On computably locally compact hausdorff spaces

  • Authors:
  • Yatao Xu;Tanja Grubba

  • Affiliations:
  • Department of mathematics, nanjing university, nanjing 210093, p.r. china email: yataoxu@gmail.com;Department of mathematics and computer science, university of hagen, hagen 58097, germany email: tanja.grubba@fernuni-hagen.de

  • Venue:
  • Mathematical Structures in Computer Science
  • Year:
  • 2009

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Abstract

Locally compact Hausdorff spaces generalise Euclidean spaces and metric spaces from ‘metric’ to ‘topology’. But does the effectivity on the latter (Brattka and Weihrauch 1999; Weihrauch 2000) still hold for the former? In fact, some results will be totally changed. This paper provides a complete investigation of a specific kind of space – computably locally compact Hausdorff spaces. First we characterise this type of effective space, and then study computability on closed and compact subsets of them. We use the framework of the representation approach, TTE, where continuity and computability on finite and infinite sequences of symbols are defined canonically and transferred to abstract sets by means of notations and representations.