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Tetrakis Hexahedron Stereographic D2 Gyrations
Tetrakis may refer to: *Tetrakis (Paphlagonia), an ancient Greek city *Tetrakis cuboctahedron, convex polyhedron with 32 triangular faces *Tetrakis hexahedron, an Archimedean dual solid or a Catalan solid *Tetrakis square tiling, a tiling of the Euclidean plane *Tetrakis(triphenylphosphine)palladium(0), a catalyst in organic chemistry See also *Tetracus *Tetrakis legomenon, a word that occurs only four times within a context *Tetricus (other) *Tetrix (other) *Truncated tetrakis cube, a convex polyhedron with 32 faces * {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrakis (Paphlagonia)
Tetrakis () was a ancient Greece, Greek town of ancient Paphlagonia on the Black Sea coast.''Periplus of Pseudo-Scylax'' Its site is unlocated but based on the position it occupies in the text of the ''Periplus of Pseudo-Scylax'', it would be west of Sinop, Turkey, Sinope. Its site is unlocated. References Populated places in ancient Paphlagonia Former populated places in Turkey Lost ancient cities and towns {{ancientPaphlagonia-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrakis Cuboctahedron
In geometry, the tetrakis cuboctahedron is a convex polyhedron with 32 triangular faces, 48 edges, and 18 vertices. It is a dual of the truncated rhombic dodecahedron. Its name comes from a topological construction from the cuboctahedron with the kis operator applied to the square faces. In this construction, all the vertices are assumed to be the same distance from the center, while in general octahedral symmetry can be maintain even with the 6 order-4 vertices at a different distance from the center as the other 12. Related polyhedra It can also be topologically constructed from the octahedron, dividing each triangular face into 4 triangles by adding mid-edge vertices (an ortho operation). From this construction, all 32 triangles will be equilateral. This polyhedron can be confused with a slightly smaller Catalan solid, the tetrakis hexahedron, which has only 24 triangles, 32 edges, and 14 vertices. File:Tetrakis cuboctahedron on octahedron.png, Octahedron with edg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrakis Hexahedron
In geometry, a tetrakis hexahedron (also known as a tetrahexahedron, hextetrahedron, tetrakis cube, and kiscube) is a Catalan solid. Its dual is the truncated octahedron, an Archimedean solid. It can be called a disdyakis hexahedron or hexakis tetrahedron as the dual of an omnitruncated tetrahedron, and as the barycentric subdivision of a tetrahedron. As a Kleetope The name "tetrakis" is used for the Kleetopes of polyhedra with square faces. Hence, the tetrakis hexahedron can be considered as a cube with square pyramids covering each square face, the Kleetope of the cube. The resulting construction can be either convex or non-convex, depending on the square pyramids' height. For the convex result, it comprises twenty-four isosceles triangles. A non-convex form of this shape, with equilateral triangle faces, has the same surface geometry as the regular octahedron, and a paper octahedron model can be re-folded into this shape. This form of the tetrakis hexahedron was illustr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrakis Square Tiling
In geometry, the tetrakis square tiling is a tiling of the Euclidean plane. It is a square tiling with each square divided into four isosceles right triangles from the center point, forming an infinite arrangement of lines. It can also be formed by subdividing each square of a grid into two triangles by a diagonal, with the diagonals alternating in direction, or by overlaying two square grids, one rotated by 45 degrees from the other and scaled by a factor of √2. Conway, Burgiel, and Goodman-Strauss call it a kisquadrille, represented by a kis operation that adds a center point and triangles to replace the faces of a square tiling (quadrille). It is also called the Union Jack lattice because of the resemblance to the UK flag of the triangles surrounding its degree-8 vertices. It is labeled V4.8.8 because each isosceles triangle face has two types of vertices: one with 4 triangles, and two with 8 triangles. As a dual uniform tiling It is the dual tessellation of the tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrakis(triphenylphosphine)palladium(0)
