Let $A$ be an $n \times n$ Hermitian matrix and let $A = UDU^*$ be its eigendecomposition. Then what can we say about the Hermitian matrix $B$ where $U = \exp(iB)$? Can we relate it to $A$ in some manner other than the one above mentioned?
2026-03-26 07:38:53.1774510733
Matrix logarithm of unitary matrix from eigendecomposition of Hermitian matrix
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