Skew
Encyclopedia
Skew may refer to:
In mathematics:
In statistics:
In chemistry
In optics:
In engineering:
In finance:
In telecommunications:
In computers:
In aviate:
In fantasy baseball:
In mathematics:
- Skew linesSkew linesIn solid geometry, skew lines are two lines that do not intersect and are not parallel. Equivalently, they are lines that are not coplanar. A simple example of a pair of skew lines is the pair of lines through opposite edges of a regular tetrahedron...
, lines that are neither parallel nor intersecting - Skew-symmetric matrixSkew-symmetric matrixIn mathematics, and in particular linear algebra, a skew-symmetric matrix is a square matrix A whose transpose is also its negative; that is, it satisfies the equation If the entry in the and is aij, i.e...
, a square matrix whose transpose is also its negative - Skew-Hermitian matrixSkew-Hermitian matrixIn linear algebra, a square matrix with complex entries is said to be skew-Hermitian or antihermitian if its conjugate transpose is equal to its negative. That is, the matrix A is skew-Hermitian if it satisfies the relationA^\dagger = -A,\;...
, a complex square matrix whose conjugate transpose is also its negative - Infinite skew polyhedronInfinite skew polyhedronIn geometry, an infinite skew polyhedron is an extension of the idea of a polyhedron, consisting of regular polygon faces with nonplanar vertex figures, allowing the figure to extend indefinitely without folding round to form a closed surface....
, an extension of the concept of polyhedra - Skew-symmetric graphSkew-symmetric graphIn graph theory, a branch of mathematics, a skew-symmetric graph is a directed graph that is isomorphic to its own transpose graph, the graph formed by reversing all of its edges. The isomorphism is required to be an involution without any fixed points....
, a directed graph that is isomorphic to its own transpose graph - Skew polygonSkew polygonIn geometry, a skew polygon is a polygon whose vertices do not lie in a plane. Skew polygons must have at least 4 vertices.A regular skew polygon is a skew polygon with equal edge lengths and which is vertex-transitive....
, a polygon whose vertices do not lie on a plane - Skew latticeSkew latticeIn abstract algebra, a skew lattice is an algebraic structure that is a non-commutative generalization of a lattice. While the term skew lattice can be used to refer to any non-commutative generalization of a lattice, over the past twenty years it has been used primarily as follows.-Definition:A...
, a non-commutative generalization of a lattice - Skew field or division ringDivision ringIn abstract algebra, a division ring, also called a skew field, is a ring in which division is possible. Specifically, it is a non-trivial ring in which every non-zero element a has a multiplicative inverse, i.e., an element x with...
, a (non-commutative) ring in which division is possible - Skew tableau, a generalization of Young tableau
- The shear mapping, a particular type of linear transformation
In statistics:
- SkewnessSkewnessIn probability theory and statistics, skewness is a measure of the asymmetry of the probability distribution of a real-valued random variable. The skewness value can be positive or negative, or even undefined...
, a measure of the asymmetry of a probability distribution - Skew normal distribution, a continuous probability distribution that generalises the normal distribution to allow for non-zero skewness
In chemistry
- Skew (also synclinal or gauche), a torsion angle between 30° to 90° and –30° to –90°; see Alkane stereochemistryAlkane stereochemistryAlkane stereochemistry concerns the stereochemistry of alkanes.Alkane conformers are one of the subjects of alkane stereochemistry.-Conformations:...
In optics:
- A skew rayRay (optics)In optics, a ray is an idealized narrow beam of light. Rays are used to model the propagation of light through an optical system, by dividing the real light field up into discrete rays that can be computationally propagated through the system by the techniques of ray tracing. This allows even very...
, an optical path through a rotationally symmetric optical system that is not in a plane of symmetry
In engineering:
- A skew archSkew archA skew 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 its plan view being a parallelogram, rather than the rectangle that is the plan view of...
, a method of construction that enables an arch bridge to span an obstacle at some angle other than a right angle
In finance:
- Volatility skew, a downward-sloping volatility smileVolatility SmileIn finance, the volatility smile is a long-observed pattern in which at-the-money options tend to have lower implied volatilities than in- or out-of-the-money options. The pattern displays different characteristics for different markets and results from the probability of extreme moves...
In telecommunications:
- Skew (fax)Skew (fax)In fax systems, skew is the angular deviation of the received frame from rectangularity caused by asynchronism between the scanner and the recorder...
, the angular deviation of the received frame from rectangularity - In parallel communication, the difference in arrival time of simultaneously transmitted bits
- For data recorded on multichannel magnetic tapeMagnetic tapeMagnetic tape is a medium for magnetic recording, made of a thin magnetizable coating on a long, narrow strip of plastic. It was developed in Germany, based on magnetic wire recording. Devices that record and play back audio and video using magnetic tape are tape recorders and video tape recorders...
, the difference between reading times of bits recorded in a single transverse line. Skew is usually interpreted to mean the difference in reading times between bits recorded on the tracks at the extremities, or edges, of the tape. - Skew (antenna)Skew (antenna)Skew is a term used in antenna engineering. It is a technique to improve the horizontal radiation pattern of a high power transmitter station.In a high power VHF or UHF station, usually the antenna system is constructed to broadcast to four directions each separated 90° from each other. So the...
a method to improve the horizontal radiation pattern
In computers:
- Clock skewClock skew-In circuit design:In circuit designs, clock skew is a phenomenon in synchronous circuits in which the clock signal arrives at different components at different times...
, a phenomenon in which the clock signal arrives at different components at different times. - In reference to computer disk drives, track-to-track skew is the angle between the start of the data on a given track and the start of the data on the next. This is important, as when reading the data in sequence from one track to the next, time must be allowed for the read/write head to move to the next track, during which the disk continues to rotate. Insufficient skew can force the drive to wait almost an entire revolution for the data to pass under the head again, resulting in extra revolutions per track to read the data. Excessive skew can also lower the sustained data transfer rate.
- Transitive data skewTransitive data skewTransitive data skew is the uneven distribution of otherwise evenly distributed data across a number of devices while the data is in transition. If sorted data is being distributed across multiple devices and the column on which that data is sorted is the 'key' used to identify the target device,...
In aviate:
- Skew flip turnoverSkew flip turnoverA skew flip turnover is a maneuver in which an aircraft or spacecraft accelerates to a certain point, flips over and begins to accelerate in the opposite direction...
, an aircraft maneuver
In fantasy baseball:
- SKEW, a strategy that focuses on high impact middle relievers that register a lot of strikeouts