As significant mathematics errors appear, they will be logged here. Most of the typographical errors (missing/extraneous spaces, mathematics in non-math font, etc.) are not listed.

**Section 1.5, Exercise 8**should read "For any positive integer \(k\), let \(A_k = \dots\)" (found by Matthew Haner)- The definition of
subgraph in Section 9.1 needs clarification. Here is an interim definition**Definition: Subgraph**Let \(G=(V,E)\) be a graph of any kind: directed, directed multigraph, or undirected. \(G'=(V',E')\) is a

**subgraph**of \(G\) if \(V' \subseteq V\) and \(e \in E'\) only if \(e \in E\) and the vertices of \(e\) are in \(V'\). You create a subgraph of \(G\) by removing zero or more vertices and all edges that include the removed vertices and then you possibly remove some other edges.If the only removed edges are those that include the removed vertices, then we say that \(G\) is an

**induced subgraph**. Finally, \(G'\) is a**spanning subgraph**of \(G\) if \(V' = V\), or, in other words, no vertices are removed from \(G\), only edges. **Section 9.1, exercise 9**: Solution to part b should end with "... is a cycle of length 6." (found by Shelbylynn McCoy)

Errata for V2.0----Errata for V3.0----Errata for V3.2