not just discrete.
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Under suitable conditions, the above equations have a set of solutions
$\Psi_\ell,\varepsilon_\ell$, $\ell\in {\cal I}$, where $\cal I$ can
-be a finite or infinite set. In either case, let us note that there is
+be a finite or infinite set (and in the latter case it may be a discrete or
+sometimes at least in part a continuous set). In either case, let us note that
+there is
no longer just a single solution, but a set of solutions (the various
eigenfunctions and corresponding eigenvalues) that we want to
compute. The problem of numerically finding all eigenvalues
In the beginning the Universe was created. This has made a lot of
people very angry and has been widely regarded as a bad move.
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