Functional Analysis and Applications Seminar 

29/06/2007, 15:15 — 16:15 — Room P3.10, Mathematics Building
Ana Paula Nolasco, Universidade de Aveiro

A Fredholm characterization for Wiener-Hopf-Hankel operators withsemi-almost periodic symbols

It will be presented a characterization of Fredholm and invertibility properties for Wiener-Hopf-Hankel operators with semi-almost periodic Fourier symbols and acting between $L^2$ Lebesgue spaces, based on the mean motions and geometric mean values of the almost periodic representatives of the Fourier symbols at minus and plus infinity. Additionally, a formula for the Fredholm index is derived, as well as some conditions for the invertibility of the operators.