Undergraduate Course: Introduction to Differential Topology (MATH11122)
Course Outline
School  School of Mathematics 
College  College of Science and Engineering 
Credit level (Normal year taken)  SCQF Level 11 (Year 4 Undergraduate) 
Availability  Available to all students 
SCQF Credits  10 
ECTS Credits  5 
Summary  Smooth manifolds are a universally occurring type of metric space, looking locally like familiar ndimensional euclidean spaces, but differing from them `in the large'. For n=1, the first example beyond the real line is the circle, and for n=2 (surfaces) we have a family of topologically different possibilities, such as the (surface of the) sphere, the torus, pretzels and so on.
Manifolds provide the natural setting for a general study of differentiable (smooth) functions and mappings and differential topology looks at their basic properties. It provides some basic tools with which to study manifolds and, as is the case with the best mathematics, gives proofs of results about familiar objects that are not easy to obtain by elementary means. For example, we shall give a proof of the fundamental theorem of algebra from this point of view, as well as the famous Brouwer fixedpoint theorem, which asserts that any continuous map from the closed ball to itself must have a fixed point. We shall also define and study the Euler characteristic for compact orientable manifolds; this distinguishes the different types of surface mentioned above.
This course is part of our geometry/topology sequence. However, its methods also underlie part of the basic theory of nonlinear partial differential equations, which appears, roughly speaking, as an infinitedimensional extension of these ideas. It is therefore also of
relevance to students with an interest in these matters as well.
Aims :
1. To define smooth manifolds as certain subspaces of euclidean spaces
2. To define smooth maps between manifolds and give the implicit function theorem
3. To study regular and singular values of smooth maps
4. To define the degree of a smooth map and give standard topological applications
5. To define and study the Euler characteristic (or number) of a compact orientable manifold, including the classification of compact oriented surfaces. 
Course description 
Smooth manifolds and maps, implicit function theorem, manifolds with boundary, regular values and critical values, Sard's theorem, degree of maps, Euler number, vector fields and the Hopf index theorem.
Essentially, chapters 16 of Milnor's book, see Reading List below.

Information for Visiting Students
Prerequisites  None 
Course Delivery Information
Not being delivered 
Learning Outcomes
1. Gain experience of smooth manifolds, smooth maps and their basic properties
2. Gain experience of topological methods and results in the context of smooth manifolds

Reading List
We shall follow Milnor's book closely, referring perhaps to the others for further applications.
1. Milnor, Topology from the differentiable viewpoint, QA613.6 Mil.
2. Hirsch, Differential Topology, QA613.6 Hir
3. Guillemin and Pollack, Differential topology, QA613.6 Gui 
Additional Information
Graduate Attributes and Skills 
Not entered 
Keywords  DiT 
Contacts
Course organiser  Dr Tom Mackay
Tel: (0131 6)50 5058
Email: T.Mackay@ed.ac.uk 
Course secretary  Mrs Alison Fairgrieve
Tel: (0131 6)50 5045
Email: Alison.Fairgrieve@ed.ac.uk 

