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In the present paper we study the Riesz summability on a closed domain expansions in eigenfunctions of the first boundary value problem for the Schrodinger operator with a weak singular potential.Filomat 33:16 (2019), 5199–5205 https: //doi.org /10.2298 /FIL1916199RPublished by Faculty of Sciences and Mathematics, University of Ni ˇs, Serbia Ava