# MATH342 Modern Algebra

Introduces the modern algebraic concepts of a group and a ring. These concepts occur throughout modern mathematics and this paper looks at their properties and some applications.

Modern algebra is studied all over the world, perhaps not surprisingly in view of its international beginnings in the late 1700s with work of the Swiss mathematician Leonhard Euler, the French mathematician Joseph Louis Lagrange, and the German mathematician Carl Friedrich Gauss. Their work led to the introduction in the 1800s of the unifying abstract algebraic concepts of a group and a ring, the first of these pioneered by Arthur Cayley, the second by Richard Dedekind. These two notions of a group (a set with a standard operation, usually called multiplication) and a ring (a set with two operations, usually called addition and multiplication) are very important in many of the sciences as well as mathematics in both its pure and applied branches. Even after more than 100 years since their introduction, most of today’s research in modern algebra involves the study of either groups or rings (or both!)

The learning aims of the paper are principally to develop the notions of groups and rings, to see how these arise in a variety of mathematical settings, and to establish their fundamental properties. We will also study practical applications of these objects to cryptography and to detecting/correcting errors that occur in transmission of data.

Paper title Modern Algebra MATH342 Mathematics 0.15 18 points Semester 1 (On campus) \$929.55 Tuition Fees for international students are elsewhere on this website.
Prerequisite
MATH 202
Schedule C
Arts and Music, Science
Eligibility

This paper will be of interest to anyone who wishes to see how algebraic properties and phenomena arising in different branches of mathematics and science can be described and understood using the concepts of groups and rings, and how these concepts can be applied to contemporary practical problems regarding private and accurate communciation of data across insecure or unreliable channels.

Students who wish to pursue their interests in algebra should take this course as a foundation to more advanced papers in the theory of groups, Galois Theory, rings, modules and algebras.

Contact

maths@otago.ac.nz

Teaching staff

Dr Dominic Searles

Paper Structure

Main topics:

• Groups; subgroups; homomorphism and isomorphism; cosets and normal subgroups; quotient groups; Lagrange’s theorem, RSA encryption
• Rings; subrings; homomorphism and isomorphism; ideals; quotient rings; integral domains; fields; polynomial rings; factorisation in rings, error-correcting codes
Teaching Arrangements

Five lectures per fortnight and one weekly tutorial.

Textbooks

Recommended texts: Abstract Algebra, third edition by David S. Dummit and Richard M. Foote; Contemporary Abstract Algebra, eighth edition by Joseph A. Gallian.

Course outline
View course outline for MATH 342
Communication, Critical thinking.
Learning Outcomes
Demonstrate the ability to use mathematical reasoning by writing proofs in the context of groups and rings.

## Timetable

### Semester 1

Location
Dunedin
Teaching method
This paper is taught On Campus
Learning management system
Other

#### Lecture

Stream Days Times Weeks
Attend
A1 Monday 10:00-10:50 9-15, 18-22
Wednesday 11:00-11:50 9-15, 17-22
Friday 11:00-11:50 9, 11, 14, 17, 19, 21

#### Tutorial

Stream Days Times Weeks
Attend
A1 Thursday 09:00-09:50 9-15, 17-22