Fourier approach to homogenization problems

Abstract

This article is divided into two chapters. The classical problem of homogenization of elliptic operators with periodically oscillating coe cients is revisited in the rst chapter. Following a Fourier approach, we discuss some of the basic issues of the subject: main convergence theorem, Bloch approximation, estimates on second order derivatives, correctors for the medium, and so on. The second chapter is devoted to the discussion of some non-classical behaviour of vibration problems of periodic structures.