Supported by the Fundamental Research Funds for the Central Universities;National Natural Science Foundation of China (Grant No. 10871101)
In this paper we study the isometric extension problem and show that every surjective isometry between the unit spheres of L^p(μ) (1 〈 p 〈∞, p ≠ 2) and a Banach space E can be extended to a linear isometry fr...
supported by National Natural Science Foundation of China (Grant No.10871101);the Research Fund for the Doctoral Program of Higher Education (Grant No. 20060055010)
Let X and Y be real Banach spaces.Suppose that the subset sm[S1(X)] of the smooth points of the unit sphere [S1(X)] is dense in S1(X).If T0 is a surjective 1-Lipschitz mapping between two unit spheres,then,under some ...
Supported by National Natural Science Foundation of China (Grant No. 10871101);Research Fund for the Doctoral Program of Higher Education (Grant No. 20060055010)
In this paper, we show that if Vo is a 1-Lipschitz mapping between unit spheres of two ALP-spaces with p 〉 2 and -Vo(S1(LP)) C Vo(S1(LP)), then V0 can be extended to a linear isometry defined on the whole spa...
Supported by NSFC (10871101);the Doctoral Programme Foundation of Institution of Higher Education (20060055010)
In this article, we prove that an into 1-Lipschitz mapping from the unit sphere of a Hilbert space to the unit sphere of an arbitrary normed space, which under some conditions, can be extended to be a linear isometry ...
Supported by National Natural Science Foundation of China (Grant No. 10871101);the Doctoral Pr0grame Foundation of Institution of Higher Education (Grant No. 20060055010)
In this paper, we prove that an into isometry form S(l(n)^∞) to S(E), which under some conditions, can be extended to be a linear isometry defined on the whole space. Therefore we improve the results of [Ding, ...