Proof clarifies a map-folding problem.

Focuses on the research of Erik Demaine and coworkers at the University of Waterloo in Ontario on a method for recognizing when a creased sheet is foldable into a flat package. Details of his study with one- and two-dimensional cases of the folding problem; Interest of mathematicians in ways to systemize origami design to enable computers to calculate what sequence of creases in a square of paper will produce a desired figure.