S. Korean mathematician solves 6-decade math puzzle
Baek Jin-eon, a 31-year-old research fellow at the June E Huh Center for Mathematical Challenges at the Korea Institute for Advanced Study, is seen in this undated photo released by the institute on Jan. 5, 2026. Baek has solved the so-called moving sofa problem that had resisted proof for nearly six decades and asks how large a rigid shape can be while still being able to pass around a right-angled corner in an L-shaped corridor of a constant width of 1 meter. US magazine Scientific American named the research by Baek among its top 10 mathematical breakthroughs of 2025, the mathematics community said. (PHOTO NOT FOR SALE) (Yonhap)
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