MATH20201 - Algebraic Structures 1

Year: 2 - Semester: 1 - Credit Rating: 10


The course unit aims to introduce basic ideas group theory with a good range of examples so that the student has some familiarity with the fundamental concepts of abstract algebra and a good grounding for further study.

Brief Description

This course unit provides an introduction to groups, one of the most important algebraic structures. It gives the main definitions, some basic results and a wide range of examples. This builds on the study of topics such as properties of the integers, modular arithmetic, and permutations included in MATH10101/MATH10111. Groups are a fundamental concept in mathematics, particularly in the study of symmetry and of number theory.

Learning Outcomes

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

  • Appreciate and use the basic definitions and properties of groups;
  • Command a good understanding of the basic properties for a good range of examples;
  • Understand and find simple proofs of results in group theory.


  • Binary operations. Multiplication tables, associativity, commutativity, associative powers. [2 lectures]
  • Groups. Definitions and examples (groups of numbers, the integers modulo n, symmetric groups, groups of matrices). [2]
  • Subgroups. Subgroup criterion, cyclic subgroups, centralizer, centre, order of an element. [4]
  • Cyclic groups. Subgroups of cyclic groups are cyclic, subgroups of finite cyclic groups. [1]
  • Cosets and Lagrange's Theorem. [2]
  • Homomorphisms and isomorphisms. Definition and examples, group theoretic properties. [2]
  • Conjugacy. Conjugacy classes, conjugacy in symmetric groups, the class formula. [4]
  • Normal subgroups. [2]
  • Factor groups. [2]
  • The First Isomorphism Theorem [1]

Teaching & Learning Process (Hours Allocated To)

Lectures Tutorials/Example Classes Practical Work/Laboratory Private Study Total
33 0 0 67 100

Assessment and Feedback

  • Coursework; An in-class test, weighting within unit 20%
  • 2 hours end of semester examination; Weighting within unit 80%

Further Reading

John B. Fraleigh, A First Course in Abstract Algebra, Addidon-Wesley

Staff Involved

Prof Ralph Stohr - Lecturer

Data source is EPS system
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