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Jul 13, 2020 at 20:32 comment added Deane Yang @FedorPetrov, yes. That's correct.
Jul 13, 2020 at 19:31 comment added Fedor Petrov my question was: where is it used in your answer? Probably the answer is that you include the proof but not the formulation.
Jul 13, 2020 at 18:25 history edited Deane Yang CC BY-SA 4.0
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Jul 13, 2020 at 17:56 comment added Deane Yang @FedorPetrov, variants of this argument are commonly used to compare the behavior of geodesics on a Riemannian manifold to those on a manifold with constant curvature. But the argument itself was originally developed in what's known as Sturm-Liouville theory. It appears in many ODE textbooks.
Jul 13, 2020 at 17:52 comment added Fedor Petrov And where is it used? The argument looks self-contained.
Jul 13, 2020 at 17:51 comment added Deane Yang @FedorPetrov, it compares solutions to self-adjoint 2nd order ODEs. I never actually remember the precise statement of the theorem, so I adapt the relatively elementary argument to each particular situation.
Jul 13, 2020 at 17:46 comment added Fedor Petrov What is "Sturm comparison theorem"?
Jul 13, 2020 at 17:42 history answered Deane Yang CC BY-SA 4.0