Can I see separation variableof variables as a tensor product? For example, in a radial potential, the separation of variablevariables brings to the solution $R(r)\Theta(\theta) \Phi (\phi)$. This sounds like an element of the space spanned by $|r\rangle\otimes|\theta\rangle\otimes |\phi\rangle$ where $R(r)$ lives in the space spanned by $|R\rangle$ and so on.
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