Graph (discrete mathematics)
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In discrete mathematics, particularly in graph theory, a graph is a structure consisting of a set of objects where some pairs of the objects are in some sense "related". The objects are represented by
A mixed graph with three vertices, two directed edges, and an undirected edge
Connectivity (graph theory)
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In mathematics and computer science, connectivity is one of the basic concepts of graph theory: it asks for the minimum number of elements that need to be removed to separate the remaining nodes into
Graph (discrete mathematics)
…it is a cycle or circuit in that graph. A tree is an undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. A forest is an undirected graph in which any two vertices are connected by at most one path, or equivalently an acyclic…
This graph becomes disconnected when the dashed edge is removed.