Subdifferential of the joint numerical radius [article]

Priyanka Grover, Sushil Singla
2022
An expression for the subdifferential of the joint numerical radius is obtained. Its applications to the best approximation problems in the joint numerical radius are discussed.
doi:10.48550/arxiv.2201.03055 fatcat:hxo5dgdwpvh4hdaq3eaiywrb5m