3. Let T: V→ V be a linear operator on a finite-dimensional vector space V. Let B = {₁,..., Un} be an ordered basis for V. Let k be an integer with 0

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Chapter2: Second-order Linear Odes
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3. Let T: V→ V be a linear operator on a finite-dimensional vector space V. Let
B = {₁,..., Un} be an ordered basis for V. Let k be an integer with 0 <k <n,
and let ₁ = {₁,..., Uk}, B₂ = {Uk+1,..., Un}, W₁ = span(3₁), and W₂ = span(3₂).
Show that the following two conditions are equivalent.
(a) The matrix [T] is block diagonal of the form
[T]₁ = ({
0
0 A₂
for some k x k matrix A₁ and some (n - k) × (n − k) matrix A₂.
(b) Both W₁ and W₂ are T-invariant subspaces of V.
Moreover, show that when these conditions are satisfied, we have A₁ = [Tw₁]₁ and
A2 = [Tw₂]8₂.
Transcribed Image Text:3. Let T: V→ V be a linear operator on a finite-dimensional vector space V. Let B = {₁,..., Un} be an ordered basis for V. Let k be an integer with 0 <k <n, and let ₁ = {₁,..., Uk}, B₂ = {Uk+1,..., Un}, W₁ = span(3₁), and W₂ = span(3₂). Show that the following two conditions are equivalent. (a) The matrix [T] is block diagonal of the form [T]₁ = ({ 0 0 A₂ for some k x k matrix A₁ and some (n - k) × (n − k) matrix A₂. (b) Both W₁ and W₂ are T-invariant subspaces of V. Moreover, show that when these conditions are satisfied, we have A₁ = [Tw₁]₁ and A2 = [Tw₂]8₂.
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