Question: Computation of geodesic connecting two points on a surface embedded in R^3

Respected members!

I downloaded this file because I've to study the geodesics over the cone, the sphere and the cylinder (and in general on a Riemannian manifold). But when I modify the equation, putting one of that I'm interested to, the file doesn't work (for example, it doesn't recognize the "assign" command). Could you help me, please?\GeodesicsSurface.pdf



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