2 problems

Let $\psi_k^{(0)}\rangle$ be the basis of eigenfunctions of the unperturbed system, and let $A_i(n,{\mathbf L};v)$ denote the normalized coefficient quantity for the corresponding…

A Šeba-class system is an integrable system perturbed by a point singularity or in an analogous manner; the relevant spectral and eigenfunction quantities are those studied for qua…