An open question which was asked by I. M. Glazman is answered. It is well known that the conditionlim x2"'1 r-1 = 0X.00 J Xis sufficient for the discreteness and boundedness from below of thespectrum of selfadjoint extensions of (l)n(ry- This papershows that the condition is also necessary. © 1974 American Mathematical Society.
