%A  Labovskiy Sergey M.
%N 52
%D 2020
%L acta70936
%O Bibliogr.: 9. p. ; ĂśsszefoglalĂĄs angol nyelven
%K DifferenciĂĄlegyenlet
%T On discreteness of spectrum of a second order differential operator
%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.