Math 218

Combinatorics

General Information Schedule Homework

Schedule

We will cover most of the material from Chapters 1-13 of the book, along with a few additional topics if time permits. The following is a sketch of the topics we covered on each day.

Class Number Date Sections in Text Brief Description
1 Friday, 8/26 - Introduction, Examples of Combinatorial Problems
2 Monday, 8/29 2.1 Divisibility, Induction
3 Wednesday, 8/31 2.1 Induction, Division with Remainder
4 Friday, 9/2 2.2 Strong Induction, Primes, Greatest Common Divisors
5 Monday, 9/5 - Greatest Common Divisors, The Euclidean Algorithm
6 Wednesday, 9/7 - The Fundamental Theorem of Arithmetic
7 Friday, 9/9 1.1 The Pigeonhole Principle, Injections, Surjections
8 Monday, 9/12 1.1, 1.2 Applications of the Pigeonhole Principle
9 Wednesday, 9/14 1.2 More Pigeonhole Applications
- Friday, 9/16 - Class Canceled
10 Monday, 9/19 3.1, 3.2, 3.3 Elementary Counting Problems, Permutations, Combinations
11 Wednesday, 9/21 3.1, 3.2, 3.3 Counting Problems
12 Friday, 9/23 4.1 Binomial Theorem, Properties of Binomial Coefficients
13 Monday, 9/26 - First Exam
14 Wednesday, 9/28 4.1 Binomial Coefficient Identities
15 Friday, 9/30 4.1, 4.2, 5.1 Sums of Binomial Coefficients, Multinomial Theorem, Compositions
16 Monday, 10/3 5.1, 5.2 Compositions and Set Partitions
17 Wednesday, 10/5 5.2, 5.3 Stirling Numbers of the Second Kind, Integer Partitions
18 Friday, 10/7 5.3, 6.1 Integer Partitions, Permutations
19 Monday, 10/10 6.1 Permutations, Stirling Numbers of the First Kind
20 Wednesday, 10/12 6.1 Stirling Numbers of the First Kind, Inversions in Permutations
21 Friday, 10/14 7.1, 7.2 The Sieve Formula (Inclusion-Exclusion), Surjections, Derangements
- Monday, 10/17 - Fall Break
- Wednesday, 10/19 - Fall Break
- Friday, 10/21 - Fall Break
22 Monday, 10/24 7.1, 7.2 Counting Primes, Euler Phi-Function
23 Wednesday, 10/26 - Equivalence Relations
24 Friday, 10/28 9.1 Equivalence Relations, Fundamental Definitions of Graph Theory
25 Monday, 10/31 9.1, 9.2 Cycles, Eulerian Trails
26 Wednesday, 11/2 - Second Exam
27 Friday, 11/4 9.1, 9.2 Eulerian Trails, Hamiltonian Cycles
28 Monday, 11/7 10.1 Trees
29 Wednesday, 11/9 10.1 Equivalent Characterizations of Trees, Cayley's Formula
30 Friday, 11/11 10.1, 10.2 Cayley's Formula, Kruskal's Algorithm
31 Monday, 11/14 11.1, 11.2 Vertex Coloring, Bipartite Graphs
32 Wednesday, 11/16 11.3 Matchings in Bipartite Graphs
33 Friday, 11/18 11.3 Augmenting Paths, Stable Marriages
34 Monday, 11/21 12.1 Planar Graphs
35 Wednesday, 11/23 12.2 Planar Graphs, Convex Regular Polehydra
- Friday, 11/25 - Thanksgiving Break
36 Monday, 11/28 12.3, 13.1 Coloring Planar Graphs, Coloring Maps, Ramsey Theory
37 Wednesday, 11/30 - Third Exam
38 Friday, 12/2 13.1 Ramsey Theory
39 Monday, 12/5 15.2 Probabilistic Method, Lower Bounds on Ramsey Numbers
40 Wednesday, 12/7 8.1 Generating Functions
41 Friday, 12/9 8.1 Generating Functions and Recurrence Relations