Title:  Positive orthant scalar controllability of bilinear systems 
 Authors:  Yu. L. Sachkov 
 Journal title:  Mathematical Notes 
 Year:  1995 
 Issue:  3 
 Volume:  58 
 Pages:  966–969 
 Citation:  
Yu. L. Sachkov, Positive orthant scalar controllability of bilinear systems, Mathematical Notes, 1995, 58:3, 966–969.
 Abstract:  
For the bilinear control system $$\dot{x}=(A+u\ B )x, x \in R^n, u \in R,\ $$ where $$A\ $$ is an $$\ n \times n$$ essentially nonnegative matrix, and $$B$$ is a diagonal matrix, the following controllability problem is investigated: can any two points with positive coordinates be joined by a trajectory of the system? For $$n>2 \ $$, the answer is negative in the generic case: hypersurfaces in $$R^n$$ are constructed that are intersected by all the trajectories of the system in one direction.
 MathNet (ENG):  
					http://mi.mathnet.ru/eng/mz2058

