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Unformatted text preview: Diﬀerential Geometry 2
Homework 03 1. Let S ⊂ V be the unit sphere in a Euclidean space. Recall that if γ is
V
S
a smooth curve in S then Dγ γ = (Dγ γ )T . Use this fact to determine the
˙˙
˙˙
(unitspeed) geodesics in S explicitly. Do the same for geodesics in hyperbolic
space H .
2. Let g be the standard Riemannian metric on the (punctured) plane R2 −{0}
on which the scalar function f is strictly positive. Determine f so that for
each a > 0 the circle t → (a cos t, a sin t) is a geodesic for the conformally
equivalent metric f 2 g . 1 ...
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 Spring '09
 Robinson

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