Algorithms Mathematical models 78 Graph theory 18 Computational complexity 14 Computer simulation 12 Polynomials 12 Set theory 12 Approximation theory 10 Circular-arc graphs 8 Computational methods 8 Helly circular-arc graphs 8 Iterative methods 8 Parameter estimation 8 Problem solving 8 Quantum theory 8 Boundary value problems 6 Complexity 6 Differential equations 6 Diffusion 6 Inverse problems 6 Matrix algebra 6 Partial differential equations 6 Program processors 6 Time series analysis 6 algorithm 6 article 6 Algebra 4 Automata theory 4 Backwards verification 4 Boundary conditions 4