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
252 Metatheory, Category
252.1 Logic, Formal systems
252.11 Boolean algebras
252.12 Theorem proving, Constraint satisfaction systems
252.13 Dynamic logic, Temporal logic
252.14 Petri Nets
252.2 Automata theory
252.21 Finite state automata
252.22 Cellular automata
252.23 Stochastic automata
252.24 Sequential machines
252.25 Tree Automata
252.3 Formal languages
252.4 Programs schemata, Semantics, Correctness, Program. specifications (see also 241.8)
252.5 Computational complexity, Efficiency of algorithms, Algorithmic randomness
252.6 Algorithmic game theory, Algorithmic mechanism design, Algorithmic social choice, Electronic commerce
252.7 Computability, Unsolvability, Recursive functions
252.8 Rewriting systems, Graph reductions
253 Combinatorial mathematics, Discrete mathematics
253.1 Sorting
253.2 Graph theory, Graph algorithms
254 Mathematical programming
254.1 Linear programming, Non-linear programming, Dynamic programming, Network flows. (see also 93)
254.2 Optimization of application programs, Annealing. (see also 86)
255 Probability, Statistics
255.4 Monte-Carlo methods
256 Digital communications, Information theory, Coding, Data compression
256.1 Digital and analog communications--General
256.2 Information theory
256.3 Coding
256.4 Data compression
257 Symbolic algebraic computations
258 Cybernetics
258.1 Neural networks
258.2 Perception, Cognitive science
259 Systems and control theory
259.1 Linear systems
259.2 Nonlinear and complex systems
259.3 Control systems and theory
259.31 Feedback control systems
259.32 Digital control systems
259.33 Adaptive and fuzzy control
259.34 Process control
259.35 Optimal control