: Theorem 4.4.5 (Sequential Criterion for Absence of Uniform Conti- nuity). A function f AR fails to be uniformly continuous on A if and only if there exists a particular eo > 0 and two sequences (xn) and (yn) in A satisfying xn - Yn → 0 but|f(xn) — f(yn)|≥ €0. Exercise 4.4.1. (a) Show that f(x) = x³ is continuous on all of R. (b) Argue, using Theorem 4.4.5, that f is not uniformly continuous on R. (c) Show that f is uniformly continuous on any bounded subset of R.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.5: Permutations And Inverses
Problem 5E: Let f:AA, where A is nonempty. Prove that f a has right inverse if and only if f(f1(T))=T for every...
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Theorem 4.4.5 (Sequential Criterion for Absence of Uniform Conti-
nuity). A function f AR fails to be uniformly continuous on A if and
only if there exists a particular eo > 0 and two sequences (xn) and (yn) in A
satisfying
xn - Yn → 0
but|f(xn) — f(yn)|≥ €0.
Transcribed Image Text:: Theorem 4.4.5 (Sequential Criterion for Absence of Uniform Conti- nuity). A function f AR fails to be uniformly continuous on A if and only if there exists a particular eo > 0 and two sequences (xn) and (yn) in A satisfying xn - Yn → 0 but|f(xn) — f(yn)|≥ €0.
Exercise 4.4.1. (a) Show that f(x) = x³ is continuous on all of R.
(b) Argue, using Theorem 4.4.5, that f is not uniformly continuous on R.
(c) Show that f is uniformly continuous on any bounded subset of R.
Transcribed Image Text:Exercise 4.4.1. (a) Show that f(x) = x³ is continuous on all of R. (b) Argue, using Theorem 4.4.5, that f is not uniformly continuous on R. (c) Show that f is uniformly continuous on any bounded subset of R.
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