... center of much interest for a longtime in connection with a problem of reactor dynamics (Levin and Nohel [11]). TheLiapunov function here, having its root in the work of Levin [10], continues to ... G´orniewicz and Nistri [8], and references therein.Hindawi Publishing CorporationFixed Point Theory and ApplicationsVolume 2006, Article ID 41480, Pages 1–14DOI 10.1155/FPTA/2006/414802 Fixed points ... was supported in part by NSF of China (10471021).8 Fixed points and controllability in delay systemswhere Cijis the cofactor of wi,wj in the mat rix (wi,wj)n×n ,and 1|α|≤|a|≤2|α|for...