CO 330 -- Combinatorial enumeration, Fall 2026

Information

We will explore combinatorial classes by

• Meeting classical discrete objects
• Counting them
• Finding bijections between classes
• Generating random elements

Instructor: Rowan Yeats (I usually go by Ren). Pronouns he/him or they/them.
Office: MC 5126
Email: ren.yeats at uwaterloo.ca
Office Hours: Mondays 12:30-1:30 and Fridays 11-noon in MC 5126 or by appointment
Lectures: Mondays, Wednesdays, and Fridays 9:30-10:20, MC 4060
TAs: Zeus Dantas e Moura and Matteus Froese
TA office hours TBA.
Syllabus.

References:

• Combinatorial Enumeration course notes by David Wagner
• An Invitation to Enumeration by Stephen Melczer

Announcements

• Wednesday September 9 will be an optional review session of the things that you should remember from MATH 239/249 in order to thrive in this course. The course proper will begin on Friday September 11, when everyone should attend.

Assignments

Assignments will be less than weekly and due by crowdmark typically on Fridays at 3pm.

Class Summaries

These summaries are not meant to replace your own notes, but give an overview and useful references. They are summaries not full notes.

Part 0: Introduction and review

Part 1: Combinatorial classes, generating series and combinatorial constructions, Lagrange inversion, and lets sneak in some bijections too.