On Selecting k Balls from an n-line or n-circle without t-separations

ＯｎＳｅｌｅｃｔｉｎｇｋＢａｌｌｓｆｒｏｍａｎｎ－ｌｉｎｅｏｒｎ－ｃｉｒｃｌｅｗｉｔｈｏｕｔｔ－ｓｅｐａｒａｔｉｏｎｓ￥（蒋茂森）ＪｉａｎｇＭａｏｓｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ,ＪｉｌｉｎＵｎｉｖｅｒｓｉｔｙ,Ｃｈａｎｇｃｈｕ...     

On the existence of an element with given deviations from an expanding system of subspaces

The problem as to whether a Banach space contains an element with given deviations from an expanding system of strictly nested subspaces (which are not necessarily finite-dimensional) is solved under additional restrictions on the deviations or subspaces.     

On an Operator {M_{u}\mathcal{R}} from Mixed Norm Spaces to Zygmund-Type Spaces on the Unit Ball

In this paper, we obtain complete characterizations of the boundedness and compactness of the products of the multiplication and the radial derivative operator M _u R from mixed norm spaces ${H(p, q, \phi)}$ to Zygmund-type spaces on the unit ball.