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Oct 1, 2014 at 19:51 comment added Frédéric @ChrisGerig I think he means it in the context of the Hydrogen atom Hamiltonian, although I don't see the direct connection to the original question, as $\hat K$ and $1/\hat r$ do not mix at first glance. I would be glad if Alex could elaborate.
Oct 1, 2014 at 19:44 comment added Chris Gerig ...What is your elementary system / Hamiltonian? It can't be just $\hat{K}$ because that is a free particle, and subsequently this is irrelevant to the question!
Oct 1, 2014 at 19:40 history answered Alex Nelson CC BY-SA 3.0