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Schur null preserving maps

2019/09/03 by Ying‐Fen Lin, Lin, Ying-Fen, Donal O'Cofaigh +1
Mathematics · #Advanced Topics in Algebra #Advanced Operator Algebra Research #Holomorphic and Operator Theory

paper · pdf · doi:10.48550/arxiv.1909.01041

Abstract

We provide a characterisation of Schur multiplicative maps on both finite and infinite dimensional matrix spaces, and show that every surjective Schur multiplicative contraction is automatically an isometry. We also generalise this result and provide a characterisation of Schur null preserving maps on m× n matrices and on Schur multipliers.

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