Homework: Reading and Problem Sets

Math 280, Fall 2026
Rob Benedetto


All section numbers are from Harris, Hirst, and Mossinghoff, Combinatorics and Graph Theory, 2nd edition.

Videos may be found on the Math-280 moodle site.

This table will grow as the semester progresses and more problem sets are assigned.

All sets due on Gradescope at 11:59pm ET on their due dates.

(Think of that as 11:49pm, allowing at least 10 minutes to submit on Gradescope and assign pages to problems.)

Click here for more homework rules.

Reading, Videos, and Problem Sets
Set
Number
Due Sections
to Read
Videos
to Watch
Problem
Sheet
Solutions
0 Thu,
Sep 3
-- -- Homework 0 N/A
1 Mon,
Sep 7
1.1.1,
1.1.2
Video 1: Sets and
     Motivating Examples
Optional Video 2: Variants
     on Graphs
Video 3: Neighborhoods
     of Sets
Video 4: Subgraphs, etc.
Video 5: Deleting
     Vertices or Edges
Homework 1 Solutions to Homework 1
2 Fri,
Sep 11
1.1.3 Video 6: Examples
     of Graphs
Video 7: Two
     Sample Proofs
Video 8: Graph
     Isomorphisms
Optional Video 9: Distance
     on a Graph
Optional Video 10: Two
     Little Theorems
Homework 2 Solutions to Homework 2
3 Wed,
Sep 16
1.1.2,
1.2.2
Video 11: Proving an
     Adjacency Corollary
Optional Video 12: Other
     Matrices Associated
     with a Graph
Homework 3 Solutions to Homework 3
4 Wed,
Sep 23
1.3.1,
1.3.2
Video 13: Some Miscellaneous
     Tree Results
Homework 4



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