Nathan Bowler
Lecture course "Graph Minors", summer semester 2020
BigBlueButton room:
The course takes place in this BigBlueButton room. For best results, use the Chrome browser. The access code is 414010. Lectures are recorded. The following links also work best in Chrome:
Lecture 1
Lecture 2
Lecture 3
Lecture 4
Lecture 5
Lecture 6
Lecture 7
Lecture 8
Lecture 9
Lecture 10
Lecture 11
Lecture 12
Lecture 13
Lecture 14
Lecture 15
Lecture 16
Lecture 17
Lecture 18
Lecture 19
Lecture 20
Lecture 21
Exercises:
There will be one exercise sheet per week. Exercise classes will take place in the same room. Please be prepared to present your answers online. Exercise sheets will be uploaded here:
Sheet 1
Sheet 2
Sheet 3
Sheet 4
Sheet 5
Sheet 6
Sheet 7
Sheet 8
Sheet 9
Sheet 10
Sheet 11
Supporting material:
Scans of what I wrote during the lecture are here:
Chapter 1: Introduction to the structure theorem
Chapter 2: Necklaces and the grid theorem
Chapter 3: The crossing theorem and graph renditions
Chapter 4: The flat mesh theorem
Chapter 5: Societies and vorticial renditions
Chapter 6: Gluing flat regions together
Chapter 7: Filing cabinets
Overview (only pictures)
There are now also lecture notes. Many thanks to Raphael Jacobs, who TeXed them, and Florian Gut and Paul Knappe for correcting them.
As well as the graph minors papers of Robertson and Seymour, parts of the lecture will be closely based on the following papers:
A generalisation of the grid theorem by Jim Geelen and Benson Joeris
A new proof of the flat wall theorem by Paul Wollan
Videos of a lecture course by Jim Geelen on the same topic can be found here.
