Six-decade math puzzle solved by Korean mathematician
SMRTR summary
Korean mathematician Baek Jin-eon solved the 58-year-old "moving sofa problem" that asks what's the largest rigid shape that can navigate around a right-angled corner in a corridor. After seven years of research, the 31-year-old proved that a curved design proposed in 1992 with an area of 2.2195 square meters represents the absolute upper limit. His breakthrough earned recognition as one of Scientific American's top 10 mathematical achievements of 2025.
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