Hermitian matrices have real eigenvalues.

Created almost 9 years ago, updated 6 months ago

Theorem: Hermitian matrices have real eigenvalues. Proof: If $Av = \lambda v$ with $v \neq 0$, then $v^*Av = \lambda v^*v$ and also $v^*Av = v^*A^*v = (Av)^*v = \overline{\lambda}v^*v$. So $\lambda = \overline{\lambda}$, meaning $\lambda$ is real.

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