a1 Institute of Mathematics and Informatics, Acad. G. Bonchev Str., Bl. 8, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; firstname.lastname@example.org.
a2 Département de Mathématiques, Université de Bretagne Occidentale, 6 avenue Victor Le Gorgeu, BP. 809, 29285 Brest Cedex, France; Marc.Quincampoix@univ-brest.fr.
In the present paper, we study the problem of small-time local attainability (STLA) of a closed set. For doing this, we introduce a new concept of variations of the reachable set well adapted to a given closed set and prove a new attainability result for a general dynamical system. This provide our main result for nonlinear control systems. Some applications to linear and polynomial systems are discussed and STLA necessary and sufficient conditions are obtained when the considered set is a hyperplane.
(Received September 7 2000)
(Received March 2001)
(Online publication August 15 2002)
Mathematics Subject Classification: