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4 - Real-valued functions

Published online by Cambridge University Press:  14 May 2010

Togo Nishiura
Affiliation:
Wayne State University, Detroit
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Summary

In this chapter, attention is turned to topics in analysis such as measurability, derivatives and integrals of real–valued functions. Several connections between real–valued functions of a real variable and universally measurable sets in R have appeared in the literature. Four connections and their generalizations will be presented. The material developed in the earlier chapters are used in the generalizations. The fifth topic concerns the images of Lusin spaces under Borel measurable real valued functions – the classical result that these images are absolute null spaces will be proved. A brief description of the first four connections is given next before proceeding.

The first connection is a problem posed by A. J. Goldman [64] about σ–algebras associated with Lebesgue measurable functions; Darst's solution [35] will be given. A natural extension of Darst's theorem will follow from results of earlier chapters. Indeed, it will be shown that the domain of the function can be chosen to be any absolute measurable space that is not an absolute null space.

The second addresses the question of whether conditions such as bounded variation or infinitely differentiability have connections to theorems such as Purves's theorem; namely, for such functions, are the images of universally measurable sets in ℝ necessarily universally measurable sets in ℝ? Darst's negative resolutions of these questions will be presented.

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Publisher: Cambridge University Press
Print publication year: 2008

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  • Real-valued functions
  • Togo Nishiura, Wayne State University, Detroit
  • Book: Absolute Measurable Spaces
  • Online publication: 14 May 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511721380.005
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  • Real-valued functions
  • Togo Nishiura, Wayne State University, Detroit
  • Book: Absolute Measurable Spaces
  • Online publication: 14 May 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511721380.005
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Real-valued functions
  • Togo Nishiura, Wayne State University, Detroit
  • Book: Absolute Measurable Spaces
  • Online publication: 14 May 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511721380.005
Available formats
×