6. Let V be a vector space and let U1 and U2 be subspaces of V. Show that if U1 U U2 is a subspace of V then either U1 C U2 or U2 C U1. Hint: Show that if U1 is not contained in U2 and U2 is not contained in U1 then U1 U U2 is not closed under addition.

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
Publisher:Ron Larson
Chapter5: Inner Product Spaces
Section5.CM: Cumulative Review
Problem 24CM
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Provide a step by step complete proof of the following question:

6.
Let V be a vector space and let U1 and U, be subspaces of V.
Show that if U1U U2 is a subspace of V then either U1 C U2 or U2 C U1.
Hint: Show that if U1 is not contained in U2 and U2 is not contained in U1 then U1 U U2 is not
closed under addition.
Transcribed Image Text:6. Let V be a vector space and let U1 and U, be subspaces of V. Show that if U1U U2 is a subspace of V then either U1 C U2 or U2 C U1. Hint: Show that if U1 is not contained in U2 and U2 is not contained in U1 then U1 U U2 is not closed under addition.
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