A closed trail is called a circuit when it is specified in cyclic order but no first vertex is explicitly identified.

See also

Graph Cycle, Trail, Walk

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West, D. B. Introduction to Graph Theory, 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, p. 27, 2000.

Cite this as:

Weisstein, Eric W. "Circuit." From MathWorld--A Wolfram Web Resource.

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