Essential norms of weighted differentiation composition operators between Zygmund type spaces and Bloch type spaces


Amir H Sanatpour, Mostafa Hassanlou




We study boundedness of weighted differentiation composition operators D k ϕ,u between Zygmund type spaces Z α and Bloch type spaces B β. We also give essential norm estimates of such operators in different cases of k ∈ N and 0 < α, β < ∞. Applying our essential norm estimates, we get necessary and sufficient conditions for the compactness of these operators.