Definition:Circuit (Graph Theory)/Also defined as

Circuit (in the context of Graph Theory): Also defined as

Some sources specifically state that a circuit must have at least $3$ edges.

However, as defined on $\mathsf{Pr} \infty \mathsf{fWiki}$, this criterion emerges as a consequence of the definition.

Also see

• Circuit of Simple Graph has Three Edges or More

Sources

• 1977: Gary Chartrand: Introductory Graph Theory ... (previous) ... (next): $\S 2.3$: Connected Graphs