Inductive factorial sum visual proof @MathVisualProofs
Inductive factorial sum visual proof  @MathVisualProofs
Uploaded July 2024 | Updated September 2026, 2 weeks ago
This is a short, animated visual proof demonstrating a finite sum involving products of factorials. The proof exploits the classic inductive proof of the formula in question.

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This animation is based on a proofs by Tom Edgar from the December 2016 issue of Mathematics Magazine page 338 (doi.org/10.4169/math.mag.89.5.338).

If you want to see a longer version, with an accompanying explanation, check out youtu.be/FE0Vl4zm20I

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Inductive factorial sum visual proof

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