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George Bray

George Bray

Answered question

2022-06-25

1) Suppose B = ( w 1 , w 2 , , w k , v 1 , , v n k ) is a basis for V and W = Span ( w 1 , , w k ) is T-invariant. What does the matrix of T with respect to B look like?
2) Suppose V is the direct sum of W 1 and W 2 , with W 1 , W 2 both T-invariant. If B = ( u 1 , u 2 , , u n , z 1 , z 2 , , z n ) is a basis for V with the u's being a basis for W 1 and the z's being a basis for W 2 , what does the matrix of T with respect to B look like?

Answer & Explanation

Aaron Everett

Aaron Everett

Beginner2022-06-26Added 18 answers

The columns of your matrix tell you what vectors your basis get sent to under T. So, in your first problem, if W is T invariant, then for each 1 i k
T ( w i ) = a 1 w 1 + + a k w k + 0 v 1 + 0 v 2 + + 0 v n k .
Thus the ith column of your matrix will be
( a 1 a 2 a k 0 0 0 )
for 1 i k . The columns corresponding to the v i have no restrictions.
For your second question the columns for the u i will have this form. The columns for the z i will have 0's on top.

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