Dissertations, Academic (Ph.D) 48 Thesis (Ph.D)-Mathematics Fuzzy sets 16 Graph theory 8 Fuzzy systems 6 Fuzzy mathematics 5 Fuzzy numbers 5 Graphic methods 2 Intuitionistic mathematics 2 Lattice theory 2 Linear topological spaces 2 Topology 2 Ability grouping in education 1 Algorithms 1 Approximation theory 1 Artificial satellites-Orbit method 1 Artificial satellites-Orbits 1 Astrodynamics 1 Computational intelligence 1 Covex sets 1 Covexity spaces 1 Data mining-Mathematical models 1 Decision theory 1 Diagnosis-Fuzzy sets 1 Digital imaging 1 Digital imaging-Mathematical aspects 1 Directed graphs 1 Econometrics 1 Economics, Mathematical 1 Economics-Mathematical applications 1