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MST30010

Academic Year 2026/2027

Group Theory and Applications (MST30010)

Subject:
Mathematical Studies
College:
Science
School:
Mathematics & Statistics
Level:
3 (Degree)
Credits:
5
Module Coordinator:
Professor Gary McGuire
Trimester:
Autumn
Mode of Delivery:
On Campus
Internship Module:
No
How will I be graded?
Letter grades

Curricular information is subject to change.

This is an intermediate level group theory module, with some emphasis on applications. There will also be some ring theory and some field theory.

Revision of MST20010, Groups, examples of groups, subgroups, group homomorphisms, kernel, quotient groups. Revision of integers and integers modulo n. Group-theoretic proof of Euler-Fermat theorem and Chinese Remainder Theorem. Group structure of multiplicative groups modulo n, quadratic residues. Rings, polynomial rings, matrix rings, ideals. Group of invertible matrices. Discrete logarithm problem and data security

About this Module

Learning Outcomes:

Upon successful completion of this module a student should have the following skills:

1. Solid understanding of the main concepts and results indicated within the contents of this module.
2. The ability to apply Lagrange's theorem and group actions to deduce statements on the structure of groups.
3. The ability to compare groups and rings (via homomorphisms between them).
4. The ability to use basic algebraic tools in the context of matrix rings, polynomials rings, and the group of invertible matrices.
5. The ability to build combinatorial and arithmetic arguments relying on fundamentals of group theory.

Indicative Module Content:

Basics of groups, subgroups, cyclic groups, cosets, Lagrange's theorem, normal subgroups and quotient groups, the centre of a group, homomorphisms, the isomorphism theorems, the subgroup correspondence theorem, group actions, orbits, conjugacy. Rings, ideals, maximal ideals, quotient rings, matrix rings, polynomial rings.

The United Nations identified seventeen Sustainable Development Goals (SDGs) as core to the 2030 Agenda for Sustainable Development, and UCD contributes in general to SDG 4 Quality Education. Further SDGs explored within this module if relevant are listed below. A scale of 1 - 5 indicates the extent to which the SDG is covered.


 

Student Effort Hours:
Student Effort Type Hours
Lectures

18

Tutorial

6

Specified Learning Activities

32

Autonomous Student Learning

50

Total

106


Approaches to Teaching and Learning:
Active/Task-based Learning
Lectures
Enquiry & Problem-based Learning

Requirements, Exclusions and Recommendations
Learning Requirements:

Students should have completed a course in abstract algebra prior to taking this module (for example, MST20010). This course should contain at least an introduction to groups, subgroups, cosets, and permutation groups.

All questions about eligibility (in particular if you think the meet the requirements but have not passed MST20010) should be addressed to the module coordinator.


Module Requisites and Incompatibles
Co-requisite:
MST20010 - Algebraic Structures


 

Assessment Strategy
Description Timing Component Scale Must Pass Component % of Final Grade In Module Component Repeat Offered
Exam (In-person): Midterm Exam Week 6, Week 7, Week 8 Alternative linear conversion grade scale 40% No
30
No
Exam (In-person): Final Exam End of trimester
Duration:
2 hr(s)
Alternative linear conversion grade scale 40% No
70
No

Carry forward of passed components
No
 

Resit In Terminal Exam
Spring Yes - 2 Hour
Please see Student Jargon Buster for more information about remediation types and timing. 

Feedback Strategy/Strategies

• Feedback individually to students, post-assessment
• Group/class feedback, post-assessment
• Self-assessment activities

How will my Feedback be Delivered?

Feedback will be given during classtime as students work collaboratively on group assignments. Optional quizzes may be given online through Brightspace with feedback.

Title: A Concrete Introduction to Higher Algebra (3rd edition)
Author: Lindsay N. Childs