Browsing by Subject "joint essential spectrum"

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Certain Properties Involving the Joint Essential Numerical Ranges

Sakwa, Cyprian O. (2020)

The concept of essential numerical range of an operator was dened and studied by Stamp i and Williams in 1972. Researchers generalised this idea of essential numerical range to a group of operators to the joint essential ...
On relation between the joint essential spectrum and the joint essential numerical range of aluthge transform

Sakwa, Cyprian O. (2021-08-13)

Associated with every commuting m-tuples of operators on a complex Hilbert space X is its Aluthge transform. In this paper we show that every commuting m-tuples of operators on a complex Hilbert space X and its Aluthge ...

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