摘要
In this paper,we first determine the relations among the best bounds A and B of the g-frame,the g-frame operator S and the pre-frame operator Q and give a necessary and sufficient condition for a g-frame with bounds A and B in a complex Hilbert space.We also introduce the definition of a g-frame sequence and obtain a necessary and sufficient condition for a g-frame sequence with bounds A and B in a complex Hilbert space.Lastly,we consider the stability of a g-frame sequence for a complex Hilbert space under perturbation.
基金
supported by Natural Science Foundation of Fujian Province of China(No.2009J01007)
Education Commission Foundation of Fujian Province of China(No.JA08013)