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Aug 12, 2013 at 21:58 comment added Malabarba I find it hard to understand what you're asking. What do you mean by least upper bounds? Are looking for a system whose energy is bounded above and below? If so, the hydrogen atom is an example.
Aug 12, 2013 at 20:31 answer added Dave timeline score: 2
Aug 12, 2013 at 19:12 history asked Mr X CC BY-SA 3.0