Ononot — Hadamard's inequality states that for an n\times n matrix A

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Hadamard's inequality states that for an $n\times n$ matrix $A$ with columns $\mathbf{c}_1, \ldots, \mathbf{c}_n$ : $|\det(A)| \leq \|\mathbf{c}_1\| \cdot \|\mathbf{c}_2\| \cdots \|\mathbf{c}_n\|$ Which statement about equality in Hadamard's inequality is correct?