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University of North Texas

1. Shao, Chuang. Urysohn ultrametric spaces and isometry groups.

Degree: 2009, University of North Texas

In this dissertation we study a special sub-collection of Polish metric spaces: complete separable ultrametric spaces. Polish metric spaces have been studied for quite a long while, and a lot of results have been obtained. Motivated by some of earlier research, we work on the following two main parts in this dissertation. In the first part, we show the existence of Urysohn Polish R-ultrametric spaces, for an arbitrary countable set R of non-negative numbers, including 0. Then we give point-by-point construction of a countable R-ultra-Urysohn space. We also obtain a complete characterization for the set R which corresponding to a R-Urysohn metric space. From this characterization we conclude that there exist R-Urysohn spaces for a wide family of countable R. Moreover, we determine the complexity of the classification of all Polish ultrametric spaces. In the second part, we investigate the isometry groups of Polish ultrametric spaces. We prove that isometry group of an Urysohn Polish R-ultrametric space is universal among isometry groups of Polish R-ultrametric spaces. We completely characterize the isometry groups of finite ultrametric spaces and the isometry groups of countable compact ultrametric spaces. Moreover, we give some necessary conditions for finite groups to be isomorphic to some isometry groups of finite ultrametric spaces. Advisors/Committee Members: Gao, Su, Jackson, Steve, 1957-, Sari, Bunyamin.

Subjects/Keywords: Urysohn; ultrametric isometry group; universal; Metric spaces.; Isometrics (Mathematics)

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APA (6th Edition):

Shao, C. (2009). Urysohn ultrametric spaces and isometry groups. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc9918/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Shao, Chuang. “Urysohn ultrametric spaces and isometry groups.” 2009. Thesis, University of North Texas. Accessed August 05, 2020. https://digital.library.unt.edu/ark:/67531/metadc9918/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Shao, Chuang. “Urysohn ultrametric spaces and isometry groups.” 2009. Web. 05 Aug 2020.

Vancouver:

Shao C. Urysohn ultrametric spaces and isometry groups. [Internet] [Thesis]. University of North Texas; 2009. [cited 2020 Aug 05]. Available from: https://digital.library.unt.edu/ark:/67531/metadc9918/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shao C. Urysohn ultrametric spaces and isometry groups. [Thesis]. University of North Texas; 2009. Available from: https://digital.library.unt.edu/ark:/67531/metadc9918/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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