Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 9 - Infinite Series - 9.2 Monotone Sequences - Exercises Set 9.2 - Page 613: 13

Answer

True

Work Step by Step

We're given the statement: If \(\forall n \geq 1, \, a_{n+1} - a_n > 0\), then the sequence \(\{a_n\}\) is strictly increasing. We're asked to determine whether the statement is true or false. Let \(\{a_n\} = \{a_n\}_{n=1}^\infty\) be the sequence, and let \(f\) be a function such that the \(n\)th term in the sequence is \(a_n = f(n)\). We know that \(a_{n+1} > a_n\) for all \(n\), hence, we have that \(f(n) = a_n < a_{n+1} = f(n+1)\). Thus, \(f(n+1)>f(n)\), which means that the function is strictly increasing. Result: \[TRUE\]
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