Mathematics 21 Differential equations, Partial 13 Mathematical analysis 11 Lie groups 10 Geometry, Differential 9 Mathematical models 9 Differentiable dynamical systems 8 Representations of groups 8 Linear algebraic groups 6 Operator algebras 6 Algebraic topology 5 Ergodic theory 5 Functional analysis 5 Homology theory 5 Spectral theory (Mathematics) 5 Approximation theory 4 Attractors (Mathematics) 4 Bifurcation theory 4 Boundary value problems 4 Differential equations 4 Differential equations, Elliptic 4 Differential equations, Nonlinear 4 Geometry, Algebraic 4 Invariants 4 Lie algebras 4 Low-dimensional topology 4 Measure theory 4 Operator theory 4 Pseudodifferential operators 4 Quantum groups 4