Bijective sum!

Описание: This is a short, we explore the famous formula for the sum of the first n positive integers via a bijective technique.

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This proof comes from a compilation video showing 12 ways to prove this formula:    • A Dozen Proofs: Sum of Integers Formula (v...  

This animation is based a proof from Loren Larson's article in the last issue of the 1985 College Mathematics Journal : Loren C. Larson, A discrete look at 1 + 2 ++ n, The College Mathematics Journal 16 (1985), no. 5, 369–382 (https://doi.org/10.2307/2686996)

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