Abstract
ABSTRACTLet H be a complex Hilbert space and let be an n-tuple of self-adjoint operators on H. The joint numerical range of is the setBy a result of Li and Poon, the closure of , denoted by , is star-shaped with each point in the joint essential numerical range of a star centre. In this note, we give a few observations about the boundary of and basing on their results.
Full Text 
Sign-in/Register to access full text options
Sign-in/Register to access full text options 
Published version (
Free)
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
