Let T be a linear operator on a finite-dimensional vector space V. Prove the following results. (a) N(T∗T) = N(T). Deduce that rank(T∗T) = rank(T). (b) rank(T) = rank(T∗). Deduce from (a) that rank(TT∗) = rank(T). (c) For any n ×n matrix A, rank(A∗A) = rank(AA∗) = rank(A).

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.6: The Matrix Of A Linear Transformation
Problem 43EQ
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Let T be a linear operator on a finite-dimensional vector space V. Prove the following results.

(a) N(T∗T) = N(T). Deduce that rank(T∗T) = rank(T).

(b) rank(T) = rank(T∗). Deduce from (a) that rank(TT∗) = rank(T).

(c) For any n ×n matrix A, rank(A∗A) = rank(AA∗) = rank(A).

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