Spectrum and Singular Integrals on a New Weighted Function Space

We introduce a new function space that is much finer than the classical Lebesgue spaces,and investigate the continuity and the discontinuity of the Calder′on–Zygmund operators on the new weighted spaces. In order to identify the continuity of singular integrals, we prove an interpolation theorem on the new spaces and propose a concept of the spectrum of base functions.