NUMERICAL RANGE an‎d SUB-SELF-ADJOINT OPERATORS

In this paper, we show that the numerical range of a bounded linear operator T on a complex Hilbert space is a line segment if and only if there are scalars λ and µ such that T ∗ = λT + µI, and we determine the equation of the straight support of this numerical range in terms of λ and µ. An operator T is called sub-self-adjoint if their numerical range is a line segment. The class of sub-self-adjoint operators contains every self-adjoint operator and contained in the class of normal operators. We show that this class is uniformly closed, invariant under unitary equivalence and invariant under affine transformation. Some properties of the sub-self-adjoint operators and their numerical ranges are investigated.