Approximation algorithms 29 Optimization 5 Algorithms 4 Graphic methods 4 Stochastic systems 4 Economics 3 Graph theory 3 Iterative methods 3 Parameter estimation 3 Trajectories 3 algorithm 3 Antennas 2 Approximate algorithms 2 Approximation 2 Approximation theory 2 Bayes Theorem 2 Bayes theorem 2 Bayesian networks 2 Budget control 2 Computational complexity 2 Computer Simulation 2 Convergence 2 Cost benefit analysis 2 Costs 2 Cytology 2 Digital storage 2 Distributed algorithms 2 Energy efficiency 2 Humans 2 Independent set 2