Tetrakis(triphenylphosphine)palladium(0) (sometimes called quatrotriphenylphosphine palladium) is the chemical compound d(P(C6H5)3)4 often abbreviated Pd( PPh3)4, or rarely PdP4. It is a bright yellow crystalline solid that becomes brown upon decomposition in air. Structure and properties The four phosphorus atoms are at the corners of a tetrahedron surrounding the palladium(0) center. This structure is typical for four-coordinate 18 e− complexes. The corresponding complexes Ni(PPh3)4 and Pt(PPh3)4 are also well known. Such complexes reversibly dissociate PPh3 ligands in solution, so reactions attributed to Pd(PPh3)4 often in fact arise from Pd(PPh3)3 or even Pd(PPh3)2. Preparation Tetrakis(triphenylphosphine)palladium(0) was first prepared by Lamberto Malatesta et al. in the 1950s by reduction of sodium chloropalladate with hydrazine in the presence of the phosphine. It is commercially available, but can be prepared in two steps from Pd(II) precursors: :PdCl2 + 2 PPh3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetracus
''Tetracus'' is an extinct genus of gymnures. Species are from the Oligocene of Belgium and France. Fossils can also be found in the Bouldnor Formation in the Hampshire Basin of southern England. Species: * †''Tetracus nanus'' (Aymard, 1846) ** synonym ''Erinaceus nanus'' Aymard, 1846 ** synonym ''Camphotherium elegans'' Filhol, 1883, Filhol, 1884Observations relatives au Mémoire de M. Cope, intitulé: Relations des Horizons renfermant des débris d'Animaux vertébrés fossiles en Europe et en Amérique. H Filhol, 1884 ** synonym ''Comphotherium elegans'' Filhol, 1884, Filhol 1885 ** synonym ''Gomphotherium ''Gomphotherium'' (; "nail beast" for its double set of straight tusks) is an extinct genus of gomphothere proboscidean from the Neogene of Eurasia, Africa and North America. It is the most diverse genus of gompothere, with over a dozen valid sp ... elegans'' Filhol, 1884 in Schlosser, 1887, p. 140 and 465 and in Lavocat, 1951, p. 14 ** synonym '' Neurogymnur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrakis Legomenon
In corpus linguistics, a ''hapax legomenon'' ( also or ; ''hapax legomena''; sometimes abbreviated to ''hapax'', plural ''hapaxes'') is a word or an expression that occurs only once within a context: either in the written record of an entire language, in the works of an author, or in a single text. The term is sometimes incorrectly used to describe a word that occurs in just one of an author's works but more than once in that particular work. ''Hapax legomenon'' is a transliteration of Greek , meaning "said once". The related terms ''dis legomenon'', ''tris legomenon'', and ''tetrakis legomenon'' respectively (, , ) refer to double, triple, or quadruple occurrences, but are far less commonly used. ''Hapax legomena'' are quite common, as predicted by Zipf's law, which states that the frequency of any word in a corpus is inversely proportional to its rank in the frequency table. For large corpora, about 40% to 60% of the words are ''hapax legomena'', and another 10% to 15% are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetricus (other) , was his co-ruler
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Tetricus may refer to: * Tetricus I, emperor of the Gallic Empire (Imperium Galliarum) was the last of the Gallic Emperors as Tetricus I from 270/271 to 273. * his son, Tetricus II Gaius Pius Esuvius Tetricus, better known as Tetricus II, was the son and heir of Tetricus I, emperor of the Gallic Empire from 271 to 274 AD. In 273, he was given the title of ''Caesar'' alongside that of '' princeps iuventutis'', and in Janua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrix (other)
Tetrix may refer to: * Tetrix (band), a Canadian rock/improv band * ''Tetrix'' (insect), a genus of insects in the family Tetrigidae called ground-hoppers * Tetrix Robotics Kit, an educational robotics kit * 8598 Tetrix, a main-belt asteroid * A three-dimensional analog of the Sierpiński triangle The Sierpiński triangle, also called the Sierpiński gasket or Sierpiński sieve, is a fractal with the overall shape of an equilateral triangle, subdivided recursion, recursively into smaller equilateral triangles. Originally constructed as a ... * The name of some clones of the video game ''Tetris'' {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
