Operator Functions and Localization of Spectra Operator Functions and Localization of Spectra is the first book that presents a systematic exposition of bounds for the spectra of various linear nonself adjoint operators in a Hilbert space having discrete and continuous spectra. In particular bounds for the spectra of integral differential and integro differential operators as well as finite and infinite matrices are established. The&nbsp;volume also presents a systematic exposition of estimates for norms of operator valued functions and their applications