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Jun 5, 2011 at 14:18 vote accept jsb
Jun 4, 2011 at 8:57 comment added Piero D'Ancona Why don't you just leaf through one of the hundreds of books on spectral theory and/or theory of operators (e.g., Reed and Simon's treatise)? a large part of the theory is devoted to answer precisely this question
Jun 4, 2011 at 7:34 answer added Michael Renardy timeline score: 6
Jun 4, 2011 at 6:35 history asked jsb CC BY-SA 3.0