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Metric marginal problems for set-valued or non-measurable variables
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  • Published: June 1994

Metric marginal problems for set-valued or non-measurable variables

  • R. M. Dudley1 

Probability Theory and Related Fields volume 100, pages 175–189 (1994)Cite this article

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Summary

In a separable metric space, if two Borel probability measures (laws) are nearby in a suitable metric, then there exist random variables with those laws which are nearby in probability. Specifically, by a well-known theorem of Strassen, the Prohorov distance between two laws is the infimum of Ky Fan distances of random variables with those laws. The present paper considers possible extensions of Strassen's theorem to two random elements one of which may be (compact) set-valued and/or non-measurable. There are positive results in finite-dimensional spaces, but with factors depending on the dimension. Examples show that such factors cannot entirely be avoided, so that the extension of Strassen's theorem to the present situation fails in infinite dimensions.

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Authors and Affiliations

  1. Department of Mathematics, Massachusetts Institute of Technology, 02139-4307, Cambridge, MA, USA

    R. M. Dudley

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  1. R. M. Dudley
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Additional information

This research was partially supported by a Guggenheim Fellowship, by National Science Foundation grant DMS 8505550 at MSRI-Berkeley, and other NSF grants

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Dudley, R.M. Metric marginal problems for set-valued or non-measurable variables. Probab. Th. Rel. Fields 100, 175–189 (1994). https://doi.org/10.1007/BF01199264

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  • Received: 31 May 1993

  • Revised: 25 March 1994

  • Issue Date: June 1994

  • DOI: https://doi.org/10.1007/BF01199264

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