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On the Pettis measurability theorem

Published online by Cambridge University Press:  17 April 2009

Dietrich Helmer
Affiliation:
Department of MathematicsUniversity of BahrainPO Box 32038 Isa Town, Bahrain
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Abstract

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It is shown that, in Pettis's criterion for Bochner measurability of a vector-valued function f: SX, scalar measurability of f can be weakened to requiring that u of be measurable for u in some subset of the dual X* separating the points of X. Even then, the separability hypotheses in Pettis's Theorem can be weakened as well.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1994

References

[1]Diestel, J. and Uhl, J.J. jr, Vector measures, Mathematical Surveys 15 (American Mathematical Society, Providence, R.I. 1977).Google Scholar
[2]Dunford, N. and Schwartz, J.T., Linear operators I (Interscience Publ., New York: 1958).Google Scholar
[3]Edgar, G.A., ‘Measurability in a Banach space II’, Indiana Univ. Math. J. 28 (1979), 559579.Google Scholar
[4]Helmer, D., ‘Continuity of locally compact group actions with measurable orbit maps’, Math. Z. 172 (1980), 5153.Google Scholar
[5]Helmer, D., ‘Criteria for Eberlein compactness in spaces of continuous functions’, Manuacripta Math. 35 (1981), 2751.Google Scholar
[6]Helmer, D., ‘Structure of locally compact groups with metrizable connected components up to negligible subsets’, Arch. Math. 51 (1988), 332342.Google Scholar
[7]Helmer, D., Weakly compact and separable subsets of L∞(μ, X), (in preparation).Google Scholar
[8]Tulcea, A. Ionescu and Tulcea, C. Ionescu, Topics in the theory of lifting (Springer-Verlag, Berlin, Heidelberg, New York, 1969).Google Scholar
[9]Kelley, J.L., Namioka, I., Linear topological spaces (D. Van Nostrand, Princeton, N.J., 1963).Google Scholar
[10]Mägerl, G. and Namioka, I., ‘Intersection numbers and weak* separability of spaces of measures’, Math. Ann. 249 (1980), 273279.Google Scholar
[11]Namioka, I., ‘Separate continuity and joint continuity’, Pacific J. Math. 51 (1974), 515531.Google Scholar
[12]Pettis, B.J., ‘On integration in vector spaces’, Trans. Amer. Math. Soc. 44 (1938), 277304.Google Scholar
[13]Preiss, D. and Simon, P., ‘A weakly pseudocompact subspace of Banach space is weakly compact’, Comment. Math. Univ. Carolinae 15 (1974), 603609.Google Scholar
[14]Pták, V., ‘An extension theorem for separately continuous functions and its application to Functional Analysis’, Czechoslovak Math. J. 14 (1964), 562571.Google Scholar
[15]Rosenthal, H.P., ‘On injective Banach spaces and the spaces L∞(μ) for finite measures μ’, Acta Math. 124 (1970), 205248.Google Scholar
[16]Schwartz, L., Radon measures on arbitrary topological spaces and cylindrical measures (Oxford University Press, Bombay, 1973).Google Scholar
[17]Talagrand, M., ‘Separabilite vague dans l'espace des measures sur un compact’, Israel J. Math. 37 (1980), 171180.Google Scholar
[18]Talagrand, M., Pettis integral and measure theory, Memoirs 307 (American Mathematical Society, Providence, R.I., 1984).Google Scholar
[19]Uhl, J.J. jr., ‘Pettis's measurability theorem’, Contemp. Math. 2 (1980), 135144.Google Scholar
[20]Wheeler, R.F., ‘The retraction property, CCC property, and Dunford-Pettis-Phillips property for Banach spaces’, in Proc. Measure Theory Conf., Oberwolfach, Lecture Notes in Math. 945 (Springer-Verlag, Berlin, Heidelberg, New York, 1981), pp. 252262.Google Scholar