Jun Maekawa Origami File
: At any vertex where crease lines meet in a flat-foldable origami model, the difference between the number of mountain folds ( ) and valley folds ( ) is always ±2plus or minus 2 . Mathematically, this is expressed as:
: At any vertex where crease lines meet in a flat-foldable origami model, the difference between the number of mountain folds ( ) and valley folds ( ) is always ±2plus or minus 2 . Mathematically, this is expressed as: