High Quality Content by WIKIPEDIA articles! The art of paper folding, or origami, has received a considerable amount of mathematical study. Fields of interest include a given paper model's flat-foldability (whether the model can be flattened without damaging it) and the use of paper folds to solve mathematical equations. The construction of origami models is sometimes shown as crease patterns. The major questions about such crease patterns are whether a crease pattern can be folded to a flat model, and deciding how to fold them is an NP-complete problem. Related problems when the creases are orthogonal are called map folding problems.

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