Richard Green

Contributing Writer

geometry

The Largest Sofa You Can Move Around a Corner

February 14, 2025

A new proof reveals the answer to the decades-old “moving sofa” problem. It highlights how even the simplest optimization problems can have counterintuitive answers.

About the author

Richard Green is a freelance mathematics writer and a professor of mathematics at the University of Colorado Boulder. He has a degree from the University of Oxford and a Ph.D. from the University of Warwick. You can find more of his writing at apieceofthepi.com.

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Richard Green

The Largest Sofa You Can Move Around a Corner

The Largest Sofa You Can Move Around a Corner

Richard Green

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The Largest Sofa You Can Move Around a Corner