Mathematics 38 Mathematical physics 15 Mathematical Physics 13 Differential equations, Partial 10 Partial Differential Equations 10 Physics 10 Differential equations 9 Functional analysis 9 Ordinary Differential Equations 9 Functional Analysis 8 Probabilities 8 Probability Theory and Stochastic Processes 6 Dynamical Systems and Ergodic Theory 5 Dynamics 5 Ergodic theory 5 Numerical Analysis 5 Numerical analysis 5 Calculus of Variations and Optimal Control; Optimization 4 Calculus of variations 4 Graph theory 4 Mathematical optimization 4 Quantum Field Theories, String Theory 4 Quantum field theory 4 String models 4 Computer science 3 Condensed Matter Physics 3 Condensed matter 3 Difference and Functional Equations 3 Difference equations 3 Functional equations 3