Given U_1, ..., U_m, a collection of subspaces of some vector space V, recall that U_1 + ... + U_m is defined to be the space of all vectors which can be expressed as u_1 + ... + u_m where each u_k is a vector in the subspace U_k. Well U_1 + ... + U_m is called a direct sum if each of its vectors can be expressed uniquely as u_1 + ... + u_m. Give a specific example of a direct sum of vector subsp

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter3: Matrices
Section3.5: Subspaces, Basis, Dimension, And Rank
Problem 4EQ: In Exercises 1-4, let S be the collection of vectors in [xy]in2 that satisfy the given property. In...
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Given U_1, ..., U_m, a collection of subspaces of some vector space V, recall that U_1 + ... + U_m is defined to be the space of all vectors which can be expressed as u_1 + ... + u_m where each u_k is a vector in the subspace U_k. Well U_1 + ... + U_m is called a direct sum if each of its vectors can be expressed uniquely as u_1 + ... + u_m. Give a specific example of a direct sum of vector subspaces, and prove that your example is, indeed, a direct sum.

 

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