Define a complex matrix B to be skew-Hermitian if Bh = −B. Show that if B is a complex matrix that is skew-Hermitian, and λ is an eigenvalue of B, then there is a real number b so that λ = ib.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.4: The Singular Value Decomposition
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Define a complex matrix B to be skew-Hermitian if
Bh = −B.
Show that if B is a complex matrix that is skew-Hermitian, and λ is an eigenvalue of B, then there is a real
number b so that λ = ib.

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