In graph theory, the term "incidence" refers to the relationship between the edges and the vertices of a graph. Specifically, it describes how edges connect to vertices. In a graph: - A **vertex** is a point or a node. - An **edge** is a line connecting two vertices. There are a few important concepts associated with incidence in graphs: 1. **Incidence Relation**: An edge is said to be incident to the vertices it connects.
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The incidence graph of a set family is the bipartite graph whose two vertex classes are the family members and the ground points, with an edge for each containment relation.