93Cxx Control systems, guided systems

93C05  Linear
93C10  Nonlinear
93C15  Systems governed by ordinary differential equations
93C20  Systems governed by partial differential equations
93C22  Systems governed by integral equations
93C25  Systems in abstract spaces
93C30  Systems governed by functional relations other than
               differential or integral equations
93C35  Multivariable, multidimensional systems
93C40  Adaptive control systems
93C41  Problems with incomplete information
93C42  Fuzzy control
93C45  Time-invariant
93C50  Time-dependent
93C55  Discrete-time
93C57  Sampled-data
93C60  Continuous-time
93C62  Digital systems
93C70  Time-scale analysis and related topics
93C73  Perturbations in control systems
93C80  Frequency-response methods
93C83  Control problems involving computers (process control,
               etc.)
93C85  Automated systems (robots, etc.)
93C90  Random disturbances in control systems
93C95  Applications of control theory
93C99  None of the above but in this section