3. Suppose f, g:D → R continuous on D. are uniformly continuous on D. Prove that f + g is uniformly

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.2: Mappings
Problem 18E: 18. Let and be defined as follows. In each case, compute for arbitrary . a. b. c. d. e.
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I need help with #3 and #4.
1. Use the definition to prove that the function in f(x) = 2r – 3 is uniformly continuous.
2. Use the definition to prove f = is uniformly continuous on [0, 00).
3. Suppose f, g : D → R are uniformly continuous on D. Prove that f + g is uniformly
continuous on D.
4. Let f : X → Y and g : Y → Z be uniformly continuous on X and Y, respectively.
Prove gof : X → Z is uniformly continuous on X.
5. Definition: A function f : R → R is periodic if there exists k > 0 such that
f(r + k) = f(x) for all z € R (e.g., sin(r + 2ñ) = sin x).
If f : R → R is continuous and periodic, prove that f is uniformly continuous.
Hint: Show that ƒ is uniformly continuous on [-k, k] and then use the definition of
uniformly continuous to show that f is uniformly continuous on R.
Transcribed Image Text:1. Use the definition to prove that the function in f(x) = 2r – 3 is uniformly continuous. 2. Use the definition to prove f = is uniformly continuous on [0, 00). 3. Suppose f, g : D → R are uniformly continuous on D. Prove that f + g is uniformly continuous on D. 4. Let f : X → Y and g : Y → Z be uniformly continuous on X and Y, respectively. Prove gof : X → Z is uniformly continuous on X. 5. Definition: A function f : R → R is periodic if there exists k > 0 such that f(r + k) = f(x) for all z € R (e.g., sin(r + 2ñ) = sin x). If f : R → R is continuous and periodic, prove that f is uniformly continuous. Hint: Show that ƒ is uniformly continuous on [-k, k] and then use the definition of uniformly continuous to show that f is uniformly continuous on R.
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