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Otter's Theorem


In any tree, the number of dissimilar points minus the number of dissimilar lines plus the number of symmetry lines equals 1.


See also

Tree

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References

Harary, F. and Prins, G. "The Number of Homeomorphically Irreducible Trees, and Other Species." Acta Math. 101, 141-162, 1959.Otter, R. "The Number of Trees." Ann. Math. 49, 583-599, 1948.

Referenced on Wolfram|Alpha

Otter's Theorem

Cite this as:

Weisstein, Eric W. "Otter's Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OttersTheorem.html

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