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A Radical Approach to Lebesgue's Theory of Integration by David M. Bressoud

By David M. Bressoud

This vigorous advent to degree idea and Lebesgue integration is stimulated by way of the old questions that ended in its improvement. the writer stresses the unique function of the definitions and theorems, highlighting the problems mathematicians encountered as those rules have been sophisticated. the tale starts off with Riemann's definition of the essential, after which follows the efforts of these who wrestled with the problems inherent in it, until eventually Lebesgue eventually broke with Riemann's definition. together with his new method of realizing integration, Lebesgue opened the door to clean and effective ways to the formerly intractable difficulties of research.

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Extra resources for A Radical Approach to Lebesgue's Theory of Integration (Mathematical Association of America Textbooks)

Example text

But this work will be worth it, for it produces a very useful test for integrability. 2 (Darboux Integrability Condition). Let f be a bounded function on [a, b]. This function is Riemann integrable over this interval upper and lower Darboux integrals are equal. if and only if the Proof We take the easy direction first. 11 to prove that f b 1 -b /(x)dx < [(x)dx. It follows that for any partition P, we have S(P; f) < f b 1 -b a [(x) dx < [(x) dx < S(P; f). 4) Definition: Upper and lower Darboux integrals Let P denote the set of all partitions of [a, b].

If f is continuous over the closed and bounded interval [a, b], then it is uniformly continuous over this interval. 6). If f is a con- tinuous function on the closed, bounded interval [a, b], then f is integrable over [a,b]. 8). Let f be a bounded inte- grable function on [a, b] and define F for x in [a, b] by =[ F(x) f(t) dt. Then F is continuous at every point between a and b. 1. Give an example of a function and an interval for which the function is continuous but not uniformly continuous on the interval.

X~ E [Xn-l, Xn]. The Riemann n L f(xj) (Xj - xj-d. j=l Using the Cauchy criterion for convergence, the value V will exist if given any E > 0, there is a response 8 > 0 so that any two Riemann sums with intervals of length less than 8 will differ by less than E. The value of the integral is denoted by v= l b f(x) dx. The greatest difficulty with this definition is handling the variability in the tags of f since xj can be any value in the interval [x j-l, Xj]' Darboux saw that the way to do this is to work with the least upper bound2 (or supremum) and the greatest lower bound (or infimum) of the set {f(x) I Xj-l < X < Xj}' Every Riemann sum for this partition lies between the upper and lower Darboux sums (see top of next page).

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