"Lev Aronovich Saknovich was born on February 24, 1932 in Lugansk, Ukraine. ... This book is compiled on the occasion of his 80th birthday. It starts with a short biography and a list of his publications. ... a collection of research papers that will be of interest to the mathematcians and engineers ... ." (Adhemar Bultheel, euro-math-soc.eu, July, 2015)

• Editorial Introduction.- Part 1: Biographical Material and List of Publications of L.A. Sakhnovich.- L.A. Sakhnovich – Biography.- List of Publications of L.A. Sakhnovich.- L.A. Sakhnovich My Teachers and Studies.- Part 2: Reserach Papers.- D. Alpay, F. Colombo and I. Sabadini: Inner Product Spaces and Krein Spaces in the Quaternionic Setting.- D. Alpay, P. Jorgensen, I. Lewkowicz and I. Martziano: Infinite Product Representations for Kernels and Iterations of Functions.- Y. Arlinski˘ı and S. Hassi: Q-functions and Boundary Triplets of Nonnegative Operators.- S. Boiko, V. Dubovoy and A. Kheifets: On Some Special Cases of the Radon–Nikodym Theorem for Vector- and Operator-valued Measures.- A.E. Frazho, S. ter Horst and M.A. Kaashoek: State Space Formulas for a Suboptimal Rational Leech Problem II: Parametrization of All Solutions.- B. Fritzsche, B. Kirstein and C. Mädler: On a Simultaneous Approach to the Even and Odd Truncated Matricial Hamburger Moment Problems.- F. Gesztesy and R. Nichols: A Jost–Pais-type Reduction of (Modified) Fredholm Determinants for Semi-separable Operators in Infinite Dimensions.- K.A. Makarov and E. Tsekanovski˘i: On the Addition and Multiplication Theorems.- J. Rovnyak and L.A. Sakhnovich: On Indefinite Cases of Operator Identities Which Arise in Interpolation Theory. II.- A. Sakhnovich and L. Sakhnovich: Nonlinear Fokker–Planck Equation: Stability, Distance and the Corresponding Extremal Problem in the Spatially Inhomogeneous Case.