Equations and inequalities involving nonlinear operators General theory of linear operators Groups and semigroups of linear operators, their generalizations and applications Individual linear operators as elements of algebraic systems Integral, integro-differential, and pseudodifferential operators Linear spaces and algebras of operators Miscellaneous applications of operator theory Nonlinear operators and their properties Ordinary differential operators Other (nonclassical) types of operator theory Partial differential operators Special classes of linear operators