MATH 360 Spring 2023
Combinatorics and Graph Theory
Archived Class
Charles Cusack
Mathematics and Statistics
Hope College
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Schedule for weeks 1 through 16

Wk Day Date TopicResourcesEvents

1TueJan 10
  • Course Introduction
  • Graphs
  • Graph Terminology
  • CGT 1-1.1.2
  • 1.1.1: 3,4
  • 1.1.2: 1,2,4,5,9, 12,15,16

  • ThuJan 12
  • Special Types of Graphs
  • CGT 1.1.3
  • 1.1.3: 1,5,6,8,9,10

  • 2TueJan 17
  • Distance in Graphs
  • CGT 1.2
  • 1.2.1: 1,2,6,8,11
  • 1.2.2: 1,2,4,6
  • 1.2.3: 2,3

  • ThuJan 19
  • Trees
  • CGT 1.3-1.3.3
  • HW 1 due
  • 1.3.1: 1,2,3
  • 1.3.2: 1,3,5,8
  • 1.3.3: 1,4,5,7

  • 3TueJan 24
  • Counting Trees
  • CGT 1.3.4
  • 1.3.4: 2,3,4,5,6

  • ThuJan 26
  • Trails, Circuits, Paths, and Cycles
  • CGT 1.4-1.4.2
  • HW 2 due
  • 1.4.1: 2,3
  • 1.4.2: 1,2,4,5,7,8

  • 4TueJan 31
  • Hamiltonian Paths and Cycles
  • Three Open Problems
  • CGT 1.4.3-1.4.4
  • HW 3 due
  • 1.4.3: 1,4,6,7,9,12
  • 1.4.4: 1,2,3,4

  • ThuFeb 02
  • Planarity
  • Euler's Formula and Beyond
  • CGT 1.5-1.5.2
  • 1.5.1: 1,2,5,6,8
  • 1.5.2: 1,2,4,7,9,10
  • Note: add "with triangular regions" to 10.
  • (typo)

  • 5TueFeb 07
  • Regular Polyhedra
  • Kuratowski's Theorem
  • CGT 1.5.3-1.5.4
  • HW 4 due
  • 1.5.3: 1,2
  • 1.5.4: 1,2,4

  • ThuFeb 09
  • Colorings
  • CGT 1.6-1.6.2
  • 1.6.1: 1,2,4,5
  • 1.6.2: 2,5,6,7

  • 6TueFeb 14
  • No Class
  • Winter Recess

  • ThuFeb 16
  • The Four Color Problem
  • Chromatic Polynomials
  • CGT 1.6.3-1.6.4
  • 1.6.3: 1,3,5
  • 1.6.4: 1,3,4

  • 7TueFeb 21
  • Matchings
  • Hall's Theorem and SDRs
  • CGT 1.7-1.7.2
  • HW 5 due
  • 1.7.1: 1,2
  • 1.7.2: 1,2,3,4*,6
  • *4 has typo. Need n≥2 and |Si|=n-1

  • ThuFeb 23
  • Nothing
  • Icepocalypse 2023: No class

  • 8TueFeb 28
  • The König-Egerváry Theorem
  • Perfect Matchings
  • CGT 1.7.3-1.7.4
  • 1.7.3: 1,2,3(hard?)
  • 1.7.4: 1,2,4,5,6,7

  • ThuMar 02
  • Midterm Exam

  • 9TueMar 07
  • Ramsey Theory
  • CGT 1.8
  • 1.8.1: 1,3,4
  • 1.8.2: 1,2,4,5
  • 1.8.3: 2,3,4

  • ThuMar 09
  • Combinatorics:
  • Some Essential Problems
  • CGT 2-2.1
  • HW 6 due
  • 2.1: 1,4,11,12,14

  • 10TueMar 14
  • Binomial Coefficients
  • CGT 2.2
  • 2.2: 1,2,4,6,7bd,8

  • ThuMar 16
  • Multinomial Coefficients
  • CGT 2.3
  • HW 7 due
  • 2.3: 1,2,3,4,9ace,11
  • Typo in 4: sum indices are missing "=n"

  • Spring Break Week

    11TueMar 28
  • The Pigeonhole Principle
  • CGT 2.4
  • HW 8 due
  • 2.4: 1,3,4,5,7,9,13

  • ThuMar 30
  • The Principle of Inclusion and Exclusion
  • CGT 2.5
  • 2.5: 2,4,6,8,12
  • Error in 4: change 250 to 230

  • 12TueApr 04
  • Generating Functions
  • CGT 2.6-2.6.2
  • HW 9 due
  • 2.6: 1,2
  • 2.6.1: 1,2,4
  • 2.6.2: 1,3,5,8

  • ThuApr 06
  • Changing Money
  • Fibonacci Numbers
  • CGT 2.6.3-2.6.4
  • 2.6.3: 1,3,9,10
  • 2.6.4: 1,2,5bd,10

  • 13TueApr 11
  • Recurrence Relations
  • Catalan Numbers
  • CGT 2.6.5-2.6.6
  • 2.6.5:1,2ad,6,7
  • 2.6.6: 2,3,4

  • ThuApr 13
  • Counting ways to trianglalize n-gons

  • 14TueApr 18Pólya's Theory of Counting
  • Permutation Groups
  • Burnside Lemma
  • CGT 2.7-2.7.2
  • HW 10 due
  • 2.7.1: 1,2,4,5,9
  • 2.7.2: 1,2,4

  • ThuApr 20
  • Partitions
  • CGT 2.8-2.8.1
  • 2.8.1: 1,2,3,5,10

  • 15TueApr 25
  • Stable Marriage
  • CGT 2.9-2.9.1
  • HW 11 due
  • 2.9: 1,4
  • 2.9.1: 1,3,4,8,7

  • ThuApr 27
  • Combinatorial Geometry
  • CGT 2.10-2.10.1
  • HW 12 due
  • 2.10.1: 1,2,6,9

  • ExFriMay 05
  • Final Exam
    12:30-2:20pm