Assistant Professor KAMATA Tonan, Professor Erik D. Demaine, and Professor UEHARA Ryuhei of the Computing Science Research Area have proven that it is impossible to rearrange an equilateral triangle into a square using fewer than four pieces－a solution to a challenging mathematical puzzle that had remained unsolved for more than 120 years since it was first proposed in 1902.
This research achievement was featured as one of the "10 Biggest Math Breakthroughs of 2025" selected by the U.S. science magazine Scientific American.
A press release on this research was issued by JAIST in March 2025.

Scientific American
Posted on : December 19, 2025
Title : The 10 Biggest Math Breakthroughs of 2025
URL : https://www.scientificamerican.com/article/the-top-10-math-discoveries-of-2025/

Press release :
https://www.jaist.ac.jp/english/whatsnew/press/2025/03/11-1.html

Prof. Uehara

Asst. Prof. Kamata

January 7, 2026