Prove that then the sequence {"(1+i) belongs to l1. n3"

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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• Exercise 1 Assume that:
a) The sequence
{} belongs to l2.
b) The sequence {} belongs to l2.
Prove that then the sequence {
e-in (1+i)
n3"
belongs to l1.
You can only use without proof that:
i) The Cauchy-Schwarz inequality holds.
ii) An increasing sequence of real numbers which is bounded above must converge.
Transcribed Image Text:• Exercise 1 Assume that: a) The sequence {} belongs to l2. b) The sequence {} belongs to l2. Prove that then the sequence { e-in (1+i) n3" belongs to l1. You can only use without proof that: i) The Cauchy-Schwarz inequality holds. ii) An increasing sequence of real numbers which is bounded above must converge.
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