Download e-book for kindle: Differential Geometry From a Singularity Theory Viewpoint by Shyuichi Izumiya, Maria Del Carmen Romero Fuster, Maria

By Shyuichi Izumiya, Maria Del Carmen Romero Fuster, Maria Aparecida Soares Ruas

ISBN-10: 9814590444

ISBN-13: 9789814590440

Differential Geometry from a Singularity concept standpoint presents a brand new examine the attention-grabbing and classical topic of the differential geometry of surfaces in Euclidean areas. The booklet makes use of singularity concept to catch a few key geometric positive factors of surfaces. It describes the idea of touch and its hyperlink with the idea of caustics and wavefronts. It then makes use of the strong concepts of those theories to infer geometric information regarding surfaces embedded in three, four and 5-dimensional Euclidean areas. The publication additionally contains contemporary paintings of the authors and their collaborators at the geometry of sub-manifolds in Minkowski areas.

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Additional resources for Differential Geometry From a Singularity Theory Viewpoint

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If two principal curvatures κi and κj coincide at p, then the components of the evolute εi (M ) and εj (M ) have a non-empty intersection. Also, the maps εi and εj are no longer differentiable at p. 1) εi : U → Rn+1 of the n components of the evolute, with εi (u) = x(u) + 1 N (u), κi (u) where we assume κi (u) = 0 for all u ∈ U and i = 1, . . , n. 1. Let M be a hypersurface in Rn+1 with nowhere vanishing principal curvatures. Then the following are equivalent. (i) M is contained in a hypersphere.

5. Let x : U → Rn+r be a parametrisation of a submanifold M in Rn+r of codimension r, and let {ν1 (u), . . , νr (u)} be an orthonormal frame of M , with ν1 (u) = ν(u). Then, n r (hji )ν xuj + (Gν )ui = − j=1 νk , νui νk k=2 with (hji )ν = (hνik )(g kj ), where all the functions are evaluated at u. As a consequence, we have the following Weingarten formula along ν n (hji )ν xuj . (π T ◦ Gν )ui = − j=1 page 38 October 12, 2015 10:9 9108 - Differential Geometry from a Singularity Theory Viewpoint 9789814590440 Submanifolds of the Euclidean space 39 Proof.

Here too we have the induced scalar product of Rn+r in Tp M and define the first fundamental form of M as for the hypersurfaces case. Let x : U → Rn+r be an embedding of an open subset U ⊂ Rn in Rn+r . We write, as in the case of hypersurfaces, M = x(U ) and identify M and U via the embedding x. The partial derivatives of x at u form a basis of the tangent space Tp M which we still denote by B(x). The first fundamental form of M , with respect to the basis B(x), is given by Ip (w) = wT (gij (u))w where gij (u) = xui (u), xuj (u) .

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Differential Geometry From a Singularity Theory Viewpoint by Shyuichi Izumiya, Maria Del Carmen Romero Fuster, Maria Aparecida Soares Ruas

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