Calculation of the spectrum of a Hamiltonian matrix is reported.
The matrix is sparse (with the 112-dimensional sample of its
structure given in Figure 1) and its spectrum does not seem to
converge with the growing cutoff B (cf. Figure 2). It is
conjectured that those particular elements of the numerical
spectrum which converge, correspond to localized states which may
be identified via an evaluation of a certain test function. This
is illustrated in Figure 3 which, I must admit, did not persuade
me completely (apparently, at least one of the non-localized
states does not look incompatible with the test criterion).

MR2276748 Kotanski, Jan Virial theorem for four-dimensional supersymmetric Yang-Mills quantum mechanics with SU(2) gauge group. Acta Phys. Polon. B 37 (2006), no. 12, 3659--3666. 81Q60