Geodesic
About differential operators and matrices of the second order
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 15 (2015) no. 1, pp. 31-37.

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Differential operators of the second order are studied. Conditions of their invertibility are obtained. The main results are obtained on the comparison of the operator matrix of the second order with the researching operator. 
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A. Yu. Duplishcheva. About differential operators and matrices of the second order. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 15 (2015) no. 1, pp. 31-37. http://geodesic.mathdoc.fr/item/ISU_2015_15_1_a4/

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