×

The Radon measures as functionals on Lipschitz functions. (English) Zbl 0749.28008

This paper is motivated by J. K. Pachl’s work [Pac. J. Math. 82, 519-521 (1979; Zbl 0419.28006)] concerning the Radon measures as functionals on the space \(U_ b(X)\) of all uniformly continuous norm bounded functions on a complete metric space \(X\). Let \(\text{Lip}_ b(X)\) be the space of all norm bounded Lipschitz functions on \(X\) and let \(M_ t(X)\) denote the space of all norm bounded Radon measures on \(X\). Observing the importance of the subspace \(\text{Lip}_ b(X)\) of \(U_ b(X)\), the author first studies the representation theory of some classes of linear functionals on it and gets that \(M_ t(X)\) can be identified with the space of all bounded linear functionals on \(\text{Lip}_ b(X)\) whose restrictions to \(B\) are continuous, where \(B\) is the closed unit ball of \(\text{Lip}_ b(X)\) endowed with the topology of uniform convergence on the compact sets. Next he studies compactness in the weak topology \(w(M_ t(X),\text{Lip}_ b(X))\) and obtains the following: if \(M\subset M_ t(X)\) is a relatively \(w(M_ t(X),\text{Lip}_ b(X))\) compact set with \(| m|(X)=1\) for all \(m\subset \hbox{cl}(M)\) (the closure of \(M\)), then \(w(M_ t(X),C_ b(X))\) coincides with \(w(M_ t(X),\text{Lip}_ b(X))\) on \(M\). Finally, the question whether \(w(M_ t(X),U_ b(X))\) is sequentially complete is considered and it is answered in the following form: \(w(M_ t(X),U_ b(X))\) is sequentially complete if and only if \(X\) is compact.

MSC:

28C05 Integration theory via linear functionals (Radon measures, Daniell integrals, etc.), representing set functions and measures
28C15 Set functions and measures on topological spaces (regularity of measures, etc.)
54D30 Compactness

Citations:

Zbl 0419.28006

References:

[1] A. D. AIexandroff: Additive set functions in abstract spaces. (Russian) Mat. Sb. 8 (1940) 307-348; 9 (1941) 563-628; 13 (1943) 169-238. · JFM 66.0218.01
[2] N. Bourbaki: Éléments de mathématique, Livre VI, Intégration. Paris, Hermann 1959-1969. · Zbl 0115.04903
[3] Le-Cam: Convergence in distribution of stochastic processes. Univ. California Publ. Statist. 2, No. 11 (1957) 207-236. · Zbl 0077.12301
[4] R. M. Dudley: Convergence of Baire measures. Studia Math., 27 (1966) 251 - 268. · Zbl 0147.31301
[5] R. Engelking: General Topology. PWN Warszawa 1977. · Zbl 0373.54002
[6] D. H. Fremlin D. J. H. Garling, R. G. Haydon: Bounded measures on topological spaces. Proc. London Math. Soc. 3, No. 25 (1972) 115-136. · Zbl 0236.46025 · doi:10.1112/plms/s3-25.1.115
[7] P. R. Halmos: Measure Theory. New York, D. Van Nostrand 1950. · Zbl 0040.16802
[8] J. L. Kelley: General Topology. New York, D. Van Nostrand 1955. · Zbl 0066.16604
[9] J. K. Pachl: Measures as functionals on uniformly continuous functions. Pacific J. Math, 82, No.2 (1979) 515-521. · Zbl 0419.28006 · doi:10.2140/pjm.1979.82.515
[10] J. Štěpán: Theory of Probability. (Czech), Academia, Praha 1987.
[11] F. Topsoe: Topology and Measure. Springer, Berlin 1970. · Zbl 0197.33301
[12] F. Topsoe D. Pollard: A unified approach to the Riesz type representation theorems. Studia Math., 54 (1975) 173-190. · Zbl 0321.28006
[13] V. S. Varadarjan: Measures on topological spaces. Mat. Sb. 55 (1961) 35-100.
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.