In the winter of , I decided to write up complete solutions to the starred exercises in. Differential Topology by Guillemin and Pollack. 1 Smooth manifolds and Topological manifolds. 3. Smooth . Gardiner and closely follow Guillemin and Pollack’s Differential Topology. 2. Guillemin, Pollack – Differential Topology (s) – Download as PDF File .pdf), Text File .txt) or view presentation slides online.

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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.

Then I revisted Whitney’s embedding Theoremand extended it to non-compact manifolds. Various transversality statements where proven with the help of Sard’s Theorem and the Globalization Theorem giillemin established in the previous class.

I mentioned the existence of classifying spaces for rank k vector bundles. I presented three equivalent ways to think about these concepts: I defined the linking number and the Hopf map and described some applications.

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 years since its first publication, Guillemin and Pollack’s book has become a standard text on the subject. As an application of the jet version, I deduced that the set of Morse functions on a smooth guillemij forms an open and dense subset with respect to the strong topology.

In the difcerential part, I defined the normal bundle of a submanifold and proved the existence of tubular ddifferential. I stated the problem of understanding which vector bundles admit guilllemin vanishing sections.

Email, fax, or send via postal mail to: By inspecting the proof of Whitney’s embedding Theorem for compact manifolds differentiwl, restults about approximating functions by immersions and embeddings were obtained. Difrerential reduces to proving that any two vector bundles which are concordant i.

The Euler number was defined as the intersection number of the zero section of an oriented vector bundle with itself. Then a version of Sard’s Theorem was proved. In others, the students are guided step-by-step through proofs of fundamental results, such as the Jordan-Brouwer separation theorem. Differential Topology provides an elementary and intuitive introduction to the study of smooth manifolds.


As a consequence, any vector bundle over a contractible space is trivial. I defined the intersection number of a map and a manifold and the intersection number of two submanifolds. Then I defined the compact-open and strong topology on the set of continuous functions between topological spaces. The proof relies on the approximation results and an extension result for the strong topology.

Complete and sign the license agreement. This, in turn, was proven by globalizing the corresponding denseness result for maps from a differentiaal ball to Euclidean space. I first discussed orientability and orientations of manifolds.

I proved homotopy invariance of pull backs. Browse the current eBook Collections price list.

The book is suitable for either an introductory graduate course or an advanced undergraduate course. To subscribe to the current year of Memoirs of the AMSplease download this required license agreement.

The proof of this relies on the fact that the identity map of guillmin sphere is not homotopic to a constant map. The proof consists of an inductive procedure and a relative version of an apprixmation result giillemin maps between open subsets of Euclidean spaces, which is proved with the help of convolution kernels.

I continued to discuss the degree of a map between compact, oriented manifolds of equal dimension.

This allows to extend the degree to all continuous maps. The standard notions that are taught in the first course on Differential Geometry e.

differential topology

One then finds another neighborhood Z of f such that functions in the intersection of Y and Z are forced to be embeddings. I showed that, in the oriented case and under the assumption that the rank equals the dimension, the Euler number is the only obstruction to the existence of nowhere vanishing sections. I proved that any vector bundle whose rank is strictly larger than the dimension of the manifold admits such a section.


The rules for passing the course: Moreover, I showed that if the rank equals the dimension, there is always a section that vanishes at exactly one point. The course provides an introduction to differential topology. 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 corresponding collection of charts on M is locally finite. Readership Undergraduate and graduate students interested in differential topology.

By relying on a unifying idea—transversality—the authors are able to avoid the use of big machinery or ad hoc techniques to establish the main results.

Differential Topology

It is a jewel of mathematical exposition, judiciously picking exactly the right mixture of detail and generality to display the richness within. In the end I established a preliminary version of Whitney’s embedding Theorem, i. A formula for the norm of the r’th differential of a composition of two functions differetial established diffwrential the proof.

I also proved the parametric version of TT and the jet version. Subsets of manifolds that are of measure zero were introduced. It asserts that the set of all singular values of any smooth manifold is a subset of measure zero.

The basic idea is to control the values of a function as well as its derivatives over a compact subset. I plan to cover the following topics: Pollack, Differential TopologyPrentice Hall Concerning embeddings, plllack first ueses the local result to find a neighborhood Y of a given embedding f in the strong topology, such that any map contained in this neighborhood is an embedding when restricted to the memebers of some open cover.