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Maekawa's theorem is a theorem in the mathematics of paper folding named after Jun Maekawa. It relates to flat-foldable origami crease patterns and states that at every vertex, the numbers of valley and mountain folds always differ by two in either direction. [1] The same result was also discovered by Jacques Justin [2] and, even earlier, by S ...
There are two traditional methods for making polyhedra out of paper: polyhedral nets and modular origami.In the net method, the faces of the polyhedron are placed to form an irregular shape on a flat sheet of paper, with some of these faces connected to each other within this shape; it is cut out and folded into the shape of the polyhedron, and the remaining pairs of faces are attached together.
Crease pattern for a Miura fold. The parallelograms of this example have 84° and 96° angles. The Miura fold is a rigid fold that has been used to pack large solar panel arrays for space satellites, which have to be folded before deployment. Robert J. Lang has applied rigid origami to the problem of folding a space telescope. [7]
The Miura fold is a form of rigid origami, meaning that the fold can be carried out by a continuous motion in which, at each step, each parallelogram is completely flat. This property allows it to be used to fold surfaces made of rigid materials, making it distinct from the Kresling fold and Yoshimura fold which cannot be rigidly folded and ...
The Huzita–Justin axioms or Huzita–Hatori axioms are a set of rules related to the mathematical principles of origami, describing the operations that can be made when folding a piece of paper. The axioms assume that the operations are completed on a plane (i.e. a perfect piece of paper), and that all folds are linear.
Origami cranes The folding of an Origami crane A group of Japanese schoolchildren dedicate their contribution of Thousand origami cranes at the Sadako Sasaki memorial in Hiroshima. Origami ( 折り紙 , Japanese pronunciation: [oɾiɡami] or [oɾiꜜɡami] , from ori meaning "folding", and kami meaning "paper" ( kami changes to gami due to ...
This category is for origami, the Japanese art of paper folding. Other paper folding arts and mathematical aspects of paper folding are in Category:Paper folding . Subcategories
Martin Gardner included this fold, described as both a bug catcher and fortune-teller, in a column in Hugard's Magic Monthly, titled "Encyclopedia of Impromptu Magic", in the 1950s. [22] Although the phrase "cootie catcher" has been used with other meanings in the U.S. for much longer, [ 23 ] the use of the phrase for paper cootie catchers in ...