English

Strongly $\sigma$-metrizable spaces are super $\sigma$-metrizable

General Topology 2016-11-17 v1

Abstract

A topological space XX is called strongly σ\sigma-metrizable if X=nωXnX=\bigcup_{n\in\omega}X_n for an increasing sequence (Xn)nω(X_n)_{n\in\omega} of closed metrizable subspaces such that every convergence sequence in XX is contained in some XnX_n. If, in addition, every compact subset of XX is contained in some XnX_n, nωn\in\omega, then XX is called super σ\sigma-metrizable. Answering a question of V.K.Maslyuchenko and O.I.Filipchuk, we prove that a topological space is strongly σ\sigma-metrizable if and only if it is super σ\sigma-metrizable.

Keywords

Cite

@article{arxiv.1611.05351,
  title  = {Strongly $\sigma$-metrizable spaces are super $\sigma$-metrizable},
  author = {Taras Banakh},
  journal= {arXiv preprint arXiv:1611.05351},
  year   = {2016}
}

Comments

2 pages

R2 v1 2026-06-22T16:54:32.994Z