By Marcel Berger

ISBN-10: 3642182453

ISBN-13: 9783642182457

ISBN-10: 364262121X

ISBN-13: 9783642621215

Riemannian geometry has at the present time develop into an enormous and significant topic. This new booklet of Marcel Berger units out to introduce readers to lots of the dwelling subject matters of the sector and produce them speedy to the most effects identified to this point. those effects are said with out certain proofs however the major principles concerned are defined and prompted. this permits the reader to procure a sweeping panoramic view of virtually the whole thing of the sector. despite the fact that, due to the fact that a Riemannian manifold is, even at the beginning, a sophisticated item, attractive to hugely non-natural thoughts, the 1st 3 chapters dedicate themselves to introducing a few of the strategies and instruments of Riemannian geometry within the such a lot normal and motivating approach, following particularly Gauss and Riemann.

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**Extra resources for A Panoramic View of Riemannian Geometry**

**Sample text**

Beware that dM is not what is called the induced metric on M from that of E3 . The only surfaces M for which the induced metric and the inner metric coincide are portions of a plane. This inner metric is determined by the Euclidean structures on the collection of the tangent planes Tm M when m runs through M , as we will see. 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).

Consider a simply closed plane curve and try to make it more like a circle by a systematic dynamical ﬂow. The idea is to deform by moving the curve along its normal direction at a speed proportional to the algebraic curvature. This is natural; at points where the curve has large curvature, one should reshape it more. 8. But it is very hard to prove that evolution is possible, ﬁrst for a short time and then forever. Moreover one can prove that the curve, suitably normalized, converges to a circle as expected.

The cut locus of a point p is the closure of the set of points which can be joined to p by more than one segment. For nonumbilic points p of the ellipsoid, it was claimed by Braunmühl 1878 that the cut locus of a point p, as a subset of the ellipsoid, is homeomorphic to a compact interval (see Braunmühl 1882 [257]). The two extremities are joined to p by a unique shortest path, while points in the interior of this interval are joined to p by exactly two shortest paths. There is still no complete proof of this assertion, despite von Mangoldt 40 1 Euclidean Geometry 1881 [893].

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

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