Quadratic
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In mathematics, the term quadratic describes something that pertains to squares, to the operation of squaring, to terms of the second degree, or equations or formulas that involve such terms. Quadratus is Latin for square.
[edit] Mathematics
[edit] 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
- 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
[edit] Calculus
- Quadratic approximation, a truncated Taylor series approximation
- Quadratic integral, the integral of the reciprocal of a second-degree polynomial
[edit] 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
[edit] 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
[edit] 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
[edit] 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
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