Riemann-Stieltjes and Lebesgue Integrals

Author: Andrew Terker [ profile | email ]

Abstract

The idea of integration has been around since the time of Archimedes, but it has been said that "the theory of integration was a creation of the twentieth century." In 1854 Georg F.B. Riemann gave a set of necessary and sufficient conditions under which a bounded function is said to be integrable. Today, a function of this type is known as being "Riemann integrable" and almost every undergraduate student who has taken a calculus course has learned about this form of integration. Riemann dominated the field of integration until 1894 when a Dutch mathematician named Thoman Jan Stieltjes developed the Riemann- Stieltjes integral while investigating a very specific problem concerning a thin rod of nonuniformly distibuted mass. This specific problem called for the development of the first generalized form of the Riemann integral. Shortly after this, Henri Lebesge developed a generalization of this generalization which soon dominated studies in measure theory and integration and remain prominant ideas of mathematical analysis today.

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