%0 Generic %A Labovskiy Sergey M. %D 2020 %F acta:70936 %K Differenciálegyenlet %N 52 %T On discreteness of spectrum of a second order differential operator %U http://acta.bibl.u-szeged.hu/70936/ %X A new form of a necessary and sufficient conditions for the discreteness of the spectrum of singular operator − 1 ρ(x) (p(x)u 0 0 , −∞ ≤ a ≤ x ≤ b ≤ +∞ is obtained. A simpler proof of the necessity is obtained. %Z Bibliogr.: 9. p. ; összefoglalás angol nyelven