(22) Wedenote by the space of all bounded sequences (a,)-1 For example, (1, -2,1, –2, 1,–2, ...) E . Define addition and scalar multiplication by (a,)+ (b,), = (an+ b„) and %3D c(an) = (ca,=1: a) Let |(a,.)l = supla,]. Show that | | is a norm on %3D b) Show that ( is complete with respect to this norm. In other words, prove ( is a Banach space.
(22) Wedenote by the space of all bounded sequences (a,)-1 For example, (1, -2,1, –2, 1,–2, ...) E . Define addition and scalar multiplication by (a,)+ (b,), = (an+ b„) and %3D c(an) = (ca,=1: a) Let |(a,.)l = supla,]. Show that | | is a norm on %3D b) Show that ( is complete with respect to this norm. In other words, prove ( is a Banach space.
Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
Publisher:Ron Larson
Chapter4: Vector Spaces
Section4.2: Vector Spaces
Problem 48E: Let R be the set of all infinite sequences of real numbers, with the operations...
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Question
We denote by ∞ the space of all bounded sequences (an)∞
n=1.
For example,
(1, −2, 1, −2, 1, −2,...) ∈ ∞ .
Define addition and scalar multiplication by
(an)
∞
n=1 + (bn)
∞
n=1 = (an + bn)
∞
n=1 and
c(an)
∞
n=1 = (can)
∞
n=1 .
a) Let ||(an)
∞
n=1|| = supn
|an|. Show that || · || is a norm on
∞.
b) Show that ∞ is complete with respect to this norm.
In other words, prove ∞ is a Banach space.
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