This paper is concerned with the electromagnetic scattering by a nonperfectly conductor obstacle in chiral environment.A two-dimensional mathematical model is e
An operator T is called k-quasi-*-A(n) operator,if T*k|T1+n|2/1+nTk ≥T*k|T*|2Tk,k ∈ Z,which is a generalization of quasi-*-A(n) operator.In this paper we pro