Continuity of the uniform rotundity modulus relative to linear subspaces

Manuel Fernández; Isidro Palacios

Commentationes Mathematicae Universitatis Carolinae (1997)

  • Volume: 38, Issue: 2, page 273-277
  • ISSN: 0010-2628

Abstract

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We prove the continuity of the rotundity modulus relative to linear subspaces of normed spaces. As a consequence we reduce the study of uniform rotundity relative to linear subspaces to the study of the same property relative to closed linear subspaces of Banach spaces.

How to cite

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Fernández, Manuel, and Palacios, Isidro. "Continuity of the uniform rotundity modulus relative to linear subspaces." Commentationes Mathematicae Universitatis Carolinae 38.2 (1997): 273-277. <http://eudml.org/doc/248045>.

@article{Fernández1997,
abstract = {We prove the continuity of the rotundity modulus relative to linear subspaces of normed spaces. As a consequence we reduce the study of uniform rotundity relative to linear subspaces to the study of the same property relative to closed linear subspaces of Banach spaces.},
author = {Fernández, Manuel, Palacios, Isidro},
journal = {Commentationes Mathematicae Universitatis Carolinae},
keywords = {uniform rotundity; Banach space; modulus of rotundity relative to a subspace; Hausdorff semimetric},
language = {eng},
number = {2},
pages = {273-277},
publisher = {Charles University in Prague, Faculty of Mathematics and Physics},
title = {Continuity of the uniform rotundity modulus relative to linear subspaces},
url = {http://eudml.org/doc/248045},
volume = {38},
year = {1997},
}

TY - JOUR
AU - Fernández, Manuel
AU - Palacios, Isidro
TI - Continuity of the uniform rotundity modulus relative to linear subspaces
JO - Commentationes Mathematicae Universitatis Carolinae
PY - 1997
PB - Charles University in Prague, Faculty of Mathematics and Physics
VL - 38
IS - 2
SP - 273
EP - 277
AB - We prove the continuity of the rotundity modulus relative to linear subspaces of normed spaces. As a consequence we reduce the study of uniform rotundity relative to linear subspaces to the study of the same property relative to closed linear subspaces of Banach spaces.
LA - eng
KW - uniform rotundity; Banach space; modulus of rotundity relative to a subspace; Hausdorff semimetric
UR - http://eudml.org/doc/248045
ER -

References

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  1. Clarkson J.A., Uniformly convex spaces, Trans. Amer. Math. Soc. 40 (1936), 396-414. (1936) Zbl0015.35604MR1501880
  2. Fakhoury H., Directions d'uniform convexité dans un space normé, Séminaire Choquet, 14 anné, No. 6 (1974). 
  3. Fernández M., Palacios I., Relative rotundity in L p ( X ) , Arch. Math. (Basel) 65 (1995), 61-68. (1995) MR1336225
  4. Fernández M., Palacios I., Directional uniform rotundity in spaces of essentially bounded vector functions, to appear in Proc. Amer. Math. Soc. MR1350942
  5. Garkavi A.L., The best possible net and the best possible cross-section of a set in a normed space, Izv. Akad. Nauk SSSR Ser. Mat. 26 (1962), 87-106 Amer. Math. Soc. Transl. Ser. 2 39 (1964), 111-132. (1964) MR0136969
  6. Goebel K., Kirk W.A., Topics in Metric Fixed Point Theory, Cambridge Studies in Advanced Mathematics No. 28, Cambridge Univ. Press, Cambridge, MA, 1990. MR1074005
  7. Kamińska A., Turett B., Some remarks on moduli of rotundity in Banach spaces, Acad. Scien. Math. Vol. 36, No. 5-6, 1988. MR1101665
  8. Lindenstrauss J., Tzafriri L., Classical Banach Space II, Springer-Verlag, Berlin-Heidelberg-New York, 1979. MR0540367
  9. Ullán A., Módulos de Convexidad y Lisura en Espacios Normados, Publ. Dep. Matemáticas Univ. Extremadura, No. 27, Badajoz, 1991. MR1174971

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