Partially paratopological groups

Ozel C., Piekosz A., Al Shumrani M., Wajch E.

TOPOLOGY AND ITS APPLICATIONS, cilt.228, ss.68-78, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 228
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.topol.2017.05.006
  • Dergi Adı: TOPOLOGY AND ITS APPLICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.68-78
  • Anahtar Kelimeler: Generalized topology, Strict continuity, Partially topological group, Partially paratopological group, TOPOLOGY
  • Dokuz Eylül Üniversitesi Adresli: Hayır

Özet

In this paper, we introduce the notion of a partially (para)topological group, using generalized topology in the sense of H. Delfs and M. Knebusch. We study some basic properties of this kind of structures. Among them, we prove that an important theorem of Banakh and Raysky, applied to their proof in ZFC that every regular paratopological group is completely regular, can be false in a model for ZF. Therefore, it is an open problem whether there exists a model for ZF in which a Hausdorff topological group need not be completely regular. We notice that Banakh Raysky theorem that every regular paratopological group is completely regular is provable in every model for ZF + DC. (C) 2017 Elsevier B.V. All rights reserved.