Abstract
Assume that A is a tridiagonal operator on l 2 (N), dened by Aej = ej 1 + ( 1) j ej+1;j = 1; 2; , where fe1;e2;e3; g is the standard orthonormal basis for l 2 (N). In 2011, M. Chien and H. Nakazato have studied the numerical range of these type of tridiagonal operators. In this paper we give another prove of the results.
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