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Apr 11, 2017 at 11:38 comment added Carlo Beenakker while semiclassics will certainly give a reliable estimate on the energy level, I have not seen this method capable of giving a rigorous lower bound (for upper bounds one has the Rayleigh-Ritz variational treatment, lower bounds are much more tricky)
Apr 11, 2017 at 11:06 history answered Denis Serre CC BY-SA 3.0