Let G be an undirected graph 〈V, E〉, where V is a set ofvertexes, and E is a set of edges. A path through G is an orderedfinite sequence of vertexes in G.V that looks like this:
s, v1, v2 …, vn, f
The vertex s is called the path’s start vertex, and the vertex fcalled its finish vertex. There may be zero or more vertexesbetween s and f in the path. The path exists if and only if G.Econtains the edge (s, f), or if G.E contains the following edgeswhere n ≥ 1.
(s, v1), (v1, v2) …, (vn−1, vn), (vn, f).
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