Opuscula Math. 41, no. 5 (2021), 629-648
https://doi.org/10.7494/OpMath.2021.41.5.629
Opuscula Mathematica
Extreme points of the Besicovitch-Orlicz space of almost periodic functions equipped with Orlicz norm
Fatiha Boulahia
Slimane Hassaine
Abstract. In the present paper, we give criteria for the existence of extreme points of the Besicovitch-Orlicz space of almost periodic functions equipped with Orlicz norm. Some properties of the set of attainable points of the Amemiya norm in this space are also discussed.
Keywords: extreme points, strict convexity, almost periodic functions, Besicovitch-Orlicz spaces of almost periodic functions.
Mathematics Subject Classification: 46B20, 46B25, 46E30.
- F. Bedouhene, M. Morsli, M. Smaali, On some equivalent geometric properties in the Besicovitch-Orlicz space of almost periodic functions with Luxemburg norm, Commentat. Math. Univ. Carol. 51 (2010), no. 1, 25-35.
- A.S. Besicovitch, Almost Periodic Functions, Neudruck, New York: Dover Publications, 1955.
- F. Boulahia, M. Morsli, Uniform non-squareness and property \((\beta)\) of Besicovitch-Orlicz spaces of almost periodic functions with Orlicz norm, Comment. Math. Univ. Carol. 51 (2010), no. 3, 417-426.
- S. Chen, Geometry of Orlicz spaces, Dissertationes Math. 356 (1996).
- J. Diestel, Geometry of Banach Spaces: Selected Topics, Springer, 1975.
- Y. Djabri, F. Bedouhene, F. Boulahia, Further properties of Stepanov-Orlicz almost periodic functions, Comment. Math. Univ. Carol. 61 (2020), no. 3, 363-382.
- P. Foralewski, H. Hudzik, R. Płuciennik, Orlicz spaces without extreme points, J. Math. Anal. Appl. 361 (2010), no. 2, 506-519.
- S. Hassaine, F. Boulahia, Extreme points of the Besicovitch-Orlicz space of almost periodic functions equipped with the Luxemburg norm, Comment. Math. Univ. Carol. 62 (2021), no. 1, 67-79.
- T.R. Hillmann, Besicovitch-Orlicz spaces of almost periodic functions, Real and Stochastic Analysis, Wiley Ser. Probab. Math. Stat., 119-167, 1986.
- K.S. Lau, On the Banach spaces of functions with bounded upper means, Pac. J. Appl. Math. 91 (1980), no. 1, 153-172.
- M. Morsli, On some convexity properties of the Besicovitch-Orlicz space of almost periodic functions, Comment. Math. 34 (1994), 137-152.
- M. Morsli, On modular approximation property in the Besicovitch-Orlicz space of almost periodic functions, Commentat. Math. Univ. Carolin. 38 (1997), no. 3, 485-496.
- M. Morsli, F. Bedouhene, On the strict convexity of the Besicovitch-Orlicz space of almost periodic functions with Orlicz norm, Rev. Mat. Complut. 16 (2003), no. 2, 399-415.
- M. Morsli, F. Bedouhene, On the uniform convexity of the Besicovitch-Orlicz space of almost periodic functions with Orlicz norm, Colloq. Math. 102 (2005), no. 1, 97-111.
- M. Morsli, F. Boulahia, Uniformly non-\(l_n^1\) Besicovitch-Orlicz space of almost periodic functions, Ann. Soc. Math. Pol., Ser. I, Commentat. Math. 45 (2005), no. 1, 25-34.
- M. Morsli, F. Bedouhene, F. Boulahia, Duality properties and Riesz representation theorem in the Besicovitch-Orlicz space of almost periodic function, Comment. Math. Univ. Carol. 43 (2002), no. 1, 103-117.
- M. Morsli, M. Smaali, On the strict convexity of the Besicovitch-Musielak-Orlicz space of almost periodic functions, Commentat. Math. Unvi. Carol. 48 (2007), no. 3, 443-458.
- M.A. Picardello, Function spaces with bounded \(L^p\) means and their continuous functionals, Abstr. Appl. Anal. 2014 (2014), Article no. 609525.
- S. Shang, Y. Cui, Y. Fu, Extreme points and rotundity in Musielak-Orlicz-Bochner function spaces endowed with Orlicz norm, Abstr. Appl. Anal. 2010 (2010), Article no. 914183.
- W. Stepanoff, Einige Verallgemeinerungen der fast periodischen Funktionen, Math. Ann. 95 (1926), no. 1, 473-498.
- M. Wisła, Geometric properties of Orlicz spaces equipped with \(p\)-Amemiya norms - results and open questions, Commentat. Math. 55 (2015), no. 2, 183-209.
- Fatiha Boulahia (corresponding author)
https://orcid.org/0000-0002-3942-7963
- University A. Mira of Bejaia, Laboratory of Applied Mathematics, Department of Mathematics, Faculty of Exact Sciences, Targa Ouzemour, 06000 Bejaia, Algeria
- Slimane Hassaine
- University of Mouloud Mammeri, Tizi-Ouzou, Department of Mathematics, Faculty of Sciences, Tizi-Ouzou BP No 17, RP 15000, Algeria
- University of Bejaia, Laboratory of Applied Mathematics, Algeria
- Communicated by P.A. Cojuhari.
- Received: 2020-09-04.
- Revised: 2021-04-15.
- Accepted: 2021-09-10.
- Published online: 2021-09-30.