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  2. Mathematics of paper folding - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_paper_folding

    The construction of origami models is sometimes shown as crease patterns. The major question about such crease patterns is whether a given crease pattern can be folded to a flat model, and if so, how to fold them; this is an NP-complete problem. [32] Related problems when the creases are orthogonal are called map folding problems.

  3. Napkin folding problem - Wikipedia

    en.wikipedia.org/wiki/Napkin_folding_problem

    The napkin folding problem is a problem in geometry and the mathematics of paper folding that explores whether folding a square or a rectangular napkin can increase its perimeter. The problem is known under several names, including the Margulis napkin problem, suggesting it is due to Grigory Margulis, and the Arnold's rouble problem referring ...

  4. Froebel star - Wikipedia

    en.wikipedia.org/wiki/Froebel_star

    Froebel stars as part of Christmas decoration. A Froebel star (‹See Tfd› German: Fröbelstern) is a Christmas decoration made of paper, common in Germany. [1] In English it does not have a commonly recognised name; it can be referred to as an Advent star, Danish star, German star, Nordic star, Pennsylvanian star, Polish star, Swedish star, Christmas star, or Froebel star. [2]

  5. Candlestick pattern - Wikipedia

    en.wikipedia.org/wiki/Candlestick_pattern

    A candlestick chart (also called Japanese candlestick chart or K-line[8]) is a style of financial chart used to describe price movements of a security, derivative, or currency. Stock price prediction based on K-line patterns is the essence of candlestick technical analysis. However, there are some disputes on whether the K-line patterns have ...

  6. Map folding - Wikipedia

    en.wikipedia.org/wiki/Map_folding

    In the mathematics of paper folding, map folding and stamp folding are two problems of counting the number of ways that a piece of paper can be folded. In the stamp folding problem, the paper is a strip of stamps with creases between them, and the folds must lie on the creases. In the map folding problem, the paper is a map, divided by creases ...

  7. Crochet - Wikipedia

    en.wikipedia.org/wiki/Crochet

    Crochet (English: / kroʊˈʃeɪ /; [1] French: [kʁɔʃɛ] [2]) is a process of creating textiles by using a crochet hook to interlock loops of yarn, thread, or strands of other materials. [3] The name is derived from the French term crochet, which means 'hook'. [4]

  8. Miura fold - Wikipedia

    en.wikipedia.org/wiki/Miura_fold

    The Miura fold (ミウラ折り, Miura-ori) is a method of folding a flat surface such as a sheet of paper into a smaller area. The fold is named for its inventor, Japanese astrophysicist Kōryō Miura. [1] The crease patterns of the Miura fold form a tessellation of the surface by parallelograms. In one direction, the creases lie along ...

  9. Yoshizawa–Randlett system - Wikipedia

    en.wikipedia.org/wiki/Yoshizawa–Randlett_system

    The Yoshizawa–Randlett system is a diagramming system used to describe the folds of origami models. Many origami books begin with a description of basic origami techniques which are used to construct the models. There are also a number of standard bases which are commonly used as a first step in construction. Models are typically classified ...

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