Skew may refer to:
In mathematics
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Skew lines
In three-dimensional geometry, skew lines are two Line (geometry), lines that do not Line-line intersection, intersect and are not Parallel (geometry), parallel. A simple example of a pair of skew lines is the pair of lines through opposite edges ...
, neither parallel nor intersecting.
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Skew normal distribution
In probability theory and statistics, the skew normal distribution is a continuous probability distribution that generalises the normal distribution to allow for non-zero skewness.
Definition
Let \phi(x) denote the Normal distribution, standard ...
, a probability distribution
* Skew field or
division ring
In algebra, a division ring, also called a skew field (or, occasionally, a sfield), is a nontrivial ring in which division by nonzero elements is defined. Specifically, it is a nontrivial ring in which every nonzero element has a multiplicativ ...
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Skew-Hermitian matrix
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In linear algebra, a square matrix with complex entries is said to be skew-Hermitian or anti-Hermitian if its conjugate transpose is the negative of the original matrix. That is, the matrix A is skew-Hermitian if it satisfies the relation ...
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Skew lattice In abstract algebra, a skew lattice is an algebraic structure that is a non-commutative generalization of a lattice (order), lattice. While the term ''skew lattice'' can be used to refer to any non-commutative generalization of a lattice, since 1989 ...
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Skew polygon
In geometry, a skew polygon is a closed polygonal chain in Euclidean space. It is a figure (geometry), figure similar to a polygon except its Vertex (geometry), vertices are not all coplanarity, coplanar. While a polygon is ordinarily defined a ...
, whose vertices do not lie on a plane
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Infinite skew polyhedron
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Skew-symmetric graph
In graph theory, a branch of mathematics, a skew-symmetric graph is a directed graph that is graph isomorphism, isomorphic to its own transpose graph, the graph formed by reversing all of its edges, under an isomorphism that is an involution (math ...
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Skew-symmetric matrix
In mathematics, particularly in linear algebra, a skew-symmetric (or antisymmetric or antimetric) matrix is a square matrix whose transpose equals its negative. That is, it satisfies the condition
In terms of the entries of the matrix, if a ...
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Skew tableau, a generalization of Young tableaux
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Skewness
In probability theory and statistics, skewness is a measure of the asymmetry of the probability distribution of a real-valued random variable about its mean. The skewness value can be positive, zero, negative, or undefined.
For a unimodal ...
, a measure of the asymmetry of a probability distribution
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Shear mapping
In plane geometry, a shear mapping is an affine transformation that displaces each point in a fixed direction by an amount proportional to its signed distance function, signed distance from a given straight line, line parallel (geometry), paral ...
In science and technology
*Skew, also synclinal or gauche in
alkane stereochemistry
*Skew
ray (optics)
In optics, a ray is an idealized geometrical model of light or other electromagnetic radiation, obtained by choosing a curve that is perpendicular to the ''wavefronts'' of the actual light, and that points in the direction of energy flow. Rays ...
, an optical path not in a plane of symmetry
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Skew arch
A skew arch (also known as an oblique arch) is a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle. This results in the faces of the arch not being perpendicular to its abutments and it ...
, not at a right angle
In computing
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Clock skew
Clock skew (sometimes called timing skew) is a phenomenon in synchronous digital circuit systems (such as computer systems) in which the same sourced clock signal arrives at different components at different times due to gate or, in more advanc ...
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Transitive data skew, an issue of data synchronization
In telecommunications
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Skew (fax)
In fax systems, skew is the angular deviation of the received frame from rectangularity caused by asynchronism between the Image scanner, scanner and the recorder. This is the same as the angle between the scanning line, or recording line, and the ...
, unstraightness
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Skew (antenna) a method to improve the horizontal radiation pattern
Other uses
* Volatility skew, in finance, a downward-sloping
volatility smile
Volatility smiles are implied volatility patterns that arise in pricing financial options. It is a parameter (implied volatility) that is needed to be modified for the Black–Scholes formula to fit market prices. In particular for a given ex ...
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SKEW, the ticker symbol for the CBOE Skew Index
See also
* SKU or
Stock-keeping unit
In inventory management, a stock keeping unit (abbreviated as SKU, pronounced or ) is the unit of measure in which the stocks of a material are managed. It is a distinct type of item for sale, purchase, or tracking in inventory, such as a produ ...
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