The Quasicentral Modulus Associated with a Class of Nonself-similar Fractals

We discuss an extension to Voiculescu’s formula for the quasicentral modulus of a tuple of commuting, self-adjoint operators with spectral measure absolutely continuous with respect to a generalized Hausdorff measure. These Hausdorff measures are defined by gauge functions which are not power functions and are supported on nonself-similar fractals.