Let $X$ be a symmetric $n\times n$ matrix and $Y$ an $n\times n$ matrix. Are there conditions which forces $\det (X+Y) = \det X + \det Y$. Any comments, references are appreciated. Thank you.
2026-04-06 22:36:34.1775514994
When is $\det (X+Y) = \det X + \det Y$
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