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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In the end I diifferential a preliminary version of Whitney’s embedding Theorem, i. In the second part, I defined the normal bundle of a submanifold and proved the existence of tubular neighborhoods. Then basic notions concerning manifolds were reviewed, such as: 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 corresponding collection of charts on M is locally finite. One then finds another neighborhood Z of f such that functions in the intersection of Y and Z are forced to be embeddings. I outlined a proof of the fact. The course provides an introduction to differential topology.

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

This, in turn, was proven by globalizing the corresponding denseness result for maps from a closed ball to Euclidean space. I proved homotopy invariance of pull backs. The projected date for the final examination is Wednesday, January23rd.

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 plan to cover the following topics: The proof of this relies on the fact that the identity map of the sphere is not homotopic to a constant map. 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.


In others, the students are guided step-by-step through proofs of fundamental results, such as the Jordan-Brouwer separation theorem.

I first discussed orientability and orientations of manifolds. Email, fax, or send via postal mail to:. I defined the linking number and the Hopf map and described some applications.

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The rules for passing the course: Email, fax, or send topklogy postal mail to: I mentioned the existence of classifying spaces for rank k vector bundles. As an application of the jet version, I deduced that the set of Morse functions on a smooth manifold forms an open and dense subset with respect to the ddifferential topology.

To subscribe to the current year of Memoirs of the Giulleminplease download this required license agreement. The main aim was to show that homotopy classes of maps from a compact, connected, oriented manifold to the sphere of the same dimension are classified by the degree.

Then I revisted Whitney’s embedding Theoremand extended it to non-compact manifolds. 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.

By inspecting the proof of Whitney’s embedding Theorem for compact manifoldsrestults about approximating functions by immersions and embeddings were obtained. It asserts that the set of all singular values of any smooth manifold is a subset of measure zero. 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. I continued to discuss the degree of a map between compact, oriented manifolds of equal dimension.

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The basic idea is to control the values of a function as well as its derivatives over a compact subset. This allows to extend the degree to all continuous maps.

Differential Topology

At the beginning I gave a short motivation for differential topology. I introduced submersions, immersions, stated the normal form theorem for functions of locally constant rank and defined embeddings and transversality between a map and a submanifold. Differential Topology provides an elementary and intuitive introduction to the study of smooth manifolds.

This 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.

Readership Undergraduate and graduate students interested in differential topology. It is a jewel of mathematical exposition, judiciously picking exactly the right mixture of detail and generality to display the richness within. Some are routine explorations of the main material. The text is mostly self-contained, requiring only undergraduate analysis and linear algebra.