Quadratic 239761 214033604 2008-05-21T21:04:39Z RussBot 279219 Robot-assisted fix [[WP:DPL|links to disambiguation page]] Square {{TOCright}} In mathematics, the term '''quadratic''' describes something that pertains to [[Square (algebra)|squares]], to the operation of [[squaring]], to terms of the second [[degree of a polynomial|degree]], or equations or formulas that involve such terms. '''''Quadratus''''' is [[Latin]] for ''square''. == Mathematics == === Algebra (elementary and abstract) === * [[Quadratic equation]], a polynomial ''equation'' of degree 2 and its roots * [[Quadratic function]], a polynomial ''function'' of degree 2 and its roots * [[Quadratic polynomial]], a polynomial (in possibly more than one variable) that contains terms of the second degree, whose coefficients are real or [[Complex quadratic polynomial | complex numbers]]. * [[Quadratic field]], a quadratic field is an algebraic number field K of degree two over Q * [[Quadratic irrational]] or "quadratic surd", an irrational number that is a root of a quadratic polynomial === Calculus === * [[Quadratic integral]], the integral of the reciprocal of a second-degree polynomial === Statistics and stochastics === * [[Quadratic form (statistics)]], scalar quantity ε'Λε for a n-dimensional square matrix * [[Quadratic mean]], the square root of the mean of the squares of the data * [[Quadratic variation]], in stochastics, useful for the analysis of Brownian motion and martingales === Number theory === * [[Quadratic reciprocity]], a theorem from number theory * [[Quadratic residue]], an integer that is a square modulo ''n'' * [[Quadratic sieve]], a modern integer factorization algorithm === Other=== * [[Quadratic convergence]], in which the distance to a convergent sequence's limit is squared at each step * [[Quadratic differential]], a form on a Riemann surface that locally looks like the square of an abelian differential * [[Quadratic form]], a homogeneous polynomial of degree two in a number of variables * [[Quadratic programming]], a special type of mathematical optimization problem. * [[Quadratic growth]], an asymptotic growth rate proportional to a quadratic function * [[Periodic points of complex quadratic mappings]], a type of graph that can be used to explore stability in control systems == Computer science == * [[Quadratic probing]], a scheme in computer programming for resolving collisions in hash tables. * [[Quadratic classifier]], used in machine learning to separate measurements of two or more classes of objects == Other == * [[Quadratic (Position)]], a sexual position. *[[Quadratic (collection)|''Quadratic'' (collection)]], a 1953 collection of science fiction novels by [[Olaf Stapledon]] and [[Murray Leinster]] {{mathdab}}