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# MSc Pure Mathematics and Mathematical Logic / Course details

Year of entry: 2022

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## Course unit details:Noncommutative Algebra

Unit code MATH62041 15 FHEQ level 7 – master's degree or fourth year of an integrated master's degree Semester 1 Department of Mathematics No

### Overview

Nature is inherently noncommutative---just try putting on your shoes and socks in the wrong order---and noncommutative structures are increasingly important throughout mathematics and physics. In this course, we will examine in detail some of the most important noncommutative algebras that appear "in nature" and prove some of the basic structure theorems about noncommutative rings. One of the most fundamental such algebras is the quaternions---if you ignore the fact that it is not commutative, then this is a field that is 4-dimensional as a real vector space! Famously when Hamilton discovered it in the 19-th century he carved its formulae on a bridge lest he forget them. Another is the Weyl algebra---sometimes called the "algebra of quantum mechanics" since its structure encodes the Uncertainty Principle, and sometimes called a ring of differential operators since it encodes the algebraic aspects of differential equations.

### Pre/co-requisites

Students are not permitted to take, for credit, MATH42041 in an undergraduate programme and then MATH62041 in a postgraduate programme at the University of Manchester, as the courses are identical.

### Aims

To introduce students to noncommutative algebra.

### Learning outcomes

On successful completion of this course unit students will be able to:

• demonstrate familiarity with fundamental noncommutative algebras, in particular the quaternions, matrix rings over division rings and the Weyl algebras;
• produce proofs involving the basic concepts of modules as covered in the course unit, in particular annihilators, the artinian and noetherian conditions, homomorphisms and endomorphism rings;
• produce proofs similar to parts of the proofs of the basic structure theorems in noncommutative algebra established in the course, in particular the Wedderburn density theorem, the classification of simple Artinian rings and the structure of modules over principal ideal domains;
• analyse examples using those structure theorem.

### Syllabus

• Introduction and preliminaries: fields, rings and matrices;
• Examples of noncommutative rings, the quaternions and the Weyl algebra;
• Wedderburn-Artin theory - many rings are matrices;
• The structure of Artinian rings;
• Introduction to representation theory;
• The structure of modules over principal ideal domains;
• Division rings.

### Assessment methods

Method Weight
Other 20%
Written assignment (inc essay) 80%
• Coursework: weighting 20%
• End of semester examination: weighting 80%

### Feedback methods

Feedback tutorials will provide an opportunity for students' work to be discussed and provide feedback on their understanding.  Coursework or in-class tests (where applicable) also provide an opportunity for students to receive feedback.  Students can also get feedback on their understanding directly from the lecturer, for example during the lecturer's office hour.

• Cohn, P. M. Introduction to ring theory. Springer-Verlag, 2000.
• Passman, D. S. A course in ring theory. The Wadsworth & Brooks/Cole Mathematics Series, 1991.
• Lam, T. Y. A first course in noncommutative rings. Second edition. Graduate Texts in Mathematics, 131. Springer-Verlag, New York, 2001

### Study hours

Scheduled activity hours
Lectures 33
Independent study hours
Independent study 117

### Teaching staff

Staff member Role
Mike Prest Unit coordinator