Korean mathematician Baek Jin-eon, 31, solves 60-year-old moving sofa problem after seven years of research; proves 2.2195 square meter curved shape is maximum size that can navigate L-shaped corridor's right-angle turn.

Six-decade math puzzle solved by Korean mathematician - The Korea Herald

Baek Jin-eon (Korea Institute for Advanced Study) A Korean mathematician has won international recognition for solving a geometry puzzle that had resisted proof for nearly six decades.US magazine Scientific American named the research by Baek Jin-eon among its top 10 mathematical breakthroughs of 2025, the mathematics community said on Sunday.Baek, 31, is a research fellow at the June E Huh Center for Mathematical Challenges at the Korea Institute for Advanced Study.The so-called moving sofa pr...