The Record
Jun Maekawa
1958–
Cited on every fold as:
Maekawa, J. — mountain–valley countObserved that at any vertex which folds flat, the mountains and the valleys differ by exactly two. It is a counting rule, not a measuring one — and it is the second gate every fold on this site must pass.
Source: Maekawa's theorem: |M − V| = 2 at every flat-foldable vertex. Earlier statement of the same count: S. Murata, 1966. ↗