Geodesic
On some formulas for the index of linear bounded operator
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2009), pp. 3-9

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We consider the linear bounded operator in infinite dimensional separable Hilbert space satisfying some conditions. We prove formulas that can be used to calculate the index of this operator.
Keywords: operator, index, trace, absolute norm. 
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I. G. Khachatryan. On some formulas for the index of linear bounded operator. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2009), pp. 3-9. http://geodesic.mathdoc.fr/item/UZERU_2009_3_a0/