most citedNegativity-preserving transforms of tuples of symmetric matrices

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math.CA2026

Distance preservers for Lobachevsky space

Alexander Belton, Dominique Guillot, Apoorva Khare +1

We obtain a complete description of the class of entrywise preservers of Lorentz-Gram matrices. This resolves, for the case of constant negative curvature, the classification of en…

math.CA2026★ 1 cited

Negativity-preserving transforms of tuples of symmetric matrices

Alexander Belton, Dominique Guillot, Apoorva Khare +1

Compared to the entrywise transforms which preserve positive semidefiniteness, those leaving invariant the inertia of symmetric matrices reveal a surprising rigidity. We first obta…