**Note:** You are looking at a static copy of the former PineWiki site, used for class notes by James Aspnes from 2003 to 2012. Many mathematical formulas are broken, and there are likely to be other bugs as well. These will most likely not be fixed. You may be able to find more up-to-date versions of some of these notes at http://www.cs.yale.edu/homes/aspnes/#classes.

# 1. From RosenBook

Do Exercises 8.3.44, 8.4.12, and 8.4.20.

# 2. Not from RosenBook

Let G and H be simple undirected graphs. Prove or disprove:

If G and H are both connected, then so is their square product G ◻ H.

- If G and H are both connected, then so is their cross product G × H.