Problem solving 246 Algorithms 57 Mathematical models 54 Theorem proving 37 Boundary conditions 29 Graph theory 28 Polynomials 26 Approximation theory 23 Computational complexity 22 Eigenvalues and eigenfunctions 21 Algebra 20 Set theory 20 Differential equations 18 Nonlinear equations 18 Topology 17 Computer simulation 16 Mathematical operators 16 Quantum theory 16 Nonlinear systems 15 Functions 14 Numerical methods 14 Parameter estimation 14 Probability 13 Error analysis 12 Hamiltonians 12 Integer programming 12 Perturbation techniques 12 Complexity 11 Computational methods 11 Data structures 11