Singularities of the inverses of Fredholm operators
Alexander G. Ramm · Proceedings of the Royal Society of Edinburgh Section A Mathematics · 1986
Synopsis Let B(k) be a linear bounded mapping of a Banach space X into a Banach space Y meromorphic in the parameter k on a connected domain of the complex plane. Under certain assumptions on B(k), more general than previously considered, the singularities of the inverse operator are described.