n.the state of being actual or real
同义词：realityrealism
On positive realness of descriptor systems
Positive Realness and Absolute Stability Problem of Descriptor Systems
Robust strict positive realness: characterization and construction
Robust strict positive realness: characterization and construction
New positive realness conditions for uncertain discrete descriptor systems: Analysis and synthesis
An improved characterization of bounded realness for singular delay systems and its applications
Time domain and frequency domain conditions for strict positive realness
Multistage IIR filter design using convex stability domains defined by positive realness
Dynamical system design from a control perspective: finite frequency positive-realness approach
Exponentially dissipative nonlinear dynamical systems: a nonlinear extension of strict positive realness
