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Examples and function theorems around AP and WAP spaces

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We provide some examples around AP and WAP spaces which are connected with higher convergence properties-radiality, semiradiality and pseudoradiality. We also prove a theorem (Theorem 3.2) that (a) any pseudo-open continuous image of an AP-space is an APspace and (b) any pseudo-open continuous image of an WAP-space is an WAP-space. This answers the question posed by V. V. Tkachuk and I. V. Yaschenko [10].

Abstract

We provide some examples around AP and WAP spaces which are connected with higher convergence properties-radiality, semiradiality and pseudoradiality. We also prove a theorem (Theorem 3.2) that (a) any pseudo-open continuous image of an AP-space is an APspace and (b) any pseudo-open continuous image of an WAP-space is an WAP-space. This answers the question posed by V. V. Tkachuk and I. V. Yaschenko [10].

참고문헌 (10)

  1. A. V. Arhangel’skii, "Fundamentals of General Topology" (1984), D. Reidel Publishing Co
  2. A. Bella, "On spaces with the property of weak approximation by points", Comment. Math. Univ. Carolinae, 35(2), pp.357~360 (1994)
  3. A. Bella, "On AP and WAP spaces", Comment. Math. Univ. Carolinae, 40(3), pp.531~536 (1999)
  4. S. Davis, "Spaces with linearly ordered local bases", Topology Proc, 3(1), pp.37~51 (1979)
  5. R. Engelking, "General Topology" (1989), Heldermann
  6. 홍우철, "Generalized Fr'echet-Urysohn spaces", 대한수학회보, 44(2), pp.261~273 (2007), 대한수학회
  7. A. Pultr, "Equationally closed subframes and representation of qoutient spaces", Cahiers de Topologie et Geometrie Differentielle Categoriques, 34, pp.167~183 (1993)
  8. P. Simon, "On accumulation points", Cahiers de Topologie et Geometrie Differentielle Categoriques, 35, pp.321~327 (1994)
  9. L. A. Steen, "Counterexamples in Topology, Second Edition" (1978), Springer-Verlarg
  10. V. V. Tkachuk, "Almost closed sets and topologies they determine", Comment. Math. Univ. Carolinae, 42(2), pp.393~403 (2001)

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