By Leonor Godinho, José Natário

ISBN-10: 3319086650

ISBN-13: 9783319086651

Unlike many different texts on differential geometry, this textbook additionally deals attention-grabbing purposes to geometric mechanics and common relativity.

The first half is a concise and self-contained creation to the fundamentals of manifolds, differential kinds, metrics and curvature. the second one half reviews purposes to mechanics and relativity together with the proofs of the Hawking and Penrose singularity theorems. it may be independently used for one-semester classes in both of those subjects.

The major rules are illustrated and extra built by means of a number of examples and over three hundred workouts. specified recommendations are supplied for lots of of those routines, making *An creation to Riemannian Geometry* perfect for self-study.

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**Sample text**

Also, by construction, is maximal with respect to and . Two atlases are said to be equivalent if they define the same differentiable structure. (3)We could also have defined -manifolds by requiring the coordinate changes to be -maps (a -manifold would then denote a topological manifold). 3 (1)The space with the usual topology defined by the Euclidean metric is a Hausdorff space and has a countable basis of open sets. 1 are trivially satisfied and we have an atlas for . The maximal atlas that contains this parameterization is usually called the standard differentiable structure on .

Proof Let and be parameterizations around and . Let us assume for simplicity that and . Since is an immersion, is injective (where is the expression of in local coordinates). Hence we can assume (changing basis on if necessary) that this linear transformation is represented by the matrix where is the identity matrix. Therefore, the map has derivative given by the matrix Applying the inverse function theorem, we conclude that is a local diffeomorphism at . This implies that is also a local diffeomorphism at , and so is another parameterization of around .

E. if and only if the functions are differentiable. 11(1)]. This function is called the directional derivative of along . Thus one can view as a linear operator . Let us now take two vector fields . In general, the operators and will involve derivatives of order two, and will not correspond to vector fields. However, the commutator does define a vector field. 2 Given two differentiable vector fields on a smooth manifold , there exists a unique differentiable vector field such that for every differentiable function .

### An Introduction to Riemannian Geometry: With Applications to Mechanics and Relativity by Leonor Godinho, José Natário

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