### Abstract

The following result due to Hanai, Morita, and Stone is well known: Let f be a closed continuous map of a metric space X onto a topological space Y. Then the following statements are equivalent: (i) Y satisfies the first countability axiom; (ii) for each y ∈ Y, f^{- 1} {y} has a compact boundary in X; (iii) Y is metrizable. In this article we obtain several related results in the setting of topological ordered spaces. In particular we investigate the upper and lower topologies of metrizable topological ordered spaces which are both C- and I-spaces in the sense of Priestley.

Original language | English |
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Pages (from-to) | 2914-2922 |

Number of pages | 9 |

Journal | Topology and its Applications |

Volume | 156 |

Issue number | 18 |

DOIs | |

Publication status | Published - Dec 1 2009 |

### All Science Journal Classification (ASJC) codes

- Geometry and Topology

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## Cite this

Künzi, H. P. A., & Mushaandja, Z. (2009). Topological ordered C- (resp. I-)spaces and generalized metric spaces.

*Topology and its Applications*,*156*(18), 2914-2922. https://doi.org/10.1016/j.topol.2008.12.040