Let U be a unitary operator on an inner product space V, and let W be a finite-dimensional U-invariant subspace of V. Prove that (a) U(W) = W;(b) W⊥ is U-invariant.

Elementary Linear Algebra (MindTap Course List)
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Chapter4: Vector Spaces
Section4.CR: Review Exercises
Problem 19CR: Determine Subspaces In Exercises 17-24, determine whether W is a subspace of the vector space V....
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Let U be a unitary operator on an inner product space V, and let W be a finite-dimensional U-invariant subspace of V. Prove that (a) U(W) = W;(b) W⊥ is U-invariant.

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