Let T be a linear operator on a finite dimensional vector space V, and Let W1,W2,.....Wk be T invariant subspaces of V such that V =W1+W2+.....WK. Prove that T is diagonalizable  if and only if Twi is diagonalizable for all I.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.3: Change Of Basis
Problem 22EQ
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Let T be a linear operator on a finite dimensional vector space V, and Let W1,W2,.....Wbe T invariant subspaces of V such that V =W1+W2+.....WK. Prove that T is diagonalizable  if and only if Twi is diagonalizable for all I.

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