2001
- ▪A. C. Antoulas, E. D. Sontag, Y. Yamamoto, "Controllability and Observability", In Wiley Encyclopedia of Electrical and Electronics Engineering, pp. 264-281, 2001. wwwdoipdf
1989
- ▪E.D. Sontag, Y. Yamamoto, "On the existence of approximately coprime factorizations for retarded systems", Systems Control Lett., vol. 13, no. 1, pp. 53–58, 1989. doipdf
Abstract
This note establishes a result linking algebraically coprime factorizations of transfer matrices of delay systems to approximately coprime factorizations in the sense of distributions. The latter have been employed by the second author in the study of function-space controllability for such systems.