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Little Gauss
About this app
The sum 1+2+…+n as a staircase — a second staircase rotates in from above and completes the rectangle.
Subject: Visual proofs
More from Visual proofs
- Achilles and the Tortoise (Zeno)
- Banach–Tarski: 1 orange becomes 2
- Hilbert's Hotel
- Why √2 is not rational
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