Some geometric properties of the Ces{à}ro function spaces Cp,wC_{p,w}, 1⩽p<∞1\leqslant p<\infty, induced by an arbitrary positive weight function ww on an interval (0,l)(0,l) where 0<l⩽∞0 < l \leqslant\infty are studied in this paper. It is shown that all non-empty relatively weakly open sets in the unit ball of Cp,wC_{p,w} have diameter 22. Also Cp,wC_{p,w}, 1<p<∞1<p<\infty is strictly convex but no point of its unit ball is strongly extreme. Moreover, some connections between uniformly non-square points and various geometric properties in general Banach spaces are presented.

Contact details are reproduced from the original publication and may be historical.

Damian Kubiak

Mathematics Department, Tennessee Technological University, 110 University Drive, Box 5054, Cookeville, TN 38505, U.S.A.

dkubiak@tntech.edu
  1. T. Abrahamsen, V. Lima, O. Nygaard: Almost isometric ideals in Banach spaces, Glasgow Math. J. FirstView (2013) 1–13; arXiv: 1206.3539v2 [math.FA] (2013).https://doi.org/10.1017/S0017089513000335Google Scholar
  2. T. Abrahamsen, V. Lima, O. Nygaard: Remarks on diameter 2 properties, J. Convex Analysis 20(2) (2013) 439–452.https://doi.org/10.68381/jca20026Google Scholar
  3. M. D. Acosta, A. Kamińska, M. Mastyło: The Daugavet property and weak neighborhoods in Banach lattices, J. Convex Analysis 19(3) (2012) 875–912.https://doi.org/10.68381/jca19046Google Scholar
  4. S. V. Astashkin, L. Maligranda: Cesàro function spaces fail the fixed point property, Proc. Amer. Math. Soc. 136(12) (2008) 4289–4294.https://doi.org/10.1090/S0002-9939-08-09599-3Google Scholar
  5. S. V. Astashkin, L. Maligranda: Structure of Cesàro function spaces, Indag. Math., New Ser. 20(3) (2009) 329–379.https://doi.org/10.1016/S0019-3577(10)00002-9Google Scholar
  6. S. V. Astashkin, L. Maligranda: Rademacher functions in Cesàro type spaces, Stud. Math. 198(3) (2010) 235–247.https://doi.org/10.4064/sm198-3-3Google Scholar
  7. S. Chen: Geometry of Orlicz spaces, Diss. Math. 356 (1996) 204 p.Google Scholar
  8. Y. Cui, R. Płuciennik: Local uniform nonsquareness in Cesàro sequence spaces, Ann. Soc. Math. Pol., Ser. I, Commentat. Math. 37 (1997) 47–58.Google Scholar
  9. S. J. Dilworth, M. Girardi, J. Hagler: Dual Banach spaces which contain an isometric copy of L1, Bull. Pol. Acad. Sci., Math. 48(1) (2000) 1–12.Google Scholar
  10. P. N. Dowling, C. J. Lennard, B. Turett: Reflexivity and the fixed-point property for nonexpansive maps, J. Math. Anal. Appl. 200(3) (1996) 653–662.https://doi.org/10.1006/jmaa.1996.0229Google Scholar
  11. P. Foralewski, H. Hudzik, P. Kolwicz: Non-squareness properties of Orlicz–Lorentz sequence spaces, J. Funct. Anal. 264(2) (2013) 605–629.https://doi.org/10.1016/j.jfa.2012.10.014Google Scholar
  12. H. Hudzik, K. Wlaźlak: Rotundity properties in Banach spaces via sublinear operators, Nonlinear Anal. 64(6) (2006) 1171–1188.https://doi.org/10.1016/j.na.2005.05.060Google Scholar
  13. A. Kamińska, D. Kubiak: On the dual of Cesàro function space, Nonlinear Anal. 75(5) (2012) 2760–2773.https://doi.org/10.1016/j.na.2011.11.019Google Scholar
  14. D. M. Kubiak: Geometric Properties of Cesàro Function and Sequence Spaces, Ph.D. Thesis, University of Memphis, ProQuest LLC, Ann Arbor (2012) 100 p.Google Scholar
  15. J. J. Schäffer: Geometry of Spheres in Normed Spaces, Lecture Notes in Pure and Applied Mathematics 20, Marcel Dekker, New York (1976).Google Scholar
  16. J.-S. Shiue: A note on Cesàro function space, Tamkang J. Math. 1(2) (1970) 91–95.Google Scholar

D. Kubiak. “Some Geometric Properties of the Cesàro Function Spaces.” Journal of Convex Analysis 21 (2014), No. 1, 189–200. https://doi.org/10.68381/jca21010