5. Let {an} be a sequence of real numbers with an infinite number of values. (That is, there is no finite set A such that an € A for all n.) Prove that {an} has a subsequence that is either strictly increasing or strictly decreasing.

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 72E
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5. Let {an} be a sequence of real numbers with an infinite number of values.
(That is, there is no finite set A such that an EA for all n.) Prove that {an}
has a subsequence that is either strictly increasing or strictly decreasing.
Transcribed Image Text:5. Let {an} be a sequence of real numbers with an infinite number of values. (That is, there is no finite set A such that an EA for all n.) Prove that {an} has a subsequence that is either strictly increasing or strictly decreasing.
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