Examples and function theorems around AP and WAP spaces
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
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)
- A. V. Arhangel’skii, "Fundamentals of General Topology" (1984), D. Reidel Publishing Co
- A. Bella, "On spaces with the property of weak approximation by points", Comment. Math. Univ. Carolinae, 35(2), pp.357~360 (1994)
- A. Bella, "On AP and WAP spaces", Comment. Math. Univ. Carolinae, 40(3), pp.531~536 (1999)
- S. Davis, "Spaces with linearly ordered local bases", Topology Proc, 3(1), pp.37~51 (1979)
- R. Engelking, "General Topology" (1989), Heldermann
- 홍우철, "Generalized Fr'echet-Urysohn spaces", 대한수학회보, 44(2), pp.261~273 (2007), 대한수학회
- A. Pultr, "Equationally closed subframes and representation of qoutient spaces", Cahiers de Topologie et Geometrie Differentielle Categoriques, 34, pp.167~183 (1993)
- P. Simon, "On accumulation points", Cahiers de Topologie et Geometrie Differentielle Categoriques, 35, pp.321~327 (1994)
- L. A. Steen, "Counterexamples in Topology, Second Edition" (1978), Springer-Verlarg
- V. V. Tkachuk, "Almost closed sets and topologies they determine", Comment. Math. Univ. Carolinae, 42(2), pp.393~403 (2001)
