Numerical index with respect to an operator, By Mohammad ali Ardalani

Research

Title	Numerical index with respect to an operator
Type	JournalPaper
Keywords	numerical range,numerical radius, numerical index, spear
Year	2014
Journal	Studia Mathematica
DOI
Researchers	Mohammad ali Ardalani

Abstract

In this paper we introduce new concepts of numerical range and numerical radius of one operator with respect to another one, that generalize in a natural way the known concepts of numerical range and numerical radius. We study basic properties of these new concepts and present some examples