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2020/21 Undergraduate Module Catalogue

MATH3143 Combinatorics

15 creditsClass Size: 195

Module manager: Dr Rudolf Tange

Taught: Semester 2 (Jan to Jun) View Timetable

Year running 2020/21

Pre-requisite qualifications

Familiarity with abstract, mathematical proof writing.

This module is approved as a discovery module

Module summary

Combinatorics is concerned with counting (and giving bounds for the number of, and proving existence of) arrangements, patterns, designs, assignments, schedules, and configurations of objects. Its applications are widespread: computer scientists, bankers, statisticians, works supervisors, industrial engineers being amongst its users.


Many problems in the real world take the form 'How many?' or 'Do there exist?'. Not all such problems have easy solutions.
This module introduces techniques for dealing with some of the more difficult problems of this kind.

On completion of this module, students should be able to decide which of the several counting techniques introduced in the course (e.g. the inclusion-exclusion principle, Ferrers diagrams, generating functions, etc.), is best suited to solving any one of a large class of counting problems, and should be able to apply that technique to solve the problem.
Examples of problems include:
(i) How many ways are there to distribute 10 distinct books among 6 identical boxes?
(ii) If you and I each have a pack of 52 cards, what are the chances, if we simultaneously turn over one card at a time, that at least one pair matches exactly?
(iii) Show that at a party of 6 people there must be either 3 people who have all met one another before, or 3 people who are mutual strangers.


Topics covered include:
1. Ordered and unordered selections, occupancy problems.
2. Partitions of sets, Bell numbers, and Stirling numbers.
3. The Inclusion-Exclusion principle and applications.
4. Partitions of numbers.
5. Generating functions. Euler's generating function for partition numbers.
6. Systems of distinct representatives and Hall's Theorem.
7. Latin squares.
8. Extremal Set Theory: intersecting families and Sperner families.

Further topics will be drawn from:
9. The pigeonhole principle & Ramsey numbers.
10. Steiner triple systems.

Teaching methods

Due to COVID-19, teaching and assessment activities are being kept under review - see module enrolment pages for information

Delivery typeNumberLength hoursStudent hours
Private study hours133.00
Total Contact hours17.00
Total hours (100hr per 10 credits)150.00

Private study

Studying and revising of course material.
Completing of assignments and assessments.

Opportunities for Formative Feedback

Regular problem solving assignments

Methods of assessment

Due to COVID-19, teaching and assessment activities are being kept under review - see module enrolment pages for information

Exam typeExam duration% of formal assessment
Open Book exam2 hr 30 mins100.00
Total percentage (Assessment Exams)100.00

Normally resits will be assessed by the same methodology as the first attempt, unless otherwise stated

Reading list

The reading list is available from the Library website

Last updated: 10/08/2020 08:42:07


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