Computational complexity 34 Congresses 32 Machine theory 11 Data processing 10 Trees (Graph theory) 8 Data structures (Computer science) 7 Algorithms 6 Computable functions 3 Approximation theory 2 Computer programming 2 Computer science 2 Electronic data processing 2 Formal languages 2 Logic, Symbolic and mathematical 2 Mathematical optimization 2 Mathematics 2 Programming languages (Electronic computers) 2 Artificial intelligence 1 Categories (Mathematics) 1 Computers 1 Data structure (Computer science) 1 Electronic digital computers 1 Gödel's theorem 1 Numerical analysis 1 Programming 1 Recursion theory 1 Turing machines 1