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Jul 19, 2020 at 0:08 history edited Robert Bryant CC BY-SA 4.0
edited body
Jul 18, 2020 at 20:30 history edited Robert Bryant CC BY-SA 4.0
Added a remark about the nature of the equations on $\phi$ in the generic case.
Jul 18, 2020 at 20:22 history answered Robert Bryant CC BY-SA 4.0