Let T be Hermitian or skew-Hermitian. Let and be distinct eigenvalues of T with corresponding eigenvectors x and y. Then x and y are orthogonal, namely,
From
and
we have
If T is Hermitian, then and so that
However, so that .
If T is skew-Hermitian, then and so that
However, so that . QED.
Tags: corresponding to, with corresponding, distinct, corresponding, eigenvectors, orthogonality, eigenvalues