M. Institute of Computational Mathematics RAS, 2004. - 196 s. This collection presents works performed within the framework of priority fundamental research of the Department of Mathematical Sciences of the Russian Academy of Sciences "Computational and information problems of solving large problems" in two directions. "Methods of solving problems of variational assimilation of observational data and control of complex systems" and "Matrix methods in integral and differential equations". The collection is designed for a wide range of researchers specializing in the field of numerical methods and the development of modern software.