In this paper,we shall exploit the Freud method in the Classical operator approximation theory to im-prove known quantitative estimalions with an emphasis on Ca
In this paper we present a correction of the proof of u strong uniqueness theorem given by H. Struuss [1] in 1992 on approximation by reciprocals of functions u
David, Journe and Semmes proved the Tb theorem for para-accreclive funclions and showed this theo-rem is optimal in certain sense. In this note, we give a techn