Dumbbell graph
= Dumbbell graph
{wiki}
A dumbbell graph consists of two cycles joined by a path. Its connecting path contains bridges, unlike a <Theta graph>, although both the two-loop dumbbell and $\Theta_3$ have first homology $\mathbb Z^2$.
= Dumbbell graph
{wiki}
A dumbbell graph consists of two cycles joined by a path. Its connecting path contains bridges, unlike a <Theta graph>, although both the two-loop dumbbell and $\Theta_3$ have first homology $\mathbb Z^2$.