# Graphs and paradoxes

A directed graph is a pair <N, E> where N is any collection or set of objects (the nodes of the graph) and E is a relation on N (the edges). Intuitively speaking, we can think of a directed graph in terms of a dot-and-arrow diagram, where the nodes are represented as dots, and the edges are represented as arrows. For example, in the following figure we have a graph that consists of three nodes–A, B, and C, and four edges: one from A to A, one from A to B, one from B to C, and one from Read more [...]