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

Differential Topology

I plan to cover the following topics: The existence of such a section is equivalent to splitting the vector bundle into a trivial line bundle and a vector bundle of lower rank. Email, fax, or send via postal mail to: 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. I defined the intersection number of a map and a manifold and the intersection number of two submanifolds.

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

differential topology

differengial 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 ppllack defined embeddings and transversality between a map and a submanifold. As a consequence, any vector bundle over a contractible space is trivial. To subscribe to the current year of Memoirs of the AMSplease download this required license agreement.

Differential Topology provides an elementary and intuitive introduction to the study of smooth manifolds. Diffsrential asserts that the set of all singular values of any smooth manifold is a subset of measure zero. The course provides an introduction to differential topology. I defined the linking number and the Hopf map and described some applications. It is a jewel of mathematical exposition, judiciously picking exactly the right mixture of detail and generality to display the richness within.


This reduces to proving that any two vector bundles which are concordant i. Pollack, Differential TopologyPrentice Hall 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 guillemn locally finite. Email, fax, or send via postal mail polllack.

The standard notions that are taught in the first course on Differential Geometry e. 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.

Concerning embeddings, one 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.

I proved that this definition does not depend on the chosen regular value and coincides for homotopic maps. The proof relies on the approximation results and an extension result for the strong topology. Browse differentiial current eBook Collections price list. The proof of this relies on the fact that the identity map of the sphere is not homotopic to a constant map.

Differential Topology – Victor Guillemin, Alan Pollack – Google Books

The rules for passing the course: I outlined a proof of the fact. 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.


Subsets of manifolds that are of measure zero were introduced. The book has a wealth of exercises of various types. Then a version of Sard’s Theorem was proved. A formula for the norm of the r’th differential of a composition of two functions was established in the proof.

Various transversality statements where proven with the help of Sard’s Theorem and the Globalization Theorem both established in the previous class. In the end I established a preliminary version of Whitney’s embedding Theorem, i. The book is suitable for either an introductory graduate course or an advanced undergraduate course. Immidiate consequences are that 1 any two disjoint closed subsets can be separated by disjoint open subsets and 2 for any member tuillemin an open cover one can find a closed subset, such that the resulting collection of closed subsets still covers the whole manifold.

This, in turn, was proven by globalizing the corresponding denseness result for maps from a closed ball to Euclidean space. Some are routine explorations of the main material. I stated differrntial problem of understanding which vector bundles admit nowhere vanishing sections. The basic idea is to control the values of a function as well as its derivatives over a compact subset. There is a midterm examination and a final examination. This allows differrential extend the degree to all continuous maps.

In the second part, I defined the normal bundle of a submanifold and proved the existence of tubular neighborhoods. Dkfferential proved homotopy invariance of pull backs. I proved that any vector bundle whose rank is strictly larger than guollemin dimension of the manifold admits such a section.