# A Panoramic View of Riemannian Geometry by Marcel Berger By Marcel Berger

This publication introduces readers to the residing subject matters of Riemannian Geometry and information the most effects identified to this point. the consequences are acknowledged with out unique proofs however the major rules concerned are defined, affording the reader a sweeping panoramic view of just about the whole thing of the sector.

From the reports ''The ebook has intrinsic worth for a pupil in addition to for an skilled geometer. also, it truly is a compendium in Riemannian Geometry.'' --MATHEMATICAL REVIEWS

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Change in latitude is arc length. e. slower than arc length) except where the curve is tangent to a longitude line (due south). We conclude that total arc length must be greater than diﬀerence in latitude, except along longitude lines. If we have a longitude line, and any other path with the same end points, then the other path has the same total change in latitude between its end points, and so must have greater length. 8 on page 131. q q p α p Fig. 36. 6) for every spherical triangle {p, q, r} with side lengths a = d(q, r), b = d(r, p), c = d(p, q) and where A is the angle at the vertex p.

6 The Geometry of Surfaces Before and After Gauß 39 displace curves only under the proviso that the curves are traced entirely on our surface M , only the tangential part of a variation can be chosen freely. At a point c(t) of the considered curve pick up a unit vector n(t) tangent to the surface and at the same time normal to the curve. Note that (as for plane curves) there are two possibilities up to ±1. We parameterize c by its arc length s. n(t) c b a c'(t) n M n(t) M M is oriented and {a,b,n} is positive for the space orientation Fig.

As a ﬁrst example, consider the unit sphere S 2 ⊂ E3 . How do we compute d(p, q)? We should ﬁnd the shortest paths. e. the intersections of the sphere by planes through its center). From this the distance is easily computed: d(p, q) = arccos p, q ∈ [0, π]. N S Fig. 35. 35. e. change in latitude is arc length. e. slower than arc length) except where the curve is tangent to a longitude line (due south). We conclude that total arc length must be greater than diﬀerence in latitude, except along longitude lines.