Cauchy's Polygonal Number Theorem


 * A student asks,
 * Is there a short proof of Cauchy's Polygonal Number Theorem?


 * MathHelp replies,
 * Some googling turned up the references listed below.

External references

 * A Short Proof of Cauchy's Polygonal Number Theorem by Melvyn B. Nathanson, published in the Proceedings of the American Mathematical Society, Vol. 99, No. 1. (Jan., 1987), pp. 22-24.
 * A Short Proof of Cauchy's Polygonal Number Theorem (a mirror of the same article)