Category:Undirected Graphs

This category contains results about Undirected Graphs.
Definitions specific to this category can be found in Definitions/Undirected Graphs.

An undirected graph is a graph whose edge set considered as a relation is symmetric.

That is, if $G$ is an undirected graph and $e = u v$ is an edge in $G$, then $v u$ is also an edge in $G$.

In other words, if you can "go from $u$ to $v$", you can also "go from $v$ to $u$".