Ospanov, K. N., L.N. Gumilyov Eurasian National University, Kazakhstan, Nur-Sultan, Kazakhstan
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Journal of Mathematics, Mechanics and Computer Science Vol. 110 No. 2 (2021): Journal of Mathematics, Mechanics and Computer Science - Mathematics
THE TWO-SIDED ESTIMATES OF THE FREDHOLM RADIUS AND COMPACTNESS CONDITIONS FOR THE OPERATOR ASSOCIATED WITH A SECOND-ORDER DIFFERENTIAL EQUATION
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