Generalized limits and sequence of matrices

Ozguc I., Tas E., Yurdakadim T.

POSITIVITY, cilt.24, sa.3, ss.553-563, 2020 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24 Sayı: 3
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s11117-019-00696-y
  • Dergi Adı: POSITIVITY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, ABI/INFORM, Business Source Elite, Business Source Premier, MathSciNet, zbMATH
  • Sayfa Sayıları: ss.553-563
  • Anahtar Kelimeler: The Hahn-Banach extension theorem, Banach limit, B-statistical limit superior and inferior, Sequence of infinite matrices
  • Ankara Üniversitesi Adresli: Evet

Özet

Banach has proved that there exist positive linear regular functionals on m such that they are invariant under shift operator where m is the space of all bounded real sequences. It has also been shown that there exists positive linear regular functionals L on m such that L(chi(K))=0 for every characteristic sequence chi(K) of sets, K, of natural density zero. Recently the comparison of such functionals and some applications have been examined. In this paper we define S-B-limits and B-Banach limits where B is a sequence of infinite matrices. It is clear that if B=(A) then these definitions reduce to S-A-limits and A-Banach limits. We also show that the sets of all S-B-limits and Banach limits are distinct but their intersection is not empty. Furthermore, we obtain that the generalized limits generated by B where B is strongly regular is equal to the set of Banach limits.