Spectral inclusion by the quadratic numerical range of $2\times2$ operator matrices with unbounded entries

Jie Liu, Junjie Huang, Alatancang Chen

Abstract


This paper deals with the spectral inclusion properties of $2\times2$ operator matrices with unbounded entries in Hilbert space. The conditions for spectral inclusion by the quadratic numerical range  are described. In addition, some examples are given to illustrate the main results.

Refbacks

  • There are currently no refbacks.