# The Pigeonhole Principle - Repunits

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In 1834, Johann Dirichlet noted that if there are five objects in four drawers then there is a drawer with two or more objects. The Schubfachprinzip, or drawer principle, got renamed as the pigeonhole principle, and became a powerful tool in mathematical proofs.

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Contributed by: Ed Pegg Jr (March 2011)

Open content licensed under CC BY-NC-SA

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"The Pigeonhole Principle - Repunits"

http://demonstrations.wolfram.com/ThePigeonholePrincipleRepunits/

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Published: March 7 2011