Quadratic
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Robot-assisted fix [[WP:DPL|links to disambiguation page]] Square
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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]]
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