Suppose P = L(V) is such that P² = P. Prove that there is a subspace U of V such that P Pu if and only if P is self-adjoint. =

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
Publisher:Ron Larson
Chapter4: Vector Spaces
Section4.2: Vector Spaces
Problem 43E: Prove that in a given vector space V, the zero vector is unique.
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Could you explain how to show this in detail? It is from the book "Linear algebra done right" by Axler

Suppose P = L(V) is such that P² = P. Prove that there is a subspace
U of V such that P
Pu if and only if P is self-adjoint.
=
Transcribed Image Text:Suppose P = L(V) is such that P² = P. Prove that there is a subspace U of V such that P Pu if and only if P is self-adjoint. =
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