Abstract
The concept of a numerical range is a natural extension of quadratic forms studied in linear algebra. To be more precise, the numerical range of a bounded linear operator A on a complex Hilbert space (H), to be denoted by W(A), is defined as the range of the continuous mapping (formula presented) defined on the unit sphere of the Hilbert space (H), that is, The study of numerical range assists in understanding the behavior of a bounded linear operator.