Let V be a finite-dimensional vector space over F, and suppose that T in L(V, V) has the property that every v in V is an eigenvector for T. Prove that T must then be a scalar multiple of the identity function on V.

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 V be a finite-dimensional vector space over F, and suppose that T in L(V, V) has the property that every v in V is an eigenvector for T. Prove that T must then be a scalar multiple of the identity function on V. 

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