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Extreme points in Orlicz spaces equipped with s‐norms and closedness

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Listed:
  • Esra Başar
  • Serap Öztop
  • Badik Hüseyin Uysal
  • Şeyma Yaşar

Abstract

Let Φ be an Orlicz function and LΦ(X,Σ,μ)$L^\Phi (X, \Sigma , \mu )$ be the corresponding Orlicz space on a non‐atomic, σ‐finite, complete measure space (X,Σ,μ)$(X,\Sigma ,\mu )$. We describe the extreme points of unit ball of Orlicz spaces equipped with the s‐norm. We also investigate the closedness of the set of extreme points of unit ball. Our study generalizes and unifies the results that have been obtained for the Orlicz norm, the Luxemburg norm and the p‐Amemiya norm separately. We further classify the outer functions that generate s‐norms with respect to a constant.

Suggested Citation

  • Esra Başar & Serap Öztop & Badik Hüseyin Uysal & Şeyma Yaşar, 2023. "Extreme points in Orlicz spaces equipped with s‐norms and closedness," Mathematische Nachrichten, Wiley Blackwell, vol. 296(11), pages 5042-5062, November.
    • Handle: RePEc:bla:mathna:v:296:y:2023:i:11:p:5042-5062
    DOI: 10.1002/mana.202200374
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