Difference and Functional Equations Difference equations 26 Functional equations 26 Mathematics 24 Differential equations 11 Ordinary Differential Equations 11 Dynamics 6 Differential equations, Partial 5 Dynamical Systems and Ergodic Theory 5 Ergodic theory 5 Partial Differential Equations 5 Algebra 2 Automatic control 2 Biomathematics 2 Calculus of Variations and Optimal Control; Optimization 2 Calculus of variations 2 Calculus, Operational 2 Computer science 2 Functional Analysis 2 Functional analysis 2 Functions of a Complex Variable 2 Functions of complex variables 2 Global Analysis and Analysis on Manifolds 2 Global analysis (Mathematics) 2 Integral Transforms, Operational Calculus 2 Integral transforms 2 Manifolds (Mathematics) 2 Number Theory 2 Number theory 2 Operator Theory 2