Laplacian $\Delta _L$ $$f\Bigl(U(t,x),\frac{\partial U(t,x)}{\partial t},\Delta_LU(t,x)\Bigl)=0$$ in fundamental domains of a Hilbert space.

A Dirichlet form associated with the infinite dimensional symmetrized Levy-Laplace operator is constructed. It is shown that there exists a natural connection between this form and a Markov process. This correspondence is similar to that studied in a previous paper by the same authors for the non-symmetric Levy Laplacian.