Quasi-Cauchy sequences on asymmetric metric spaces


Dagci F. I., Cakalli H.

FILOMAT, cilt.38, sa.25, ss.8917-8923, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 38 Sayı: 25
  • Basım Tarihi: 2024
  • Doi Numarası: 10.2298/fil2425917d
  • Dergi Adı: FILOMAT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.8917-8923
  • İstanbul Kültür Üniversitesi Adresli: Evet

Özet

In recent years, quasi-Cauchy sequences have been studied by many authors in the real line and in metric spaces. In this paper, we investigate the concepts of quasi Cauchyness of sequences, ward compactness and ward continuity in asymmetric metric spaces. We prove that forward totally boundedness coincides with upward compactness, backward totally boundedness coincides with downward compactness, an upward continuous function on a subset E of an asymmetric metric space X to an asymmetric metric space Y is forward continuous under the condition that forward convergence implies backward convergence on X. We also prove some other interesting theorems.