Combinatorics
Week 12 | Week 13 | Week 14
Tuesday, April 19

- Cyclotomic polynomials and Möbius inversion
Class notes
Thursday, April 21

- Graph colorings: Planarity, graph minors, the 6 and 5-color theorems for planar graphs
For graph colorings, the corresponding video lectures from last year are April 8, April 13, and April 15.
Suggested reading