A Korean mathematician has solved one of geometry’s most stubborn puzzles, ending a problem that has challenged researchers for nearly 60 years and earning global recognition for a proof achieved ...

A Korean researcher who solved the “Moving Sofa Problem,” a mathematical challenge that had puzzled mathematicians for nearly 60 years, was selected as one of the top 10 mathematical innovations of ...

What is the largest sofa that you can squeeze around the corner of a hallway? A horseshoe-shaped piece of furniture known as Gerver’s sofa has officially taken the crown, solving a mathematical ...