Extension of the Factorization Theory of M.M. Djrbashian

This chapter gives the extension of the part of M.M. Djrbashian’s factorization theory of functions meromorphic in the unit disc, which relates with the classes including R. Nevanlinna’s class N, up to an exhaustive theory of Riesz-type representations for all delta-subharmonic functions in \({\mathbb D}\) . The theory is constructed by a new, simplified method based on the one-to-one property of the M.M. Djrbashian operator \(L_\omega \) .