Subdifferential set of the joint numerical radius of a tuple of matrices
arXiv:2201.03055 · doi:10.1080/03081087.2022.2119194
Abstract
An expression for the subdifferential set of the joint numerical radius of a tuple of matrices is obtained. Its applications to the Birkhoff-James orthogonality in the space consisting of tuples of matrices equipped with the joint numerical radius norm are discussed.
arXiv commentThis is an original manuscript of an article published by Taylor & Francis in Linear and Multilinear Algebra on 21 Sep 2022, available online: https://doi.org/10.1080/03081087.2022.2119194