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This paper is concerned with the defect index of singular symmetric linear difference equations of order 2n with real coefficients and one singular endpoint. We show that their defect index d satisfies the inequalities n ≤ d ≤ 2n and that all values of d in this range are realized. This parallels the well known result of Glazman for differential equations established about 1950. In addition, several criteria of the limit point and strong limit point cases are established.

The defect index of singular symmetric linear difference equations with real coefficients