Schur null preserving maps
Functional Analysis
2019-09-04 v1 Operator Algebras
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 matrices and on Schur multipliers.
Keywords
Cite
@article{arxiv.1909.01041,
title = {Schur null preserving maps},
author = {Ying-Fen Lin and Donal O'Cofaigh},
journal= {arXiv preprint arXiv:1909.01041},
year = {2019}
}