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Jan 9, 2023 at 23:07 comment added Deane Yang You should prove that yourself.
Jan 9, 2023 at 22:50 comment added Steve Thanks for the explanation. I knew that you can get a Jacobi field by differentiating a family of geodesics (w.r.t. the appropriate parameter). I.e., that operation yields a vector field satisfying the Jacobi equation (which I take to be the definition of a Jacobi field). I was unsure whether the converse is true, i.e., if you have a vector field satisfying the Jacobi equation then there exists a family of geodesics, etc. I guess the answer is "yes".
Jan 8, 2023 at 16:52 history answered Deane Yang CC BY-SA 4.0