The spectrum of a matrix is invariant under transposition – math.stackexchange.com

Given a square matrix $A$, we denote the set of its eigenvalues with $\operatorname{Spec}(A)$. Is it true that $$ \operatorname{Spec}(A)=\operatorname{Spec}(A^T) $$ for every $A\in\mathcal M_n(\Bbb ...

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