251 Numerical analysis
251.1 Error analysis, Digital filters, Computer arithmetic
251.2 Function evaluation
251.3 Interpolation, Functional approximation
251.4 Linear algebra
251.5 Nonlinear equations, Functional equations
251.6 Numerical integration, Numerical differentiation
251.7 Ordinary differential equations, Partial differential equations
251.8 Integral equations
251.9 Parallel and distributed algorithms, High performance systems