• Amsterdam properties of Wijsman hyperspaces

      Cao, J; Junnila, HJK (American Mathematical Society, 2010)
      In this paper we show the following results: (i) there exists a separable metric space of the first category whose Wijsman hyperspace is almost countably subcompact; (ii) there exists a σ-discrete crowded metric space whose ...
    • When is a Volettera space Baire?

      Cao, J; Junnila, HJK (University of Patras, 2006)
      In this talk, we study the problem when a Volterra space is Baire. It is shown that every stratifiable Volterra space is Baire. This answers affirmatively a question of Gruenhage and Lutzer in 2000. Further, it is established ...
    • Wijsman hyperspaces: subspaces and embeedings

      Cao, J; Junnila, HJK; Moors, WB (Elsevier, 2011)
      In this paper, topological properties of Wijsman hyperspaces are investigated. We study the existence of isolated points in Wijsman hyperspaces. We show that every Tychonoff space can be embedded as a closed subspace in ...