Difference and Functional Equations 23 Functional equations Mathematics 20 Systems Theory, Control 7 Systems theory 7 Differentiable dynamical systems 6 Differential Equations 6 more ... Differential equations, partial 6 Dynamical Systems and Ergodic Theory 6 Ordinary Differential Equations 6 Mathematical optimization 5 Partial Differential Equations 5 Calculus of Variations and Optimal Control; Optimization 4 Functions of a Complex Variable 4 Functions of complex variables 4 Computational Mathematics and Numerical Analysis 3 Computer science 3 Distribution (Probability theory) 3 Numerical Analysis 3 Numerical analysis 3 Probability Theory and Stochastic Processes 3 Vibration 3 Vibration, Dynamical Systems, Control 3 Applications of Mathematics 2 Control 2 Engineering 2 Finance 2 Functional Analysis 2 Functional analysis 2 Functions, special 2 less ...