1) Let A be the family of everywhere-defined real functions f so that lim f(x) = 0. x →∞ Decide whether A is an algebra of functions. Show that your answer is correct.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.1: Infinite Sequences And Summation Notation
Problem 73E
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Justify your answers briefly for: 

1) Let A be the family of everywhere-defined real functions f so that lim f(x) = 0.
x →∞
Decide whether A is an algebra of functions. Show that your answer is
correct.
2) Explain why the set {(x, y): 0≤x≤ 1, y = 1-x} is sequentially com-
pact in R2.
3) Give an example of an alternating series that diverges.
Transcribed Image Text:1) Let A be the family of everywhere-defined real functions f so that lim f(x) = 0. x →∞ Decide whether A is an algebra of functions. Show that your answer is correct. 2) Explain why the set {(x, y): 0≤x≤ 1, y = 1-x} is sequentially com- pact in R2. 3) Give an example of an alternating series that diverges.
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