A note on copies of c 0 in spaces of weak* measurable functions

Juan Carlos Ferrando

Commentationes Mathematicae Universitatis Carolinae (2000)

  • Volume: 41, Issue: 4, page 761-764
  • ISSN: 0010-2628

Abstract

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If ( Ω , Σ , μ ) is a finite measure space and X a Banach space, in this note we show that L w * 1 ( μ , X * ) , the Banach space of all classes of weak* equivalent X * -valued weak* measurable functions f defined on Ω such that f ( ω ) g ( ω ) a.e. for some g L 1 ( μ ) equipped with its usual norm, contains a copy of c 0 if and only if X * contains a copy of c 0 .

How to cite

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Ferrando, Juan Carlos. "A note on copies of $c_0$ in spaces of weak* measurable functions." Commentationes Mathematicae Universitatis Carolinae 41.4 (2000): 761-764. <http://eudml.org/doc/248590>.

@article{Ferrando2000,
abstract = {If $(\Omega ,\Sigma ,\mu )$ is a finite measure space and $X$ a Banach space, in this note we show that $L_\{w^\{\ast \}\}^\{1\}(\mu ,X^\{\ast \})$, the Banach space of all classes of weak* equivalent $X^\{\ast \}$-valued weak* measurable functions $f$ defined on $\Omega $ such that $\Vert f(\omega )\Vert \le g(\omega )$ a.e. for some $g\in L_\{1\}(\mu )$ equipped with its usual norm, contains a copy of $c_\{0\}$ if and only if $X^\{\ast \}$ contains a copy of $c_\{0\}$.},
author = {Ferrando, Juan Carlos},
journal = {Commentationes Mathematicae Universitatis Carolinae},
keywords = {weak* measurable function; copy of $c_0$; copy of $\ell _1$; weak measurable function; copy of ; copy of },
language = {eng},
number = {4},
pages = {761-764},
publisher = {Charles University in Prague, Faculty of Mathematics and Physics},
title = {A note on copies of $c_0$ in spaces of weak* measurable functions},
url = {http://eudml.org/doc/248590},
volume = {41},
year = {2000},
}

TY - JOUR
AU - Ferrando, Juan Carlos
TI - A note on copies of $c_0$ in spaces of weak* measurable functions
JO - Commentationes Mathematicae Universitatis Carolinae
PY - 2000
PB - Charles University in Prague, Faculty of Mathematics and Physics
VL - 41
IS - 4
SP - 761
EP - 764
AB - If $(\Omega ,\Sigma ,\mu )$ is a finite measure space and $X$ a Banach space, in this note we show that $L_{w^{\ast }}^{1}(\mu ,X^{\ast })$, the Banach space of all classes of weak* equivalent $X^{\ast }$-valued weak* measurable functions $f$ defined on $\Omega $ such that $\Vert f(\omega )\Vert \le g(\omega )$ a.e. for some $g\in L_{1}(\mu )$ equipped with its usual norm, contains a copy of $c_{0}$ if and only if $X^{\ast }$ contains a copy of $c_{0}$.
LA - eng
KW - weak* measurable function; copy of $c_0$; copy of $\ell _1$; weak measurable function; copy of ; copy of
UR - http://eudml.org/doc/248590
ER -

References

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  1. Bourgain J., An averaging result for c 0 -sequences, Bull. Soc. Math. Belg. 30 (1978), 83-87. (1978) Zbl0417.46019MR0549653
  2. Cembranos P., Mendoza J., Banach Spaces of Vector-Valued Functions, Lecture Notes in Math. 1676, Springer, 1997. Zbl0902.46017MR1489231
  3. Diestel J., Sequences and Series in Banach Spaces, GTM 92, Springer-Verlag, 1984. MR0737004
  4. Dunford N., Schwartz J.T., Linear Operators. Part I, John Wiley, Wiley Interscience, New York, 1988. Zbl0635.47001MR1009162
  5. Hoffmann-Jørgensen J., Sums of independent Banach space valued random variables, Studia Math. 52 (1974), 159-186. (1974) MR0356155
  6. Hu Z., Lin B.-L., Extremal structure of the unit ball of L p ( μ , X ) , J. Math. Anal. Appl. 200 (1996), 567-590. (1996) MR1393102
  7. Kwapień S., On Banach spaces containing c 0 , Studia Math. 52 (1974), 187-188. (1974) MR0356156
  8. Mendoza J., Complemented copies of 1 in L p ( μ , X ) , Math. Proc. Camb. Phil. Soc. 111 (1992), 531-534. (1992) MR1151329
  9. Saab E., Saab P., A stability property of a class of Banach spaces not containing a complemented copy of 1 , Proc. Amer. Math. Soc. 84 (1982), 44-46. (1982) MR0633274

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