On the extension problems of isometric and nonexpansive mappings
X Yang, X Zhao - Mathematics Without Boundaries: Surveys in Pure …, 2014 - Springer
We present a survey of ideas and results stemming from the Tingley's problem: Let X and Y
be real normed spaces with unit spheres S_1(X) and S_1(Y), respectively. Suppose that …
be real normed spaces with unit spheres S_1(X) and S_1(Y), respectively. Suppose that …