On Boundary -- Value Problems for the Laplacian in Boundedand in Unbounded Domains Withperforated Boundaries

In the paper we consider boundary -- value problems with rapidly alternating type of boundary conditions, including problems in domains with perforated boundaries. We present the classification of homogenized (limit) problems depending on the ratio of small parameters, which characterize the diameter of parts of the boundary with different types of boundary conditions or on the ratio of small parameters, which characterize the diameter and the distance between holes. Also we studied the analogue of the Helmholtz resonator for domains with perforated boundary.