A Course in Differential Geometry (Graduate Studies in by Thierry Aubin

By Thierry Aubin

This textbook for second-year graduate scholars is meant as an advent to differential geometry with critical emphasis on Riemannian geometry. bankruptcy I explains easy definitions and offers the proofs of the \$64000 theorems of Whitney and Sard.

Chapter II offers with vector fields and differential kinds. bankruptcy III addresses integration of vector fields and \$p\$-plane fields. bankruptcy IV develops the proposal of connection on a Riemannian manifold regarded as a method to outline parallel delivery at the manifold. the writer additionally discusses similar notions of torsion and curvature, and offers a operating wisdom of the covariant by-product.

Chapter V specializes on Riemannian manifolds by means of deducing international homes from neighborhood homes of curvature, the ultimate objective being to figure out the manifold thoroughly. bankruptcy VI explores a few difficulties in PDEs advised by means of the geometry of manifolds.

The writer is famous for his major contributions to the sphere of geometry and PDEs--particularly for his paintings at the Yamabe problem--and for his expository debts at the topic.

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Additional resources for A Course in Differential Geometry (Graduate Studies in Mathematics)

Example text

Definition. A differentiable manifold E is a vector fiber bundle of fiber the vector space F if there exist a differentiable manifold M (called the basis) and a differentiable map II of E an M such that, for all P E M, II'1(P) = Ep is isomorphic to F and there exist a neighbourhood U of P in M and a diffeomorphism p of U x F onto R-I(U) whose restriction to each Ep is linear, p satisfying 11 o p(P, z) = P for all z E F. 12. Proposition. The tangent bundle T(M) is a vector bundle of fiber IIn. M is the basis.

T -p y(t) E Mn, the point whose coordinates are {tX{} (we suppose that p(P) = 0 E ft"). Then (8(f 0'Y)1 at J t_o _ c 8(f o V-') 8(tXi) _ X(f}. r 8x 8t So 'P is onto. Moreover, if yl is not equivalent to y2i then [d(+p o y1)] t=6 # [d(+p o y2)]t=o, and it is possible to exhibit a function f such that [d(f o -tl)]t= * [d(f o -2)]t=0. 5. Definition. The tangent bundle T(M) is UpEM Tp(M). If 7 (M) denotes the dual space of Tp(M), the cotangent bundle T*(M) is UpEM Tp(M). If r > 1, we will show that T(M) carries a structure of differentiable manifold of class C".

9. Example. The tangent vector -2 to a differentiable curve -y(t) of M,, (y is a differentiable map of (a, b) C R into Mn). Let to E (a, b). , (1) being the unit vector on R. 10. Proposition. The tangent bundle T(M) has a structure of differentiable manifold of class C''-1, if Mn is a differentiable manifold of class C'' with r> 1. Let (U, p) be a local chart on Mn and P E U. If {zt} are the coordinates of Q E U and {e } the coordinates of p(Q) E Rn, then z' _ i' for 1 < i < n. This is the equality of two real numbers.