Erlebnisland Mathematik | Technische Sammlungen Dresden | Junghansstraße 1-3 | 01277 Dresden
Erlebnisland Mathematik

Proofs without words: Sum of n

A “proof without words” convincingly justifies a mathematical claim just by picture.

Here it is shown that $latex 1 + 2 + \dots + n$ is equal to $latex \frac{1}{2}n(n+1)$.

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beweis-summe-n