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 ...

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

Quantum calculations amount to sophisticated estimates. But in 1931, Hans Bethe intuited precisely how a chain of particles ...

Is the universe flat and infinite, or something more complex? We can’t say for sure, but a new search strategy is mapping out the subtle signals that could reveal if the universe has a shape.