The Record
Toshikazu Kawasaki
1955–
Cited on every fold as:
Kawasaki, T. — flat-foldability conditionStated the condition that decides whether the creases meeting at a point can lie flat: go round the vertex and add every other angle; the answer must be a straight line. He reached it independently of Stuart Robertson and Jacques Justin, who reached it too — which is why it also carries Justin's name.
Source: Independent discovery with S. Robertson and J. Justin, late 1970s – early 1980s. Also called the Kawasaki–Justin theorem. Earlier general statement: S. Murata, 1966. ↗