Matrix theory Mathematics 43 Algebra 17 Numerical analysis 9 Differential equations, Partial 8 Mathematical statistics 8 Engineering 7 Systems theory 7 Computer science 6 Differential equations 6 Field theory (Physics) 5 Number theory 5 Operator theory 5 Algorithms 4 Electronic data processing 4 Engineering mathematics 4 Topological groups 4 Vibration 4 Economics 3 Functions of complex variables 3 Geometry 3 Global analysis (Mathematics) 3 Group theory 3 Mathematical optimization 3 Mathematical physics 3 Operations research 3 Physics 3 Statistics 3 Structural control (Engineering) 3 Combinatorics 2