Integrating Differential Forms. and closely follow Guillemin and Pollack’s Differential Topology. 2 1Open in the subspace topology. 3. In the winter of , I decided to write up complete solutions to the starred exercises in. Differential Topology by Guillemin and Pollack. Originally published: Englewood Cliffs, N.J.: Prentice-Hall,

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I plan to cover the following topics: One then finds another neighborhood Z of f such that functions in the intersection of Y and Z are forced to be embeddings. I used Tietze’s Extension Theorem and the fact that a smooth mapping to a sphere, which is defined on the boundary of a manifolds, extends smoothly to the whole manifold if and only if the degree is zero. Towards the end, basic knowledge of Algebraic Topology definition and elementary properties of homology, cohomology and homotopy groups, weak homotopy equivalences might be helpful, but I will review the relevant constructions and facts in the lecture.

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Immidiate consequences are that 1 any two disjoint closed subsets can be separated by disjoint open subsets and 2 for any member of an open cover one can find a closed subset, such that the resulting collection of closed subsets still covers the whole manifold.

I also proved the parametric version of TT and the jet version. The course provides an introduction to differential topology. As a consequence, any vector bundle over a contractible space is trivial.

I proved that any vector bundle whose rank is strictly larger than the dimension of the manifold admits such a section. The standard notions that are taught in the first course on Differential Geometry e. A formula for the norm of the r’th differential of a composition of two functions was established in the proof.


The basic idea is to control the values of a function as well as its derivatives over a compact subset. I stated the problem of understanding which vector bundles admit nowhere vanishing sections. Then I defined the compact-open and strong topology on the set of continuous functions between topological spaces.

Differential Topology

By inspecting the proof of Whitney’s embedding Guillemkn for compact manifoldsrestults about approximating functions by immersions and embeddings were obtained. I defined the linking number and the Hopf guillemkn and described some applications.

I proved that this definition does not depend on the chosen regular value and coincides for homotopic maps. Differentkal reduces to proving that any two vector bundles which are concordant i.

An exercise section in Chapter 4 leads the student through a construction of de Rham cohomology and a proof of its homotopy invariance. In the end I defined isotopies and the vertical derivative and showed that all tubular neighborhoods of a fixed submanifold can be related by isotopies, up to restricting to a neighborhood of the zero section and the action of an automorphism of the normal bundle. The rules for passing the course: Some are routine explorations of the main material.

The proof consists of an inductive procedure and a relative version of an apprixmation result for maps between open subsets of Euclidean spaces, which is proved with the help of convolution kernels.

Pollack, Differential TopologyPrentice Hall In the years since its first publication, Guillemin and Pollack’s book has become a standard text on the subject.


The proof relies on the approximation results and an extension result for the strong topology. As an application of the jet version, Differeential deduced that the set of Morse functions on a smooth manifold forms an open and dense subset with respect to the strong topology. The pollaack is mostly self-contained, requiring only undergraduate analysis and linear algebra. I proved homotopy invariance of pull backs. I continued to discuss the degree of a map between compact, oriented manifolds of equal dimension.

Various transversality statements where proven with the help of Sard’s Theorem and the Globalization Theorem both established in the previous class. The book has a wealth of exercises of various types.

It is the topology whose basis is given by allowing for infinite intersections of memebers of the subbasis which defines the weak topology, as long as the rifferential collection of topoloy on M is locally finite. I first discussed orientability and orientations of manifolds. For AMS eBook frontlist subscriptions or backfile collection purchases: Then I revisted Whitney’s embedding Theoremand extended it to non-compact manifolds.

The proof of this relies on the fact that the identity map of the sphere is not homotopic to a constant map.

differential topology

I outlined a proof of the fact. Moreover, I showed that if the rank equals the dimension, there is always a section that vanishes at exactly one point.

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