The paper establish a necessary condition for a matrix dynamic system X^\Delta = PX+QU, U^\Delta = RX+SU to have a solution satisfying the condition U^T U +- X^T X =I.
The paper establish a necessary condition for a matrix dynamic system X^\Delta = PX+QU, U^\Delta = RX+SU to have a solution satisfying the condition U^T U +- X^T X =I. (en)
The paper establish a necessary condition for a matrix dynamic system X^\Delta = PX+QU, U^\Delta = RX+SU to have a solution satisfying the condition U^T U +- X^T X =I. (cs)