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24 - Between Rigor and Applications: Developments in the Concept of Function in Mathematical Analysis

from Part V - Mathematics, Astronomy, and Cosmology Since the Eighteenth Century

Published online by Cambridge University Press:  28 March 2008

By
Jesper Lützen
Edited by
Mary Jo Nye
Mary Jo Nye
Affiliation:
Oregon State University
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Summary

In this chapter I shall illustrate some of the general trends in the development of mathematical analysis by considering its most basic element: the concept of function. I shall show that its development was shaped both by applications in various domains, such as mechanics, electrical engineering, and quantum mechanics, and by foundational issues in pure mathematics, such as the striving for rigor in nineteenth-century analysis and the structural movement of the twentieth century. In particular, I shall concentrate on two great changes in the concept of function: first, the change from analytic-algebraic expressions to Dirichlet’s concept of a variable depending on another variable in an arbitrary way, and second, the invention of the theory of distributions. We shall see that it is characteristic of both of the new concepts that they were initiated in a nonrigorous way in connection with various applications, and that they were generally accepted and widely used only after a new basic trend in the foundation of mathematics had made them natural and rigorous. However, the two conceptual transformations differ in one important respect: The first change had a revolutionary character in that Dirichlet’s concept of function completely replaced the earlier one. Furthermore, some of the analytic expressions, such as divergent power series, which eighteenth-century mathematicians considered as functions, were considered as meaningless by their nineteenth-century successors. The concept of distributions, on the other hand, is a generalization of the concept of function in the sense that most functions (the locally integrable functions) can be considered distributions. Moreover, the theory of distributions builds upon the ordinary theory of functions, so that the theory of functions is neither superfluous nor meaningless.

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The Cambridge History of Science , pp. 468 - 487
Publisher: Cambridge University Press
Print publication year: 2002

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