Let V be a vector space over R with subspaces U and W. (a) Show that U ∩ W is a subspace of V . (b) Give an example of V , U and W with the property that U ∪ W is not a subspace of V . (c) Is it true that U \ W = {u ∈ U | u ∈/ W} is a subspace of V ?

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
Publisher:Ron Larson
Chapter4: Vector Spaces
Section4.3: Subspaces Of Vector Spaces
Problem 56E: Give an example showing that the union of two subspaces of a vector space V is not necessarily a...
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Let
V be a vector space over
R with subspaces
U and
W. (a) Show that
U

W is a subspace of
V . (b) Give an example of
V , U and
W with the property that
U

W is not a subspace of
V . (c) Is it true that
U
\
W
= {u

U | u
∈/
W} is a
subspace of
V ?

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