Let Y be a subspace of a Banach space X, and let the norm on Y be the restriction of the norm on X to the set Y. Then Y is a Banach space with respect to this norm if and only if Y is a closed subset of X. porove Lemma To give an application of Lemma 3.4.4, let co be the set of all sequences of scalars that “vanish at infinity," i.e., {x = (xk)kEN : lim k = - 아. Co = (3.18) The reader should check that we have the inclusions う%うaう ,う 00p 1

Elementary Linear Algebra (MindTap Course List)
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Chapter4: Vector Spaces
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Let Y be a subspace of a Banach space X, and let the norm
on Y be the restriction of the norm on X to the set Y. Then Y is a Banach
porove Lemma
space with respect to this norm if and only if Y is a closed subset of X.
To give an application of Lemma 3.4.4, let co be the set of all sequences
of scalars that "vanish at infinity," i.e.,
{x = (xk)kEN : lim ak =
-아.
Co =
(3.18)
The reader should check that we have the inclusions
1<p< o.
We will use Lemma 3.4.4 to prove that co is a Banach space with respect to
the norm of l.
Transcribed Image Text:Let Y be a subspace of a Banach space X, and let the norm on Y be the restriction of the norm on X to the set Y. Then Y is a Banach porove Lemma space with respect to this norm if and only if Y is a closed subset of X. To give an application of Lemma 3.4.4, let co be the set of all sequences of scalars that "vanish at infinity," i.e., {x = (xk)kEN : lim ak = -아. Co = (3.18) The reader should check that we have the inclusions 1<p< o. We will use Lemma 3.4.4 to prove that co is a Banach space with respect to the norm of l.
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