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Dec 5, 2014 at 17:19 answer added Robert Bryant timeline score: 3
Dec 5, 2014 at 14:45 comment added Robert Bryant @Slm2004: Ah! I see that I made a mistake in my calculations. You are right, the general solution in this particular case is $f = ax+by$ where $a$ and $b$ are constants, so there are two solutions, as you said.
Dec 5, 2014 at 13:56 comment added Slm2004 @RobertBryant. Thank you for your attentiona. Yes. It does exist a nontrivial one when $M$ is the unit disk with Euclidean metric. Actually there are two linear independently solutions of the corresponding problem. Someone told me this is related to stelov eigenvalue problem. I am looking for the reference on it but have not known how to prove this yet.
Dec 3, 2014 at 15:36 comment added Robert Bryant There is not a nonzero solution $f$ even when $M$ is the unit disk in the Euclidean plane (i.e., $K=0$, $\kappa = 1$), so it would appear that nontrivial solutions only exist in special cases.
Dec 3, 2014 at 3:08 comment added Igor Rivin Why is there a solution if you drop the second condition?
Dec 2, 2014 at 20:51 history asked Slm2004 CC BY-SA 3.0