Abstract
The Banach–Zaretsky Theorem is a fundamental but often overlooked result that characterizes the functions that are absolutely continuous. This chapter presents basic results on differentiability, absolute continuity, and the Fundamental Theorem of Calculus with an emphasis on the role of the Banach–Zaretsky Theorem.
This work was partially supported by a grant from the Simons Foundation.
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Acknowledgements
This chapter draws extensively from Chapters 5 and 6 of [6]. That material is used with permission of Springer. Many classic and recent volumes influenced the writing, the choice of topics, the proofs, and the selection of problems in [6]. We would like to explicitly acknowledge those tests that had the most profound influence. These include Benedetto and Czaja [2], Bruckner, Bruckner, and Thomson [3], Folland [5], Rudin [8], Stein and Shakarchi [11], and Wheeden and Zygmund [13]. I greatly appreciate all of these texts and encourage the reader to consult them. Many additional texts and papers are listed in the references to [6].
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Heil, C. (2021). Absolute Continuity and the Banach–Zaretsky Theorem. In: Hirn, M., Li, S., Okoudjou, K.A., Saliani, S., Yilmaz, Ö. (eds) Excursions in Harmonic Analysis, Volume 6. Applied and Numerical Harmonic Analysis. Birkhäuser, Cham. https://doi.org/10.1007/978-3-030-69637-5_2
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DOI: https://doi.org/10.1007/978-3-030-69637-5_2
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