On the boundary of theC-numerical range of a normal matrix
Natália Bebiano, João da Providência · Linear and Multilinear Algebra · 1988
Let A be an n × n normal matrix and an n-tuple of complex numbers. The c-numerical range, denoted by Wc (A), is the set of the points run over all the orthonormal complex columns. This paper studies the boundary of Wc (A).