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Symmetric Properties of Real Functions
Brian thomson
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eBook - ePub
Symmetric Properties of Real Functions
Brian thomson
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Ă propos de ce livre
This work offers detailed coverage of every important aspect of symmetric structures in function of a single real variable, providing a historical perspective, proofs and useful methods for addressing problems. It provides assistance for real analysis problems involving symmetric derivatives, symmetric continuity and local symmetric structure of sets or functions.
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Informations
1
The Derivative
1.1 Introduction
The first and second symmetric derivatives of a function f are defined by the expressions
The first of these is, on occasion, called Lebesgueâs derivative and the second Riemannâs derivative or Schwarzâs derivative. We begin our work with some classical studies of these derivatives. Although our concerns are broader than this, these studies provide us the opportunity to present many of the main themes and will lead us into the subject.
The first question that would obviously arise in a study of the symmetric derivatives is to ask how far properties of ordinary derivatives extend to symmetric derivatives. This is a natural starting point for our investigation and is the starting point taken by Khintchine [151] in 1927. This leads, by relatively familiar methods, to a number of elementary observations. We supplement this with several other important classical, but essentially elementary, results of Schwarz, Mazurkiewicz [197] and [198], and Auerbach [9]. The applications to trigonometric series that appear in Sections 1.4 and 1.7 remain among the central reasons why the subject has attracted attention.
The main result in Khintchineâs fundamental paper, the first really technically interesting result in the subject, appears in Section 1.10. This asks the question: does the existence of the symmetric derivative of a function f on a set E say anything about the ordinary differentiability properties of f on that set? The answer to this question will introduce us to some of the more subtle geometric arguments needed to study effectively this derivative in particular and symmetric properties of real functions in general.
1.2 Even and Odd Properties
1.2.1 The Even and Odd Parts of a Function
A function f is even if f(t) = f(ât) everywhere; a function f is odd if f(t) = âf(ât) everywhere. These conditions represent symmetries in the graph of the function, in the first case symmetry about the y-axis and in the second symmetry about the origin.
At any point x and for any function f we can study these symmetries in the ordinary difference
This difference can be written as
We shall employ the notations
Table des matiĂšres
- Cover
- Half Title
- Series Page
- Title Page
- Copyright Page
- Preface
- Table of Contents
- Original Half Title
- 1 THE DERIVATIVE
- 2 CONTINUITY
- 3 COVERING THEOREMS
- 4 EVEN PROPERTIES
- 5 MONOTONICITY
- 6 ODD PROPERTIES
- 7 THE SYMMETRIC DERIVATIVE
- 8 SYMMETRIC VARIATION
- 9 SYMMETRIC INTEGRALS
- APPENDIX
- PROBLEMS
- References
- Index
Normes de citation pour Symmetric Properties of Real Functions
APA 6 Citation
Thomson, B. (2020). Symmetric Properties of Real Functions (1st ed.). CRC Press. Retrieved from https://www.perlego.com/book/1692437/symmetric-properties-of-real-functions-pdf (Original work published 2020)
Chicago Citation
Thomson, Brian. (2020) 2020. Symmetric Properties of Real Functions. 1st ed. CRC Press. https://www.perlego.com/book/1692437/symmetric-properties-of-real-functions-pdf.
Harvard Citation
Thomson, B. (2020) Symmetric Properties of Real Functions. 1st edn. CRC Press. Available at: https://www.perlego.com/book/1692437/symmetric-properties-of-real-functions-pdf (Accessed: 14 October 2022).
MLA 7 Citation
Thomson, Brian. Symmetric Properties of Real Functions. 1st ed. CRC Press, 2020. Web. 14 Oct. 2022.