# Graph theory – In my definition, this image is a closed tour? If so, how can I list the vertices? In this image, who is \$ v_1, v_2, … \$?

In my definition, is this a closed walk? If so, how can I list the vertices? In this photo, who is $$v_1, v_2, …$$?

Definition: A closed path in a graphic is defined as an ordered collection of vertices $$(v_1, v_2, …, v_n)$$ such that $$v_i$$ Y $$v_ {i + 1}$$ they are neighbors for all $$1 leq i leq n-1$$Y $$v_n$$ Y $$v_1$$ are neighbors Note that the walk can visit the same vertex or cross the same edge on more than one occasion.