English-Catalan dictionary. 2013.
Pappus's hexagon theorem — (attributed to Pappus of Alexandria) states that given one set of collinear points A , B , C , and another set of collinear points a , b , c , then the intersection points x , y , z of line pairs Ab and aB , Ac and aC , Bc and bC are collinear. ( … Wikipedia
Flexagon — In geometry, flexagons are flat models made from folded strips of paper that can be folded, or flexed , to reveal a number of hidden faces. They are amusing toys but have also caught the interest of mathematicians.Flexagons are usually square or… … Wikipedia
Area of a disk — Part of a series of articles on the mathematical constant π … Wikipedia
Liu Hui's π algorithm — is a mathematical algorithm invented by Liu Hui (fl. 3rd century), a mathematician of Wei Kingdom. Before his time, the ratio of the circumference of a circle to diameter was often taken experimentally as 3 in China, while Zhang Heng (78… … Wikipedia
HSL and HSV — Fig. 1. HSL (a–d) and HSV (e–h). Above (a, e): cut away 3D models of each. Below: two dimensional plots showing two of a model’s three parameters at once, holding the other constant: cylindrical shells (b, f) of constant saturation, in this case… … Wikipedia
Turret lathe — Hartness 3x36 flat turret lathe with cross sliding head, equipped for bar work, 1910.[1] The turret lathe is a form of metalworking lathe that is used for repetitive production of duplicate parts, which by the nature of their cutting process are… … Wikipedia
Screw — This article is about the fastener. For other uses, see Screw (disambiguation). Screws come in a variety of shapes and sizes for different purposes. U.S. quarter coin (diameter 24 mm) shown for scale. A screw, or bolt, is a type of fastener… … Wikipedia
Glossary of graph theory — Graph theory is a growing area in mathematical research, and has a large specialized vocabulary. Some authors use the same word with different meanings. Some authors use different words to mean the same thing. This page attempts to keep up with… … Wikipedia
Schliff (Schmuckstein) — Als Schliff bezeichnet man in der Gemmologie die durch Schleifen erzeugte Art und Form von Schmucksteinen, um ihren Glanz zu verstärken und die dem Stein innewohnenden optischen Effekte hervorzuheben. Die Wahl des Schliffs sowie die Qualität der… … Deutsch Wikipedia
HSBC — Holdings plc Type Public limited company Traded as LSE: HS … Wikipedia
Desargues' theorem — Perspective triangles. Corresponding sides of the triangles, when extended, meet at points on a line called the axis of perspectivity. The lines which run through corresponding vertices on the triangles meet at a point called the center of… … Wikipedia
