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Islamic geometric patterns are derived from simpler designs used in earlier cultures: Greek, Roman, and Sasanian. They are one of three forms of Islamic decoration, the others being the arabesque based on curving and branching plant forms, and Islamic calligraphy; all three are frequently used together. [1] [2] From the 9th century onward, a ...
A tessellation or tiling is the covering of a surface, often a plane, using one or more geometric shapes, called tiles, with no overlaps and no gaps. In mathematics, tessellation can be generalized to higher dimensions and a variety of geometries. A periodic tiling has a repeating pattern. Some special kinds include regular tilings with regular ...
Nonagonal number. A nonagonal number, or an enneagonal number, is a figurate number that extends the concept of triangular and square numbers to the nonagon (a nine-sided polygon). [1] However, unlike the triangular and square numbers, the patterns involved in the construction of nonagonal numbers are not rotationally symmetrical.
A quilt is a multi-layered textile, traditionally composed of two or more layers of fabric or fiber. Commonly three layers are used with a filler material. These layers traditionally include a woven cloth top, a layer of batting or wadding, and a woven back combined using the techniques of quilting. This is the process of sewing on the face of ...
Quasicrystal. Potential energy surface for silver depositing on an aluminium – palladium – manganese (Al–Pd–Mn) quasicrystal surface. Similar to Fig. 6 in Ref. [1] A quasiperiodic crystal, or quasicrystal, is a structure that is ordered but not periodic. A quasicrystalline pattern can continuously fill all available space, but it lacks ...
Quilting became a favoured activity of the Anabaptist sect after emigrating to the United States and Canada from Germany and Switzerland over 250 years ago. The earliest known Amish quilts, dating from 1849, are whole-cloth works in solid colours. Pattern-pieced bed coverings didn't appear until the 1870s.
The Oakland Athletics placed Miller on the 15-day injured list Thursday due to a fractured pinky finger on his left hand. The broken finger is on his non-pitching hand, and the A's put Miller on ...
Octagonal number. An octagonal number is a figurate number that gives the number of points in a certain octagonal arrangement. The octagonal number for n is given by the formula 3 n2 − 2 n, with n > 0. The first few octagonal numbers are. 1, 8, 21, 40, 65, 96, 133, 176, 225, 280, 341, 408, 481, 560, 645, 736, 833, 936 (sequence A000567 in the ...
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